00005 out of round and getting bigger, a further 1/4" and the diameter was still opening up. at about 27-1/2" from the breach end I measured my smallest diameter, 1/4" further the diameter was. I didn't worry to much about the middle, and started my measurements again at 25" from the breach end and measured at 1/2" intervals, the diameter was slightly smaller and the taper continued, in my mind validating my decision to skip the measurements in the middle of the barrel. KeithI suppose you could refine the measurements down to what ever spacing you wanted, I chose to do measurements at 1" intervals from the breach, I only went the first 3" and found a slight taper already starting to develop. 030 shorter or longer gonna make that much difference when we're taking about 1/10ths? If the muzzle has choke isn't wherever you cut it the tightest spot? Is. So, take this for what its worth which is absolutely nothin'. I know nothing about slugging a barrel having never even attempted it.
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