There is no noticeable difference between mag and regular primers at Starting Load. A small, but important difference may become evident at higher loadings. Read the FAQ's on their web page, Berry has some velocity limits.
Berry doesn't make FMJ bullets In 9mm[/QUOTE]
Minor correction irrelevant to the thread. Berry's makes 1 FMJ in .223
Berry's Bullets - Plated Bullets, Reloading & Shooting Supplies (berrysmfg.com)
https://www.thehighroad.org/index.php?threads/9mm-primer-test.840256/page-3#post-10905312Someone could always reference the testing @Walkalong did
I believe Rem 1 1/2's have a warning on the box about using them in 40S&W.I used some SPM in my .40 S+W loads recently. Did some mixed loads, some at low end and some I didn't go over mid way. They worked, nothing funky happened. Until I can get some reg SPP's I'll use the SPM as I have about 2k of them. I'm about to run out of Rem 1 1/2's do I' may use the spm's unless the NFT order hits by then, lol...