If you are going to use Clays make sure you are doing so in a fully supported chamber. Any gun with a standard chamber need not apply because you will absolutely have case head separations which will blow metal fragments back into your face.
Seriously, I don't know where some people get their ideas from...."you
will absolutely have case head separations?"....I've had my Glock 22, 2nd gen, for 18 years, with the standard barrel....I mostly reloaded with Clays (used Win231 for awhile, but now I`m switching back)....I NEVER had a problem...Other people at my gun clubs, who use their Glock 22's, factory barrels with Clays, have NEVER had a problem....
As I said earlier, this Ka-Boom stuff is almost always the fault of the reloader....They either over charged the case, or they reloaded a case well pass it's prime (continuing to reload a case even when there are sights of case fatigue).... Reloaders are cheap bastards, and all too often they will "push their luck" with a case, rather than toss it....
As for "blowing metals fragments into your face", you may need to rethink that about "unsupported chambers"...If there is a case head separation, it blows downward, through the magazine well, rarely into the face...However, will a fully supported chamber, if you have case head blowout, the blast will always be directed back into your face...
Plus, lets not hyperventilate over he term "unsupported chambers" like it's a nuclear device just waiting to explode...
Let's not scare away new reloaders with misleading stuff....