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Min & Max Pellet weights for Air Rifles

Posted: Mon Feb 11, 2013 5:40 pm
by brihacharan
Hi Guys,
> Here's some useful information on minimum & maximum pellet weights that can be used in Spring Piston Air Rifles...

MIN & MAX PELLET WEIGHTS SUITABLE FOR AIR RIFLES
If you look closely, many of the advertised velocities claim “Up to 1000 fps” or whatever. It is important to understand that when they do their promotional advertising and testing, they use very light pellets usually weighing 6gr or less, sometimes as little as 5 gr. Using pellets that light will usually provide the advertised/claimed velocities. However, when using a “standard” weight pellet of 7.9gr to 8.3gr or maybe even heavier, the velocity drops dramatically. That is to be expected.

INFO REGARDING THE DIFFERENT PELLETS AND THEIR USE:
I suggest that you do not use light pellets in your gun. Shooting light pellets can be very hard on you gun internally, hard on the spring and seal and usually cause the gun to shoot very harshly. It can be almost like dry firing your spring piston AR when really light pellets like PBA’s are used.

By the same token, do not use heavy pellets in your gun, they can and will sometimes cause severe damage to the main spring in Springer Guns. They can cause damage and detonation. This can and will cause spring fatigue and spring destruction beginning with just a few shots and when disassembled, the damage caused by heavy pellets and detonation is easily detected and identifiable. The spring failure is not the fault of the spring but spring abuse. Use heavy pellets at your own risk and expense.

FOR THE LONGEVITY OF YOUR SPRING GUN:
My suggestions are for .177 caliber gun that the minimum pellet weight should be 6.9 grains and the maximum pellet weight should be 9 grains.

For .22 caliber gun that the minimum pellet weight should be about 13.5 grains and the maximum pellet weight should be about 15 grains.

Bob Werner aka: CharlieDaTuna
(He is a well known & respected AR tuner in USA)

Happy Shooting! :D
Briha

Re: Min & Max Pellet weights for Air Rifles

Posted: Mon Feb 11, 2013 7:21 pm
by dr.jayakumar
briha sir,thank you so much.can you guide us for pcp's?
regards
dr.jk

Re: Min & Max Pellet weights for Air Rifles

Posted: Thu Feb 14, 2013 2:30 pm
by essdee1972
Briha sir, thanks, once again!!

Is the weight range of different brands (Indian) available anywhere, or does one need a friendly jeweller / chemist to find out?

Re: Min & Max Pellet weights for Air Rifles

Posted: Thu Feb 14, 2013 3:32 pm
by brihacharan
essdee1972 wrote: Briha sir, thanks, once again!!
Is the weight range of different brands (Indian) available anywhere, or does one need a friendly jeweller / chemist to find out?
Hi SD,
> Pellet weights are difficult to come by....
> in fact I sought the benevolence of my friendly neighborhood jeweller to spare his sensitive "Electronic" Mettler Balance to find out & the findings are:

1. G Smith Round Heads - 10 pellets = 12.290 gms ie: 1 pellet = 1.23gms = 19 grs
2. Magnashot Round Heads - 10 pellets = 10.52 gms ie: 1 pellet = 16.2 grs
3. Mastershot Round Heads - 10 pellets = 8.42 gms ie: 1 pellet = 14 grs

(The conversion rate is: 1gr = 64.8 milligrams or 0.065 grams)

> Additionally - 35 Joules = 30 ft/lbs & 220 Bar = 3200 psi
This is in case you wish to know the power of your ARs spring & Pressure required for PC Air Rifles

> The ideal Transferport Size for maximum efficiency in ARs are:
1. For 0.177 cal = 3.12 mm
2. For 0.22 cal = 3.68 mm
>
Hope these will help :D
:cheers:
Briha

Re: Min & Max Pellet weights for Air Rifles

Posted: Fri Feb 15, 2013 8:29 pm
by pratik_mahale
Briha sir it really interesting & I found some more interesting write-up by Ian Pellant & it’s really worth reading this file

Re: Min & Max Pellet weights for Air Rifles

Posted: Fri Feb 15, 2013 9:18 pm
by Mack The Knife
> Additionally - 35 Joules = 30 ft/lbs & 220 Bar = 3200 psi
35 J = 25.82 ft.lbs. and 220 BAR = 3,191 psi.

For those interested in the more techincal side of airguns, I would recommend Gerald Cardew's - The Airgun From Trigger To Target.

Re: Min & Max Pellet weights for Air Rifles

Posted: Mon Feb 18, 2013 11:35 am
by brihacharan
Mack The Knife wrote:
>
Additionally - 35 Joules = 30 ft/lbs & 220 Bar = 3200 psi
35 J = 25.82 ft.lbs. and 220 BAR = 3,191 psi.

For those interested in the more techincal side of airguns, I would recommend Gerald Cardew's - The Airgun From Trigger To Target.
> Thanks Mack - I stand educated :D
Briha