Recovered this shooting into a frozen 2L bottle on its side at 140 yards. 55 grain winchester psp loaded up with 25 grains of benchmark, cci primer & lake city brass. Fired from a 16" rock river coyote special. Actual weight of projectile was closer to 56 grains, retained weight was 52 grains including the little piece which broke off when I fiddled with it. Penetration was almost the 3/4 the length of the bottle. If my calculations are correct it retained about 92% weight. Not intended as scientific just messing around on my day off.