Can anyone tell me how to figure muzzle energy? I have a hand gun shooting 120 gr. bullets at 2075 fps. I read somewhere that you need about 1000 ft. lbs. of energy for deer sized game. Will this load be sutiable for deer sized game out to 150 yds? The gun is a T.C. Contender 10" barrell in 7-30 Waters. Thanks for any help you can give me.