357 Sig help

Shooting it out of a Glock 23 with a kkm 357 Sig barrel. The rounds initially passed the plunk test...and oddly enough chambered occasionally if the slide is moving with enough force. After the range, the three rounds in question appeared to cause the gun to not go into battery...some of the time. I think they were just barely out of spec which is why they did not fire. I adjusted the resizer down a quarter turn and (I recently upgraded presses and discovered I had a little more room to adjust down touching the bottom of the shell plate) all dummy rounds seemed to function fine so I'm hoping this next batch will have corrected it.
 
I appreciate all the input helping diagnose the problem. It's always good for someone to remind you these things and what to look at when having issues
 
Cut to the chase-case guage

This my experience right now. Not trying to disagree or argue-I can guess and measure and do all that stuff. OK, this is what I did. Took handgun into the loading room. Took out my Wilson 357 gauge. Commenced to check all fourteen factory Winchester rounds from my gun-G23 w/OEM 357SIG bbl. Each round was at the maximum step on this gauge. Had there been a problem it would have been caught right then. I'd rather do my calculating before rather than after reloading my rounds.

Addendum: I suggest setting your die down as in the instructions. I am convinced the plunk test is not satisfactory in the 357 SIG. I wouldn't trust those rounds away from a plinking range. YMMV
 
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Just one anecdotal experience: I futzed around with my Glock 23 and aftermarket (forgot whose) barrel for months. Finally got something that worked, but performance was not up to spec. Had to back off from "book" to get reliability. Last year I got a Sig P226, and all issues went away. Rounds are totally reliable at 1,430 fps with 125 Speer GDHP and 1,257 fps with 147 Hornady XTP.

So? Beats me. The Glock is happy with 40s, and I'm pleased as punch with the Sig.
 
Rifleman0311,

Does the recoil feel at all mushy? If so, it's a sign the slide is not getting fully into counterbattery. In turn, that can cause failure to feed with enough run-up to chamber the rounds properly. If that's happening, you may need to increase your powder charge a little.
 
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