Forcing Cone Depth and Bullet Weight

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Keep Trying posted this 3 weeks ago

Is it better for the base of a revolver bullet, (.38/.357) cast or jacketed. To drop all the way into the forcing cone or to protrude some so that the base of the bullet is still in the cylinder when the front contacts the rifling?

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Keep Trying posted this 3 weeks ago

The best bullet length is what I'm wondering about.

If the base of a 158 grain bullet  protrudes slightly from the forcing cone when the front part is touching the rifling then a 90/140 grain bullet seems like it would have massive gas blow by due to the lighter bullet "rattling around" before it contacts the rifling.

This would seem inefficient or possibly harmful. But I'm not sure. 

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Duane Mellenbruch posted this 3 weeks ago

That blow by is going to take place as soon as the bullet leaves the cylinder and is controlled by the cylinder/barrel gap as the bullet continues down the length of the barrel.  From  your question, I gather that you are concerned about the distance the bullet travels from the cylinder to the beginning of the forcing cone.  Your bullet selection (RN, SWC, WC) will resolve that question.  

Does your bullet selection actually lack any support while moving from cylinder to lands of the barrel, or is this a perceived issue?  

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Tom Acheson posted this 3 weeks ago

I own (5) revolvers and often think about the 11 degree forcing cone improvement noted by Aaron. S&W Model 10 .38 S&W Model 25-2 .45 S&W Model 58 .41 S&W Model 57 .41 Dan Wesson 414 Super Mag Barrel lengths are 4”, 6 1/2”, 8 3/8” and 10 1/2”.

Often wonder if the “cone cutting” gizmo would work on all of them?

Tom

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TRKakaCatWhisperer posted this 3 weeks ago

Agree, B's 11d taper tool is excellent!

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Tom Acheson posted this 3 weeks ago

Nice photos, Aaron, thanks!

Would it be detrimental to use it on a S&W double action?

Tom

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Keep Trying posted this 3 weeks ago

Arron... It's the lighter bullets at any velocity that I'm concerned about.

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Keep Trying posted this 3 weeks ago

Duane... I can tell that the lighter bullets actually lack support when I drop them in the back of some revolver barrels. The base of the bullets are below the rear face of the barrel before the front of the bullet touches the rifling. And there is some side to side play. That's what I mean by rattling around.

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TRKakaCatWhisperer posted this 3 weeks ago

On the large bore S&W revolvers, there is probably enough meat on the forcing cone to cut an 11 degree to assist with CAST bullets.
YES, worked well on my 357's and 44's.

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