For what it's worth.
I had partial boxes of Rem. and Winch. SR (86 primers total) and thought I'd try substituting them for SP primers Monday in my unaltered 4" .357 Mag GP-100......I did not change my normal powder charge or bullet.
I was shooting off bags at the freshly painted 25 yd. 8" steel gongs.
Of the 86 rounds 80 fired without a problem but 6 rounds would not fire the first or second time.....I did notice that 'ALL' 86 primer hits were noticeably lighter than when using SP primers.
I also did not notice any accuracy or recoil difference and if anything the SR loads shot as accurate or slightly better than my load using SP primers.
