What is the best way to get the throat measuement in a revolver? I'm going to start casting some 200gr .38spl bullets after seeing some promise with Western Bullet Co. hard cast ones. I wanted to try something about Bn 10-12 sized for the throat rather than the land dimensions, at about 650-750 fps.
Accurate throat measurement in a revolver
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Take a .359" bullet and see if it passes. If it does, strike the nose with a hammer and that will bump up it's diameter, then force it through and measure.
Get a 100 pack of .360 lead balls. Take off the cylinder and drive six through (with a good fitting brass rod) and measure them.
You can also load them up for rabbits and such.. check out castboolits.com
You can also load them up for rabbits and such.. check out castboolits.com
A cheap inside micrometer will work as well, although pin gauges are easier. The easiest and cheapest way is to use lead as posted. We don't have to be perfect here, just real close. Mainly we need to know if the throats are undersized, because if they are, we will need to have them reamed. As long as they are over groove diameter, we can usually shoot lead with no problems. The throats will have to be way over sized before it becomes a real problem.
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Going to try the lead route. I have a bunch of 36 cal. revolver bullets that are .361" I think. Thanks for the help.
That's the ticket! Might want to keep track of which ball went through which chamber, too, just to see how consistent they are. Having the throats reamed by someone like www.cylindersmith.com will only run you about $30 and will likely be worth the money if there's any hint of tightness.
[EDIT: Whoops, cylindersmith has stopped working on anything but .45s! Too bad. Well, there are others that perform the service.]
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