I dont shoot factory ammo much anymore, and I am trying to figure out the energy discrepancy between different lots of FGMM 168 grain match ammo.
I have about 15-20 boxes of the older FGMM in the blue and white boxes and about the same in the newer red and black boxes. Both are 168 grain SMK's.
On the back of the box, both claim a muzzle velocity of 2600 fps. Yet, the white box stuff claims a muzzle energy of 2520 ft. lbs and the black/red box claims 2625 ft. lbs.
I am no physicist, but I thought energy was a result of mass multiplied by velocity. How can 2 168 grain bullets traveling an identical 2600 fps yield different energy levels?
There must be something my feeble mind is missing. Can someone explain?
I have about 15-20 boxes of the older FGMM in the blue and white boxes and about the same in the newer red and black boxes. Both are 168 grain SMK's.
On the back of the box, both claim a muzzle velocity of 2600 fps. Yet, the white box stuff claims a muzzle energy of 2520 ft. lbs and the black/red box claims 2625 ft. lbs.
I am no physicist, but I thought energy was a result of mass multiplied by velocity. How can 2 168 grain bullets traveling an identical 2600 fps yield different energy levels?
There must be something my feeble mind is missing. Can someone explain?
