Dunno why some people make a big deal about doing this, as if it were "dangerous."
As has been pointed out elsewhere, some "small pistol primers" are actually the same as some "small rifle primers." The CCI 400 SR primer is also the CCI 550 Magnum SP primer.
I don't remember when I got them but it was decades ago, I have thousands of Federal 200 small rifle primers.
I have used them in 222 Rem loads and 9mm/357 Mag loads, they always seem to work great. now days Federal 200's are small pistol magnum primers
