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Posted: 4/28/2017 11:55:24 AM EDT
[#1]
Soft lead ball or cylinder (slug) slightly larger than anticipated bore size, lube, non-metallic rod and a mallet. Good caliper or micrometer to measure what comes out.
Lube lead slug, tuck it into the chamber throat and drive it through (or in a bit, and then back out) to take an impression of the lands and grooves. Measure the major (between the grooves) and minor (between the lands) diameters of the slug after it's out. |
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Posted: 4/28/2017 12:17:52 PM EDT
[#2]
Need to measure a revolver, is it possible to drive in from the muzzle and not damage the crown?
primerhead |
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Posted: 4/28/2017 12:42:53 PM EDT
[#3]
A plastic mallet to get it started then a wooden dowel rod to tap it through. Won't hurt a thing.
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Posted: 4/28/2017 12:49:48 PM EDT
[#4]
When I did mt .357 revolver, I used a 5/16" wood dowel and tapped through a lead egg fishing sinker (sorry I don't remember the weight of the sinker) that I had lubed with resizing lube.
The lead was soft enough that it went through the bore fairly easily with some light taps with a rubber mallet. |
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Posted: 4/28/2017 1:26:19 PM EDT
[#5]
Quote HistoryQuoted:
When I did mt .357 revolver, I used a 5/16" wood dowel and tapped through a lead egg fishing sinker (sorry I don't remember the weight of the sinker) that I had lubed with resizing lube. The lead was soft enough that it went through the bore fairly easily with some light taps with a rubber mallet. |
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Posted: 4/28/2017 1:28:11 PM EDT
[#6]
Brass still beats a wood rod.
I earned money over many years removing wood rods that split and jammed. |
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Posted: 4/28/2017 2:09:39 PM EDT
[#7]
Quote HistoryQuoted:
Need to measure a revolver, is it possible to drive in from the muzzle and not damage the crown? primerhead Instead what you want to do is measure each cylinder mouth. Ideally you want each cylinder mouth to be identical, and all of them to be .001-002" over bore size. It's better in a revolver to have a barrel fit the cylinder mouth properly. |
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Posted: 4/28/2017 6:28:50 PM EDT
[#8]
Yes, just so happens it is a S&W Model 25 Classic 45LC. I understand each cylinder mouth should be .001" to.002" larger than the bore.
This gets back to the question, then how is the bore size be determined? Thanks primerhead |
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Posted: 4/28/2017 6:31:03 PM EDT
[#9]
Quote HistoryQuoted:
Yes, just so happens it is a S&W Model 25 Classic 45LC. I understand each cylinder mouth should be .001" to.002" larger than the bore. This gets back to the question, then how is the bore size be determined? Thanks primerhead It won't be exact. If you want exact, you will need a set of pin gauges. |
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Posted: 4/28/2017 9:20:43 PM EDT
[#10]
I'm not being a smart a$$. You need to get the technical details correct.
In a rifled barrel there are 2 different diameters. 1) The bore diameter This is the smaller of the two. 2) The groove diameter. This is the larger of the two. Both of these are important but with a revolver the cylinder bore is also a major factor because if your cylinder bore is much smaller than the groove diameter there is little chance of getting decent results with lead bullets. Motor |
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Posted: 4/30/2017 5:57:29 PM EDT
[#11]
Quote HistoryQuoted:
A plastic mallet to get it started then a wooden dowel rod to tap it through. Won't hurt a thing. They are plastic but use lead shot to dampen the rebound from striking hard surfaces. |
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