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Old 03-03-2020, 07:34 AM   #1
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Revolver cylinder throats

I just bought a 3 inch K6s, and as I intend to shoot cast bullets in it, I measured the cylinder throats. I was surprised to see that they measured .360. Has anyone shot cast loads extensively? Any leading with such large throats?



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Old 03-03-2020, 08:50 AM   #2
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Welcome to the forum longbowman99, how about stopping by our "New Member Introduction" sub forum and introducing yourself to the membership. Tell us something about yourself, your interests, hobbies and where your located.
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Old 03-03-2020, 10:07 AM   #3
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Old 03-03-2020, 11:12 AM   #4
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Originally Posted by longbowman99 View Post
Any leading with such large throats?
As a long time bullet caster/handloader, I'd say "yes", that sounds like a leading invitation. But before I was to launch any cast bullet loads from that revolver downrange, a call to Kimber CS would be in order to hear their 'logic' for such oversize cylinder throats.

None of my Smiths in .38/.357 have throats anywhere near that large.

Oh, and welcome to the forum. Let us know how this shakes out once resolved.
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Old 03-03-2020, 03:38 PM   #5
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Well, that was interesting! I called support to ask if .360 cylinder throats was within their tolerances, and the first “tech” thought I was trying to figure out how many cartridges it would hold. I politely asked to speak with someone familiar with revolvers.

The next one made me feel like I was asking for the nuclear launch codes. I finally convinced her all I wanted was a yea or nay on that one dimension; did my gun need to be corrected.

After a call back, I was informed that .360 is within their specs. Doesn’t sound too cast bullet friendly. Lyman does make a sizer in that diameter, and I can get custom moulds.
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Old 03-03-2020, 04:06 PM   #6
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longbow: Just out of curiosity, I mic'd some of my S&W .38's and .357's to see exactly what the throat dimension actually was, as it's been a while since I've measured them.

They all mic right at .3565". I shoot mostly cast bullets in these two calibers, and leading has never been an issue with the Lyman No. 2 alloy I use.

I still feel that .360" is excessive. Smith has been building revolvers just a tad longer than Kimber. Think they're aware of something Kimber isn't? You may want to invest in a Lewis Lead Remover if you don't already have one in case you still get leading. A proper custom mould may solve it; hope so.
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