I like the Speer SB also. But another not mentioned that
is also good is the Rem. Golden Saber 125+P.

During your testing be sure to check for "bullet jump." This happens under the stiff recoil experienced in these small guns. The bullet in a chambered round can "jump" out of the case slightly, sometimes a bit more with each round fired, finally sticking forward into the forcing cone locking up the cylinder. Measuring with a caliper is good, but eyeballing next to a round that hasn't been in a chamber when another round was fired is also good. Be sure to check #5 in the cylinder especially, as it's been exposed to recoil 4 times. The 110 gr. rounds are notorious for this due to the decreased bearing surface available. But check in your gun.

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USAF, 69-92
Vietnam, 72-73