shooting today(of all things in very rainy weather, but wth, its an ak) i had i mag full of fmj wolf and another of hp wolf(both feed fine) but i noticed a serious discrepancy in the power of the fmj and the hp, with the fmj being an actual slap to my shoulder and the hp being  a virtual pussycat(much easier to doubletap, via much less muzzle rise). The fmj was much stronger for felt recoil, no chrono available though(was sure it would have been at least 100-150fps faster due to the felt recoil(I am pretty recoil sensitive). anybody else noticed the same thing?

Bullet weight different ?