It's a bit of a skill to consistently measure cylinder throats with a dial caliper. Just takes practice at only that. Pin gauges are very interesting to toy with and a sure thing. I can usually get within 0.001-0.0015" using a caliper compared to pin gauges. I'm a hobbyist at best.
I have found only ONE gun, revolver, with a "tight bore" or constriction in the bore. This is out of about two dozen I've checked. Interestingly the one was a factory barrel not custom. It was an odd case and only detectable, reparable, monitoring it with pin gauges. Cylinder throats are checked by poking increasingly larger by 0.001" little "pins" or round mic'd cylinders until you find the one that won't quite go through. A good way to amuse yourself for a while. All the effort is negated if you simply shoot a cast slug a bit larger. Forcing, by shooting, it makes it fit.
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I should know this, but
- Ed, 2017-12-27, 18:29
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I MOSTLY SHOOT THE LARGEST DIAMETER
- JT, 2017-12-28, 07:22
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I think they are probably a little tighter too
- WB, 2017-12-28, 08:04
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You made me work
- Ed, 2017-12-28, 13:33
- Ed, just buy .431 diameter bullets and don't sweat the small - Gary Reeder, 2017-12-28, 14:01
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You made me work
- Ed, 2017-12-28, 13:33
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I think they are probably a little tighter too
- WB, 2017-12-28, 08:04
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Well, I'll be in trouble as always. So why not...
- Huey, 2017-12-27, 18:38
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Or you can just shoot them
- Jim Taylor, 2017-12-27, 18:55
- I have to agree with Jim. I have never measured - Gary Reeder, 2017-12-27, 20:09
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But Jim.... That's so, uh, boring... (nm)
- Huey, 2017-12-27, 19:09
- With apologies to Mr. Whelen .. - Jim Taylor, 2017-12-28, 11:09
- When in doubt go big! Loading some LEE tumble lube .41's - WB, 2017-12-27, 19:48
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Or you can just shoot them
- Jim Taylor, 2017-12-27, 18:55
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I MOSTLY SHOOT THE LARGEST DIAMETER
- JT, 2017-12-28, 07:22