Shot my reloads for the 450 bushmaster today and have incredible velocity spreads all over the map. I am thinking either powder or crimp related but wonder your thoughts. Day was hot, 85 - 95 and sunny, light south wind. 5 rounds in each magazine, no noticeable signs of bullet movement after cycling rounds towards the bottom of the magazine through the gun and inspecting them. Rifle is 16"
1x 450 hornady brass full length sized in hornady dies
Remington 7.5 BR primer
Hornady 225 FTX bullet
w296 powder
crimped using factory die to .475
2.13 OAL
Powder charges weighed on RCBS balance beam scale - reloads were not mixed and shots are in order fired and no rounds were allowed to sit in a hot chamber
Factory FTX load - 2109, 2109, 2143, 2133, 2099 - 1 1/8"
36 - 2048, 2002, 2029, 1799, 1733 - 1 5/8" The 2 that were 17xx fps sounded noticeably different
36.5 - 1872, 1792, 2035, 1841, 1804 - 1 3/8"
37 - 1823, 1819, 1902, 1834, 1784 - 3 1/4"
37.5 - 1924, 1963, 2073, 1870, 1932 - 1 1/4"
38 - 1984, 2154, 2109, 1904, 2051 - 2"
I'm have loaded for some years but can not explain this.