I have a bunch of #1355 Sierra 55 Gr HPBT and some Benchmark .The Sierra bk has 23.6 to startup to 25.2 I used cci primers Wolf cases and got flat primers from 23.6 to 24 Gr of BM .The BM does meter well and it is here + the bullets and cases,I suppose it leaves me with changing primers or go buy different powder.Thanks for the help.
CCI400s flatten easily.
Check your velocity. If it isn't approx to the book vels given barrel length, your pressure isn't the same either.
