No worries. We're only confused 'cause the manufacturers confused us.
I think I still have both 205s and 205Ms.
My only rifle feeding on SR primers right now had issues. It had a weak spring which apparently allowed the firing pin to be pushed back up the bolt causing the primers to develop a "nipple" that extruded up the firing pin hole and sometimes pierced. Once I realized what the problem was, I had the bolt core replaced with a GreTan unit 'cause I thought the tip of the firing pin might have been eroded. Being a fan of overkill
I also had the gunsmith replace the GreTan spring with an extra power spring. And I switched to Remington 7-1/2s for the thicker cup and (at least nominally) match consistency.
That may be overkill, subsets of the solution might have been adequate, but before I realized what the problem was, I'd destroyed THREE different Jewell HVR triggers, at $225 each, because the gas venting down the bolt body from the pierced primers smashed the sear surfaces together and crumpled them, and in that context, overkill on a solution is just fine by me.
Anyways, I have a few leftover WSRs, a few CCI, a few Federal 205s and 205Ms, but right now I'm only shooting Rem 7-1/2s. When I someday buy another rifle that needs 'em, I'll try the others.
The Fed 200s would probably be my first choice for a .22 Hornet or the like. Lot of people have experimented with small pistol primers rather than the recommended small rifle. I think they'd be good. I used a lot of them years ago in .357 mag loads that today are way over book max though they were recommended at the time. They were great in that application. I had a 4" blued GP100 that would put 6 170 grain Sierra JHCs over 16 grains of 296 lit with the Fed 200s into quarter inch center to center 25 yard groups, in other words, basically there was no variation in load, the only variation was in my aiming consistency. The little SOB had a mean kick for a full weight .357, cool shock wave, too.
Uh .. oops. Sorry for the long-winded ramble. I get a mite carried away sometimes.Tom