Originally Posted by
bigcountry
Bottom line is, you have an unsupported part of the case. Thats means, load at your own risk. i load starting loads with my G21 and use +P starline brass. For months, I took notes with a micrometer measuring any expansion. I am sure I could go more.
But I decided to nip it in the bud and just get a bar sto bar match barrel. That way I can shoot until the brass cracks if I want.
Heh. See, I'm so content with my unsupported chamber that I didn't ever realize you were talking aftermarket barrels. My bad. I am curious as to any change in reliability with the fully supported chambers but have never really looked into it as I never saw a reason to switch.
There is no set number of loadings. As bigcountry said, it's at your own risk. I load down away from max pressure, closer to minimum loads, and toss them after what is a very small number of loadings for straight-wall pistol brass.
I don't shoot reloads for self-defense, which is the only time I need full power ammo, and the POI is close enough. So no need to worry about it to me as I get enough free brass.