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Indulge me a bit, please.
Take a factory round and drop it into your barrel (disassembled from your gun) with gravity alone as Spammy_H suggests, listening for a pleasant "thunk". Observe where the base of the cartrige is. Upend the barrel and the round should drop out by gravity alone. Do your handloads do the same? Observe where the base of your handloaded cartridgte is. Same place?
Does the failure to chamber happen only when shooting or also when chambering a round manually? If only when shooting, it could be limp wristing or the recoil of the round being not enough to fully cycle the action (lighter recoil spring would help). If it happens even when manually releasing the slide, it is probably (as several have speculated before me)
1) the case mouth still being too belled and jamming as it enteres the chamber - apply a little more taper crimp.
2) the bullet hitting the rifling - seat a little deeper, but take care to adjust your powder charge to avoid overpressure conditions
3) the bullet being a little oversized - unlikely, but post-sizing should fix that
4) the plating is being scraped from the side of the bullets and building up in front of the case mouth, effectively making your case too long for your chamber - make sure you have adjusted the seat/crimp die correctly (you may be crimping too much as the bullet is still being seated) or
5) You have not belled the case mouth enough to let the bullet enter the case - increase your bell.
Some other suggestions:
If you want, you can make an experiment to see if separating the crimping from the seating will help. You can separate the operations with your existing Seat/Crimp die.
When seating, back the body of the die out so it applies no crimp, but run the seating stem down to seat the bullet to the right OAL. Do all your bullets that way. No crimp.
Then take your entire production run and run them through the press again with only just the Seat/Crimp die installed in your press. Take the seating stem all the way out (or adjusted 'way out) and adjust the die body to apply a taper crimp.
Good luck and thanks for asking our advice.
Lost Sheep
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