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JSB Diabolo Exact King Heavy MKII .25 Cal, 33.95 gr - 300 ct

JSB Diabolo Exact King Heavy MKII .25 Cal, 33.95 gr - 300 ct

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  • List Price $19.99
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  • Code: 546498-300 · 0.25 cal · · 300 ct
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MkII pellet has a skirt diameter that is only 6.5mm- making the pellet work a little more reliably in some rotary magazines.

  • .25 caliber
  • 33.95 grains
  • Round nose
  • 300 pellets

Warning: Important information for California residents
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  • ManufacturerJSB
  • Caliber0.25 cal
  • Pellet Quantity300
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JSB Diabolo Exact King Heavy MKII .25 Cal, 33.95 gr - 300 ct
43 Reviews
95% (41)
5% (2)
0% (0)
0% (0)
0% (0)
100% Recommend this product (43 of 43 responses)
By Jose L.
El Salvador
Jsb MKII are the best
November 21, 2019
Very well packaged and protected so they can keep their shape an extremly good accuracy
ProsAccuracy, design, good bc
Best UsesHunting, hunting and hunting
By Mark S.
Left Coast, FL.
The Best
July 20, 2019
My at44 long loves these things. Very accurate and consistent and better in the wind than the 25 grainers. Impact on small to medium game is unreal.
ProsBest hunting pellet l've found.
ConsNone, could be a little cheaper.
Best UsesHunting / target
By killemdead A.
Hard hittin pellets..
May 2, 2019
Shots great out of my edgun R5M Matador Standard...super tight group at 65 yards
By Pete
JSB King Heavy MKII 33.95
March 15, 2019
I have not been able to shoot passed 30m with these yet but I am looking forward to it. At 30m these might be even more accurate out of my FX Impact than the King 25s.
ProsSuper accurate and hard hitting out of FX Impact.
ConsA little tight going into Impact magazines.
Best UsesShooting passed 30m
By Dave
Lake Tahoe
Accurate but a little slow
January 3, 2019
This pellets are very accurate out of my Marauder, but they are pretty slow. I am hoping to tune my rifle, change out the valve and springs, and set my rifle up for this pellet, but a bit faster than stock.
ProsGreat down range energy and very accurate. Pretty good for a pellet in the wind.
ConsMy stock Marauder doesn't have the juice to make these hit with authority.
By Jon
Heavy 25 JSB
December 5, 2018
Excellent heavy 25 caliber powerhouse of a round - very accurate for hunting and possibly target
ProsHeavy - accurate - consistent
Cons Was going to use the 33s for competition until I saw how consistent these guys did against the 25.39s WOW!And very consistent
Best Uses Hunting and target
By Michael
Muskegon, Mi
Well balanced
November 27, 2018
Very nice round and they seem to fly true.
Proswell balanced
Best Usestarget and small game
By Steve
Syracuse ny
Jsb diablos heavy
November 24, 2018
These have been very accurate in my Hastan bull boss good grouping as well as good distance these will go clean through a piece of 3/4 in plywood
By Bio
JSB pellets top of the food chain. 33gr rule
November 7, 2018
The 33gr pellets are slightly more accurate and better in the wind than the 25gr at ranges above 50 yards in my .25 Fx Impact and the same with the x barrel. The 33gr will often, near 30% of the time, print a 1 inch 5 shot group at 100 yards. I used to check the head size of each pellet but after checking several tins found it to be so consistent that I no longer do so. I do still sort by defect and weight. Weights are mostly within .05gr and I find only a couple out of a 350 tin have slightly damaged skirts. I relegate about 15% of each tin to the practice rounds tin for minor defects that I think may affect accuracy at longer ranges. In my opinion these are one of the best if not the best on the market. The usually fit in the magazine but a slight mod to the mag will make them drop in 100% of the time.
ProsLong range accuracy
ConsA few are tight in Fx Impact magazines.
Best UsesTarget, Hunting, Plinking
By Marc
Great Service
November 5, 2018

Great pellet,with good accuracy and performance. This batch of pellets had about a 3 grain spread. So, for hunting purposes no big deal...However, sorting will be necessary for accurate target shooting or to ascess groups for your gun barrel...
Prosquality pellet
ConsWeight/grn inconsistency...
By anthony
October 12, 2018
Ordered some of these baby"s and came in the best packaging i have seen. These boys r always the best pellets in the market, whether in groups r hunting small game these r the boys.
By Anthony
Riverside, CA
JSB Diabolo Exact King Heavy MKII .25 Cal 33.95 gr
October 12, 2018
So far excellent pellet for my Benjamin Marauder .25 cal.
By Josh P.
Great ammo
September 14, 2018
Awesome ammo
By John
Dewitt, AR
JSB MkII 25 cal 33.95gr
August 21, 2018
These pellets are the "heavy hitters" for the 25 cal PCPs. My Fx Crown set at 145 BAR on the rifle regulator and #5 on the hammer power will drive them through the CED chronograph at 875 fps. When you plug the data into the Hawke ChairGun program those results are what you actually see down range. This pellets fit into the magazine, with a very close fit. The Sd out of my rifle, at these settings, is 2.1. I did not ever use the original version of this pellet but this new design is an outstanding performer. The attached pic is a 5 shot group at 100 yds with a 5 mph cross wind, 3/4 MOA!
ProsExceptional accuracy and amazing wind bucking performance from a diabolo style pellet
ConsScrew top tin would be perfection, in use!
Best UsesLong range shooting and large vermin elimination
By Logan
Aberdeen, SD
July 22, 2018
This is the only pellet for my impact... unreal accuracy shot after shot
ProsUnmatched accuracy
Best UsesHunting small game
By gabriel
New England
Tough pellets
July 16, 2018
Hits hard and flies straight for my Benjamin break barrel. The ammo comes very uniform and I feel confident it will hit my target. Iā€™ve used the Barracuda and Benjamin pellets these are the best so far.
ProsComes in 350 which is great, good solid weight, accurate, good quality almost all the pellets are perfect shape.
Best UsesTarget practice and squirrels
July 15, 2018
By Joe P.
4 out of 5 airguns agree
July 12, 2018
I'm one of those guys that owns several hundred tins of pellets. Many of those I've owned for years. None of those that I've owned for over a month are JSB Diabolos. Why? Because they get used. It's what the greatest majority of my airguns prefer. At my place, airgun brands come and go but the JSBs are ever present not because I have any affinity for the brand, but because most airguns DO.
By Sid
Super Accurate Pellet!
June 16, 2018
Finally had the opportunity to try this pellet in my BT65 and discovered it was even more accurate than the 25.4 gr. Kings! Shoots one ragged hole at 50 yds. and hits very hard.
ProsAccurate and lots of energy down range.
ConsSells out fast.
By Mark S.
Chesterfield Va.
great pellets
June 10, 2018
I use them in a FX Impact and out to 50 yds couldn't be much more accurate or hit much harder love them!!!!!
Prosshoot great in my Impact
Best Usessmall game & targets
By Roger
Sandy, UT
JSB .25 Cal 34g Pellets
June 6, 2018
These pellets shoot very well in my FX Crown.

I weigh all of my pellets, sorting them in to groups of 0.3 grain spread. They are very consistent! About 285 will go into the main group, 15 or so in the upper/lower group. I very rarely have any pellets with weights that are extreme.

Very good product, and the ''buy 4, get one free'' doesn't hurt either.
ProsVery accurate! Wish they had 'bulk' tins of these pellets.
By Joel W.
Great pellets
June 6, 2018
If you don't already know. These are one of the best pellets out. Most people who know what they're doing use JSB and that's because they know what they're doing lol. I strictly buy JSB. These live up to their rep.
By Steven j.
, south Florida
The best pellets
March 7, 2018
By far the best pellets for my Hatsan By 65 .25
Easy nickel size groups at 125 feet
ConsNeeds screw lid on can
Best UsesHunting Plinging
By Glen
Honolulu, HI
Great Pellet
February 25, 2018
I shoot these JSB Heavies out of my power tuned Cricket .25. Super accurate and hard hitting! Shoot great out my Condor SS 0.25 too. Same results!
ProsHits Hard Accurate
By David F.
Great place to get pellets
February 15, 2018
I bought 4 tins of pellets and got the cheapest one free,I ordered on Wednesday and had them in Alaska on Friday,shipping price was real reasonable and they where packaged very good,cardboard box with foam that had cut outs for the pellet tins. best place to get pellets that Ive seen. Will be buying from them again.
By Rick P.
Hard hitting
February 5, 2018
They are a little different flight trajectory but when they arrive they do it with authority. Devastating for a 25 cal. And very accurate. Only complaint is I don't have an endless supply.
By Stan
mk11 .25 heavy
November 7, 2017
I shot these and the regular heavies at 40 yrds with my marauder to see which would do better in my gun. They both shot the same half inch groups to the same point of aim. The lighter 25 gr. version shoot just a hair better out of my gun.
Prosconsistent, accurate, great quality
By Gerry
Encinitas, CA
My .25, BT65 LOVES these!!!
September 2, 2017
I have 5 properties where I hunt ground squirrels. My BT65 .25 is very accurate and hard hitting but those "squeaks" are tough little guys. When they get hit by the Mark II's they go DOWN! End of story. These pellets add another dimension of accuracy to an already accurate gun. H&N Hunter Extreme, great. Predator Polymags, great but these are the absolute go-to pellet for this gun. I love 'em.
ProsAccurate, hard hitting, buck the wind. Sound of them impacting illustrates a SOLID hit. Clean and uniform. Tight fit in barrel.
ConsContainers need a screw top lid, small sacrifice to make if you want a great pellet.
By Jacques
Modesto, CA
Great pellet
August 12, 2017
Very accurate pellet, they put a hard thumpin on ground squirrels. When weighing pellets they seem to have a lot less deviation than the originals.
Prosaccurate, hard hitting
Consnone yet
By Doug
Superior Ballistic Coefficient
July 24, 2017
Just a thumper, super accurate, Wicked thumps on Rabbits with 135 Vortex, BT65 fits in mags no problem and is a game slayer, dimes 80-90 ft @ Zero. Clean consistent pellets, just a little dust. I wash all pellets regardless but these are usually very clean.
ProsQuality, precision, consistency, in flight stability, nock down.
By Gary
carson city, nv
AT-44 .25 Loves em!
May 8, 2017
Have been shooting 24gr. JSB exact and they are great. Needed to adjust hammer spring tension and am shooting @Avg. 824fps SD 3. and 51 ft/lbs. With the Heavy MKII. Haven't shot beyond 50 yds. yet as with 6 shots I had a 3/8" group. Both of my Hatsan AT44 10's have been modded,(see Canadian Airgun Forum), and vermin don't stand a chance. I have a new FX Wilcat .25 also and will be sticking with the Kings until the warranty expires.
The shallow skirt on the MKII's is less likely to be damaged in handling and because the skirt is shallow the pellets are seated a little deeper at loading. I think this is a benefit.

Try em, you'll like em!
ConsA little spendy once you add in P/H.
By Matthew
Fort Worth, Texas
Good pellet for the BT65
April 12, 2017
These are the best pellet I have used in the BT65.
By William S.
South Carolina
Great PCP weight pellet
April 7, 2017
Looking for a heavier (.25cal) weight hunting pellet that is accurate. Hitting small spinner target off hand at 25-30yds. Have not changed sights from slightly lighter pellet for same distance. Have yet to bench test for groups. JSBs. Enough said.
ProsGreat heavy weight pellet for hunting if you have the power to push it.
ConsPellet most likely too heavy for most springers unless you are extremely close.
By Manuel
, Napa ca
Very accurate heavy pellet
March 1, 2017
I love these pellets. I've tried a lot of different pellets on .25 cal. My rifle recommends extra heavy pellets. None more accurate then these ones.
ProsThey hit hard and accurate time after time
ConsFor my rifle at least I wish they made heavier pellets. But these ones do the job just fine. No real complains here
By Lee M.
JSB Awesome Pellets
February 1, 2017
So far every JSB pellet I have tried for my .177 and my .25 have preformed spectacularly. I have some .22 ones in route to the house. I fully expect them to be of equal quality.
By John
Aledo, TX
Awesome in 0.25
January 25, 2017
These are the best, most consistent pellet in 0.25.
I'm just wondering what JSB could do to make them even better?
January 10, 2017
By Doug
135 Vortex loves these pellets
August 30, 2016
Very accurate and super hard hitting. I use them in my 135 Vortex, get over 700 FPS with them, great hunting pellet. JSB quality. Wash, wax/oil shoot. Also great in the BT65 and get over 900 FPS for that rifle.

One of the best hunting pellets in .25. great when there is a little wind and others are just moving more than you want.

Most shooters who demand performance will definitely benefit from washing your pellets. If you don't think haven't tried it.
ProsAccurate, consistent fit, very hard hitting.
By james
Scottsdale, AZ
MK ll or MK l
August 3, 2016
Both are equally accurate and load and in the FX impact magazine flawlessly.
Shipping , handling and delivery by Airgun Depot continues to be flawless. Well packed and on time.
ProsConsistent accuracy in the FX impact.
By Rich
Elkton MD
Another winner
May 20, 2016
JSB took it on the chin a little bit over this pellet at the very beginning, truly they listened to the masses and re-did it and came up with this excellent pellet, that that fixes all the problems that people had with the original 33.95 pellet. This is a great very accurate, long range, hard hitting pellet.
ProsGreat no brainier, when in doubt, shoot the MKII.
By Robert P.
Pine bluff, Arkansas
Great pellets !!!!
October 20, 2015
Great pellets heavy & hard hitting !! I use them for hunting they're jus what i was looking for . Squirrels & rabbits don't stand a chance . They're super accurate like all jsb pellets i've tried. Would highly recommend. I've already ordered 2 more tins don't want to run out !
ProsEverything about thiese pellets are good.
ConsOnly wish it had a screw on top . But i can work with it like it is .
By Dirtdawg
Chip off the 'Ole Block
September 29, 2015
East European block! Nicely done with thinner skirts.

Never had an issue with my Rapids or RAW, in the Daystate AR maybe a snug fit, the AW was the issue. The mags are poorly made and do not have a retaining o-ring for the .25. Chamber fit was a tad tight with the older version-no more!

Have not tried in my Falcon, I suspect the older version maybe harder to chamber. The Falcon manual of arms does not permit a ham handed approach.

ProsIt was in stock Good heavyweight alternative if your gun doesn't like HN Barracudas
ConsNow it's not in stock
By HunterOne
Southern California
Great Pellet!!!
September 14, 2015
This is a very accurate pellet. It fits into the magazine of my BT65 easily with no resistance. I am able to push them at an average of 917 FPS and 50 yard groups look great. I will definitely be stocking up on these!!!
ProsVery accurate and hits extremely hard. Fits into magazine without resistance
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