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This is usually more relevant to rifle cartridges, but can probably be used for the new high-pressure pistol rounds (.357 Sig, 40 S&W etc.). Measure the web area of the case (just above the rim or extractor groove) if you and your micrometer are capable of consistantly measuring to .0001 (yes that's 1 ten thousandth) of an inch. You want to keep the expansion to .0001 or less before and after firing on a brand new case.
If an autoloader starts having problems at any point of the feed cycle and you know the recoil spring is okay, the gun is clean and oiled; then you are exceeding the design parameters of the gun.
Cases sticking in revolvers has more to do with the finish in the chambers than the pressure; but if factory ammo doesn't stick and your reloads do, back off on the powder charge.
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