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Discussion Starter · #6 ·
The formula is simple. You just have to convert grammes to grains (plenty of converters online).

V(fps)squared X Wt(grains) / 450240

So an 80 grain projectile at 220 fps would be: 220 x 220 x 80 / 450240 = 8.59 fpe
Thanks, I'll convert your formula for grammes, from grains, as my mass data are always in grammes.

Mike
 

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The formula is simple. You just have to convert grammes to grains (plenty of converters online).

V(fps)squared X Wt(grains) / 450240

So an 80 grain projectile at 220 fps would be: 220 x 220 x 80 / 450240 = 8.59 fpe
Thanks, I'll convert your formula for grammes, from grains, as my mass data are always in grammes.

Mike
This should make it easy for you... 1 gram = 15.4324 grains
 

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Registered
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591 Posts
Discussion Starter · #8 ·
The formula is simple. You just have to convert grammes to grains (plenty of converters online).

V(fps)squared X Wt(grains) / 450240

So an 80 grain projectile at 220 fps would be: 220 x 220 x 80 / 450240 = 8.59 fpe
Thanks, I'll convert your formula for grammes, from grains, as my mass data are always in grammes.

Mike
This should make it easy for you... 1 gram = 15.4324 grains
Thank you, yes i did know that bit, because I used to struggle with the venerable "Grains" scene when I was shooting black powder replica revolvers, and reloading cartridges for a 44 magnum Ruger Super Blackhawk . . . :)
 
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