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Bullet sizing from .359 mold casting

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Bullet sizing from .359 mold casting Empty Bullet sizing from .359 mold casting

Post by Upper40 Wed Oct 25, 2023 8:04 am

Want to experiment using a 38/357 mold that casts at .359 and using the bullets is a 9mm revolver. Would sizing them to .356 or .357 be acceptable? 

Thanks

Upper40

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Post by bruce martindale Wed Oct 25, 2023 8:16 am

Most US 9mm have .357 groove, check your barrel first

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Post by Upper40 Wed Oct 25, 2023 8:18 am

bruce martindale wrote:Most US 9mm have .357 groove, check your barrel first
Using that Lothar Walther .355 barrel stock,  concerned with the sizing question for now. Thanks

Upper40

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Post by Steve in MI Wed Oct 25, 2023 8:45 am

Should be no problem.  When sizing down just need to retain about .005 lube groove depth.

Steve in MI

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Post by WesG Wed Oct 25, 2023 11:45 am

Cylinder throat diameter is a factor as well. You don't want any clearance there. The barrel will size them down.

Worst case is cylinder throats smaller than the barrel. I've got, or had, a couple like that. 'Lead Mines'.

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Post by NuJudge Wed Oct 25, 2023 12:44 pm

Look at posts #2, 3 & 7 here:  
https://castboolits.gunloads.com/showthread.php?21598-A-beginner-s-guide-to-revolver-accuracy  

The best way to measure revolver cylinder throat diameters is with a pin gauge, which are available.  You will get surprises, most of them unpleasant.

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Post by Upper40 Wed Oct 25, 2023 1:47 pm

NuJudge wrote:Look at posts #2, 3 & 7 here:  
https://castboolits.gunloads.com/showthread.php?21598-A-beginner-s-guide-to-revolver-accuracy  

The best way to measure revolver cylinder throat diameters is with a pin gauge, which are available.  You will get surprises, most of them unpleasant.
RE: My S&W 986 L frame 9mm revolver

My pin gauges indicate .358 cylinder diameter. Replaced the factory 9mm revolver barrel (which are .357/358) with the Lothar Walthers .355 barrel. From what I have been told the Walther designed rifling (.355) will adapt with lead bullets from .355 to .358.  But .001 over bore would be a starting point.

Upper40

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Post by NuJudge Wed Oct 25, 2023 6:56 pm

One more problem I have with one pistol, a 9mm Browning HiPower.  It has a tight chamber, but loose groove diameter.  If I seat a bullet big enough to fill the grooves in a case, the assembled cartridge will not fit in the chamber.  

You can see if this problem exists by slightly belling a fired case, and seeing if a bullet will slip in the case.

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