You need to know the weight of the pellet in grains (some tins do have the weight written on them).Originally Posted by a88ott
hi there
im looking for information
how to convert
780fps to ft lbs
or a 1000fps
ive found nothing to help
so im wondering if anyone here can
thanks
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.
Reply With Quote