Page 6 of 6 - JSB Exact Beast Diabolo .177 Reviews

60 of 60 JSB Exact Beast Diabolo .177 Reviews

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I have a powerful PCP and so I was looking for a heavy pellet to keep the velocity subsonic and so more accurate. At 16.2 gr it fit the bill traveling at 985fps. I also liked the streamline shape for long distance shooting.

I will purchase them again because of their performance but I don't understand why a few extra grs of cheap lead should raise the price that much per pellet.

I can't explain why JSPs of all weights work so well in all my guns but it's a fact. I also can't explain why the H&N sniper pellets I order at the same time and their silver point pellets do so poorly in the same guns. I must have JSP friendly guns. They are,
Baikal izh 46m, Daisy 747, Hatsan at44-10 long.

James-M. Aug 24, 2016

@ Clyde. I ought to mention to you. I don't trust engineers. Especially the ones that claim their title makes them know all mighty. Just because something looks good on paper, doesn't always make it right in the real world. Never the less, theoretically, adiabatic or not, I don't want my pellets to go supersonic anyway. Shoot safe.

John Jul 26, 2016

This sure sounds like incorrect reading of the Hatson published info and a "dry lab" based on that. "At 16.2 gr it fit the bill traveling at 985fps." That gives an energy of 36 FPE. The Hastson data for the 0.177 AT44-10 long shows _36 Joules_ or _27 FPE_ . The correct 27 FPE figure gives a velocity of 865 fps. Looks like maybe the wrong collumn number from the Hatson data was used. The statement that it is "impossible" to achieve a velocity over the speed of sound is wrong. This is just a rule of thumb for normal weight pellets and barrel lengths. There is an insignificant air mass behind the loaded pellet to any significance adiabatic difference. Before you use the term adiabatic you need to know more about the physics of diatomic gasses.

Clyde Dec 11, 2015

I ought to mention that with a pneumatic air rifle, it's impossible to get a supersonic velocity with the pellet. It's a basic principle of physics that gas escaping from a pressure container can not exceed the speed of sound for that gas. Therefore, the maximum theoretical velocity of a mass-less pellet is about 1120 ft/s. Of course, the pellet will possess mass, so the real-world velocity will be less. You may wonder as to how spring-piston airguns acheive supersonic pellet velocities. It's simple. They compress the air in an adiabatic process, which produces a very high temperature of the exiting air. The speed of sound goes UP with increased temperature. You can trust me on this, I am an engineer! :) So, for a pneumatic, if you want high power, you need to go with larger calibers & greater weights of pellets.

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rating
5
Value for Money
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5
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5

They shoot well.

Screw on lid.

These are good pellets and offer a nice tight group.

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rating
4
Value for Money
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3
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3

Twice the mass of the JSB pellets I had been using. These are darned near slugs. They seem to shoot well and pack a punch.

Make the tins threaded so that the lid doesn't fall off. I'm getting tired of cleaning up 250 pellets from my range bag!

These are serious pills of Pb. You'll need some muscle in your gun to sling these.

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5
Value for Money
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5
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5

It makes a big hole in a tin can at 50 yards.

Good take down ammo for small game.

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5
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5
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4

I recoomend these heavier pellets if you are using the Air Force Condor. These have a much tighter grouping than the 8 gr pellet.

500 ct container.

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5
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4
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5

Most accurate and consistant pellet I have shot out of 12 different types.

Nothing

I'm shooting these out of a Crosman TR77 NPS ***GAS PISTON***
This air rifle really seems to love the heavier pellets.

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Overall Rating
rating
5
Value for Money
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5
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5

weight, its ballistic coefficient is amazing

nothing

dont be fooled if muzzle energy is lower then one of your medium weight pellets, with its efficiency it does not lose speed as much as a medium round nose pellets, wich means at distance this one will have double the energy despite starting off a little lower, light and medium pellets are only a quick burst of velocity and they decelerate more quickly then this pellet, so stay heavy with round nose pellets, these are even the weight of many middle weight 22 pellets, so your .177 gives you the power down range of a 22 at a lower price wich is a good option if you like 22 caliber air rifles, just make up for it by going heavy in .177, i own 22 air rifles and found this pellet makes the .177 rifles keep up, and pine tests down range shows more penetration then the 22 pellets, so you get the best of both worlds in this pellet, low cost and high power

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rating
5
Value for Money
rating
4
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rating
5

This pellet is awesome in my marauder...accurate,quite and uniform. The jsb 10.34 and the 8.44 are also great pellets,but this one has the weight and the knock down power as the .22 cal. marauder using the 18.13 gr. grain pellets.I get 1/4" groups @ 25 yards and sometimes closer...good job JSB,very uniform pellets.

make 500 cts.at slightly lower price.The value for the money is ok.

The size of the pellet and the quietness of the gun makes shooting squirrels like popping balloons...awesome.

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rating
5
Value for Money
rating
5
Size/Shape Distribution
rating
5

Huge pellet, also on the larger side as far as circumference. This is a seriously tight fit in my Benjamin Titan. I only bought these to see the FPS difference from the 10.34 JSB, which is the preferred pellet for that gun. The sound difference between the two pellet sizes hitting my target is amazing, you really can tell there is substantial weight difference.

same as all JSB containers, a screw lid please.

Anything I have bought that has the JSB name on it has performed exceedingly well. If you are thinking of trying different pellets, put JSB in your air gun, I would venture to say, you will be pleased

Fred Apr 23, 2015

please post the cono fps for the two tested i have these on order to run through a rws 48

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5
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5
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5

WOW!!! Is accurate and deadly strong, Incredible knock down power best pellet for hunting,

nothing!!

Just for powerful air rifles.

jason Oct 10, 2017

i have tryied these pellets in my rapid air weapons air gun. great groups at 25 meters and after that they loose stability and they are terrible at any range further than that. so for accuracy no I would not buy these again for my raw air gun.not with the lw barrel at least and have yet to try them in my poly barrel.

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