What's the primary risk with setback? Pressure increase, right? Due to less space in the cartridge case?
Gonna pile on with the buy more guns crowd.
I keep one to carry, one to shoot and a spare. Or two.
Also, if there's a chambering issue depending on failure mode (IE - bullet jams in top of barrel, slide on the case, out of battery) - the crimp could be damaged, which would decrease the accuracy of the cartridge if it didn't prevent proper chambering in the future.
And, there's another match on the 12th :-)
Second gun for practice! For all these reasons. And just to have a spare.
I tested setback in HST 147, and couldn’t get more than a few 1000’s after a lot of chambering. When the round starts looking beat up, it’s gone. I never put a chambered round into any carry magazine. If a round gets buggered by chambering, at least it’s either already chambered, or in the training ammo box.
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
FWIW, though I have at least one of every carry pistol, with a clone, I hadn't thought of using one for carry and one for training as I try to share the use.
To the question, rechambering is limited to 3, marked with a sharpie each time. There might be a 4 in the mix somewhere, but never a problem. Glocks and M&P's in 9mm & .45 and 1911's and now and then a Browning High Power 9mm. With AR's, no more than twice.
YMMV
Double post, sorry