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 Gunsmither or Rifle Wrecker???
 One for the Gunsmiths to ponder...
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Kosh75287
Advanced Member



USA
796 Posts

Posted - Sep 13 2017 :  08:48:24  Show Profile Send Kosh75287 a Private Message  Reply with Quote
Every revolver I've ever checked has a very tight and flush fit between cylinder and forcing cone. Would anything be gained by beveling/ funneling the interior of the forcing cone? I'm sure that if anything is to be gained, the angle would be critical, and I have no idea of which might be best.

I INTUIT that creating a "funnel" in the forcing cone might only increase the effective width of the flash gap toward the interior, and cause a loss of velocity. On the other hand, I'm neither a gunsmith nor a fluid mechanics specialist, so any judgement I make is purely a priori.

If, by some bizarre happenstance, the outer diameter of the forcing cone could be larger than the chamber faces(?) on the cylinder, funneling the forcing cone might actually gain something over (more like not lose as much as) a "flush-fit" flash gap. Don't try to say those last four words fast.

God bless Jeff Cooper

Carpe SCOTCH!

Shastaboat
Advanced Member



USA
9125 Posts

Posted - Sep 13 2017 :  11:19:59  Show Profile Send Shastaboat a Private Message  Reply with Quote
The forcing cone already is a funnel. That said there is a tool for cutting revolver forcing cones. They are available in different degrees.

https://www.midwayusa.com/product/672206/ptg-interchangeable-pilot-revolver-forcing-cone-cutter-5-degree

Edited by - Shastaboat on Sep 13 2017 11:21:30
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WonderMan4
Advanced Member

USA
2851 Posts

Posted - Sep 13 2017 :  14:19:37  Show Profile Send WonderMan4 a Private Message  Reply with Quote
Just widening the forcing cone would do nothing to the cylinder gap.

Makes me wonder though. According to Shasta's link, Ruger is 5 deg, and 18 deg is common to many revolvers.

Might improve cast bullet accuracy by enlarging the forcing cone. Now I gotta do some measuring since the thoughts are mindset now.
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Onondaga
Advanced Member



USA
4017 Posts

Posted - Sep 13 2017 :  15:33:30  Show Profile Send Onondaga a Private Message  Reply with Quote
Kosh75287,

If you have 18 and change to 5 degree taper, you decrease the deceleration breaking effect of the taper and lower recoil. That changes impact point and has the potential to increase accuracy.

Cast bullet accuracy depends, more than anything else, on a verified slide fit to chamber for maximum accuracy potential. That slide fit creates a stable start for cast bullets that is necessary for accuracy with cast bullets and does NOT relate to jacketed bullets.

If you are going to shoot cast bullets in a revolver, you have to control bullet diameter for a verified slide fit to chamber or you decrease accuracy potential. This requires an as cast bullet diameter that shows a slide fit or a sized bullet diameter that shows a slide fit. Less than a verified slide fit decreases accuracy potential and increases leading potential.

Gary

Fine rifles are never really owned.
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Kosh75287
Advanced Member



USA
796 Posts

Posted - Sep 13 2017 :  16:11:47  Show Profile Send Kosh75287 a Private Message  Reply with Quote
Thanks, Gents! Good info!

God bless Jeff Cooper

Carpe SCOTCH!
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