Author Topic: I just love pellet consistency—NOT!  (Read 1106 times)

Alan

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I just love pellet consistency—NOT!
« on: October 27, 2016, 09:35:43 AM »
Several folks here have openly stated that the .25 caliber JBS Kings (25.39 grains) are the same pellet Air Arms sells under the name Diabolo Field (25.4 grains). Well, I don't think so.

The JBS pellets shoot better than 3/4 inch groups at 50 yards (indoor range), and hit dead center. Doing nothing but using the Diabolo Fields, the gun shoots low, and to the left almost 2 inches at 50 yards. Resighting places them where they belong, and the groups are a bit better (≈5/8 inch groups). Switching back to the JBS pellets, and they now hit high and to the right 2 inches as expected.

I conclude the pellets are indeed different, albeit I haven't compared them under a microscope, nor have I weighed them. In any case, it is food for thought!


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Alan

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TexasInfidel

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Re: I just love pellet consistency—NOT!
« Reply #1 on: October 27, 2016, 06:26:28 PM »
I did almost the same thing recently with a NP2 trail
Boxed Premires
JSB 15's
JSB 18's
All three ammo ran exactly different POI from each other,very tight 5/8 or better stacks with 5-10 rounds
Either dead on or low right or low left,pretty much why I ditched my Mrod,it never played nice.
My BT65 eats anything its fed and does it with consistent authority out to 150yds on paper or steel.
Small critters are dusted hard inside 100yds to almost boring levels.
Shooter
Ammo
Rifle
Much like Air,Fuel,Spark for a combustion engine,if you have all three its likely who's turning the key
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mobilemail

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Re: I just love pellet consistency—NOT!
« Reply #2 on: October 28, 2016, 02:09:43 AM »
Several folks here have openly stated that the .25 caliber JBS Kings (25.39 grains) are the same pellet Air Arms sells under the name Diabolo Field (25.4 grains). Well, I don't think so.

The JBS pellets shoot better than 3/4 inch groups at 50 yards (indoor range), and hit dead center. Doing nothing but using the Diabolo Fields, the gun shoots low, and to the left almost 2 inches at 50 yards. Resighting places them where they belong, and the groups are a bit better (≈5/8 inch groups). Switching back to the JBS pellets, and they now hit high and to the right 2 inches as expected.

I conclude the pellets are indeed different, albeit I haven't compared them under a microscope, nor have I weighed them. In any case, it is food for thought!

Same thing with .177. If you look very closely at the inside of the pellet you can see a difference visually. My Marauder has a slight preference for the AA. After sorting hundreds of AA and JSB with a pellet gauge, I firmly believe the AAs are more consistent in size - at least that was the conclusion from the lots I tested.  I have some AA in .25, but haven't had the chance to do a shooting comparison between them and the JSB.
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nervoustrigger

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Re: I just love pellet consistency—NOT!
« Reply #3 on: October 28, 2016, 04:42:10 PM »
As Mobilemail stated, there are usually visible differences between the JSB and Air Arms pellets of a given caliber and weight.  But as far as expecting an identical POI at 50 yards...well, don't expect that for any two tins of pellets unless they are from the same batch (meaning, same die).   A tin of JSB Kings bought today will have a different POI than a tin of JSB Kings bought 6 months ago, and different from a tin purchased 6 months before that.  I'm convinced it's only because they group so well that we're able to distinguish those differences. 
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