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Post by squawberryman on Mar 25, 2015 18:38:48 GMT -5
Am I the only one wondering why Dan Wesson fired a zero barrel 44? Please advise Mr. Bradshaw.
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Post by bradshaw on Mar 25, 2015 20:17:02 GMT -5
squawberryman..... by "zero barrel 44," do you mean firing Dan Wesson WITHOUT barrel screwed to frame? Experiment was to see what would happen. Torture is a legitimate aspect of development. Way it was described to me, the base of the bullet accelerates faster than the nose. Pressure on bullet plenty stout at that point. Good reason to guide the heel as shoulder enters rifling. David Bradshaw
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Paden
.375 Atomic
Lower Goldstream Creek
Posts: 1,132
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Post by Paden on Mar 25, 2015 21:02:44 GMT -5
Not sure it's a matter of base accelerating faster than nose, so much as a function of propulsion from the rear in opposition with resistance from the front. Same physics that causes the back end of a rear wheel drive vehicle to want pass the front end... Axial rotation being the force vector which helps to overcome this propensity, no?
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Post by bradshaw on Mar 26, 2015 1:28:29 GMT -5
paden.... base accelerates faster than nose; probably true for a few atoms of a second. Extreme obturation commences as bullet base exits cylinder. Cannot verify, since I never shot a Dan Wesson with the barrel removed.
Back to the 11-degree forcing cone. Done in the traditional short smooth way, it works. Assume zero chamber-to-bore runout, and a tiny forcing cone is plenty. Cut to a given base diameter, a 5-degree cone is longer than an 11-degree cone. Hence, bullet travels farther to engage rifling. As for an 11-degree crown vs a muzzle cut square to the bore, which color do you prefer? Quality trumps theory.
Curious, the "11-degree cone" starts from bore axis, whereas an "11-degree crown" starts square to the bore. David Bradshaw
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Post by squawberryman on Mar 26, 2015 6:22:31 GMT -5
What I envisioned is a gun with NO barrel. Do you mean a gun with the barrel just turned out a couple of threads? That I understand
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Post by bradshaw on Mar 26, 2015 6:49:43 GMT -5
squawberryman.... we refer to firing a full house magnum from cylinder alone, barrel removed from frame. Again, I never tried it, and am not in a hurry now. David Bradshaw
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Post by whiterabbit on May 18, 2015 17:48:43 GMT -5
I can't add much to David's response. That's about as dead-on correct as you'll get. To echo his comments, there are four things we strive for in a forcing cone: 1) Centered on the bore 2) Concentric 3) Short 4) Smooth / polished We typically cut elevens, but if you have the aforesaid, the angle is less critical (assuming it's a reasonable transition, say 5 to 12 degrees). Here's one of ours on a 0.512" blank: Centering the bore off the grooves, not the lands: Boring bar set to eleven degrees: Cut and polished 11 degree cone. Notice the length? -Lee www.singleactions.com"Building carpal tunnel one round at a time" Hi Lee,
When you set your barrels up in the lathe, what is the tolerance you dial in the barrel?
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