You need to know the weight of the pellet in grains (some tins do have the weight written on them).
Say you are using a pellet that weighs 7.5gns.
The formula is:
Muzzle velocity squared, multiplied by the weight of the pellet, divided by 450240.
The result is in ft/lbs.
780x780=608400
608400x7.5=4563000
4563000/450240= 10.13ft/lbs.
This is a formula that I have used since the 70's so there may be an easier or better method of working it out and if this is the case I'm sure that someone will come along and correct me.
I hope this is of assistance.
Regards,
Gary.
Originally Posted by gtfreight
You need to know the weight of the pellet in grains (some tins do have the weight written on them).
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