03-09-2015, 12:22 AM
Something is not quite right here, 65Whelen. Logic says that if everything you said is accurate, you should not have any issues. The trick is discovering what is different from your stated facts.
If your bullet profiles are the same (you're comparing apples:apples), then there is no reason why you couldn't load your own 123 SST's to factory COAL and have them chamber properly.
Just as a hunch, did you check your headspace on those cases with a case comparator? Since the bolt won't close, I suspect that the cases in that batch of loads may not have been bumped enough. That theory, of course, would mean that the sizing die had been adjusted between the various loads, which isn't something I would imagine happens often. A simple test for this theory would be to pull one of the bullets and try to chamber the empty case (taking proper safety precautions, if you decide to leave the primer intact).
If your bullet profiles are the same (you're comparing apples:apples), then there is no reason why you couldn't load your own 123 SST's to factory COAL and have them chamber properly.
Just as a hunch, did you check your headspace on those cases with a case comparator? Since the bolt won't close, I suspect that the cases in that batch of loads may not have been bumped enough. That theory, of course, would mean that the sizing die had been adjusted between the various loads, which isn't something I would imagine happens often. A simple test for this theory would be to pull one of the bullets and try to chamber the empty case (taking proper safety precautions, if you decide to leave the primer intact).