No setback will occur if the bullet isn't being smacked nose-first into the feed ramp. If you press check in a normal fashion there is no way for this to happen.
Posting again to add that, since about '98, PMC Starfire .45 ACP ammo has proven really prone to chambering setback in just about everything.
1911s can cause a little setback in almost everything over a half dozen rechamberings or so.
Just measured the chambered round in the only gun I have with me right now (I'm at work) and it's a teeeensy bit shorter than the next one in the mag (230 gr. Hydra Shoks).
In support of Tamara's post, correctly "press checking" means you only open the action/breach enough to see that a round is chambered. You should not fully extract the round from the chamber so there is no possibility of bullet set-back, give that you perform the press check correctly.
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