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JSB Diabolo Exact Monster .177 Cal, 13.4 gr - 400 ct

Only $21.99
  • Save $5.00 (18%)
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  • Code: PY-P-897 · $21.99 · .177 · 13.43 grains · 400 ct
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The weight of the Monster Exact Diabolo pellets have been chosen to fit the most powerful air rifles currently available on the market. It is a really heavy weighted pellet that is stable even at higher power levels. A top choice for airgun hunters. Also check out the new Diabolo Beast if you're looking for something even heavier.

JSB pellets are considered to be one of the premier pellets made today. These .177 caliber Monster Exact pellets weigh in at 13.4 grains- which will do the job if you like to hunt or do pest control with magnum air rifles or precharged pneumatic airguns.

JSB Diabolo Exact Monster Features
  • .177 cal
  • 13.4 grains
  • 4.5 mm diameter
  • Cylindrical
  • 400 pellets
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  • ManufacturerJSB
  • Caliber .177
  • Ammo Type Pellets
  • Ammo Weight 13.43 grains
  • Pellet Shape Cylindrical
  • Pellet Quantity 400 ct
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Average Customer Review
5.012 Reviews
92% (11)
8% (1)
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By Mike WeibleJanuary 23, 2021

Just bought my first hunting type airgun because it's next to impossible to find. 22 rimfire to use keep predators from wiping out my chickens and ducks, also not knowing too much about pellets I bought some exact monsters for the weight thinking that would help. Predator showed up this morning one shot behind the ear at about 20 yds and he dropped. Great pellets.

Super accurate and hit really hard


By DeathOctober 31, 2018

Excellent weight for a .177 pellet. Must have a 1200 fps or more gun to sling this out there. It almost turns a .177 into a .22 pellet gun and your kill ratio will go up.

Excellent for squirrel / Rabbit / Crow. One shot and "down goes frazier".... Excellent Penetration from 30 - 40 yards.

Cant offer anything up here, never have experienced a problem.

By JoeUSASeptember 18, 2018

As with any gun, there are always going to be an ideal range of weight, diameter and balance that will determine the best pellet for that gun. For my guns that have the necessary power to propel this pellet there's no question but that these are the choice when the shot counts. .177 rounds are notoriously vulnerable to wind but the extra heavy weight and more symmetrical skirt lessen the effect of wind although they do increase the angle of incidence to the POI. However the later is a controllable factor where as the former (the wind) is a uncontrolled variable. The bottom line is, if you're going accuracy at distance and have a rifle capable of sending a projectile of this weight down range efficiently, you'll be very pleased with how these pellets perform. Why 4 stars instead of 5 ? ..... Cost, plain and simple. These are expensive pellets but well worth the cost when the shot is on the line.

Good QC provides minimal variances in weight and mostly occlusion free heads.

Your wallet will think you're shooting rimfire rounds.

By JoeUSAApril 19, 2018

I use theese heavier ammos types to zero rifles and I pull them out when I want tight shot groups.

you can maximize for foot pounds downrange with pellets like theese

By ChristopherUSAApril 5, 2018

I have been shooting these through a Gamo Silver Shadow 1ooo and they are accurate up to about 30 feet. Shooting beyond that they lose their velocity very quickly and become not so accurate. No bent pellets and very clean.

Accurate, hard hitting, clean pellets.

Velocity drops quickly after 30 feet.

By Kelly T.February 27, 2018

These pellets produce a consistent one hole groups at 20 yards in my Umarex Gauntlet.

Accuracy, cost at $14.49 plus discount if purchasing 4 packs at a time( fourth free)

They may be changing this pellet design soon for the better or worse? I stocked up on the old style, and have not tried the new style.

By DanUSAFebruary 14, 2018

I use these in my Gauntlet

good packing and good quality control ( no bad pellets )


By DavidUSASeptember 5, 2017

Great for long range accuracy and penetration


Tin needs redesigned

By MikeUSAJuly 9, 2017

I got these pellets to shoot in my high powered 177 cal guns since the extra weight slow the velocity down so its under the transonic range to keep the accuracy consistent. My B51 loves these heavy pellets and shoots them right in the sweet spot of 890 to 900 fps.

Very consistent and accurate pellets in higher powered 177cal guns that overpower lighter pellets and shoot the light pellets up in the transonic range which destabilizes the pellets flight causing accuracy to suffer. These also retain good energy down range to provide good knockdown power out at longer ranges when hunting. Also help buck the wind when shot in the high 800s to low 900s velocity ranges. The dumbbell shape really makes this pellets stable out to long ranges.

The only con I see is they need to come in 500 count tins.

By ChengUSAApril 28, 2017

I decided to buy this 13.4 grain jsb heavy pallet base on the good review by the previous buyers just to prove them right and they are right! My synth Rod loves these pallets more than any pallets that I've bought.I only use this one for my every days shooting now and they work like charm...Hit hard and on target.I only have limited range of 25 yards and these pallets will hit a nickel almost every times...good enough for me.

Good quality, accurate,and hit hard and very good for small hunting games.

Can 't find any.

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Has anybody tried these with the Crosman Vantage NP? Do they fit?

asked Jason from USA

They will fit. They are a bit heavy to shoot very well. A 10 grain will shoot better.

Mark from USA
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