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by mtngun
Sat Dec 23, 2017 8:11 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Sketch of the "Taylor Junior" currently in the GM barrel.
Image
by mtngun
Sat Dec 23, 2017 5:59 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Testing the two experimental forcing cones. About 20 degrees outside, but warm inside the shooting shack. A bit of mirage but it was barely noticeable with the Weaver scope set at 6X. https://imgur.com/Q5Ba20l.jpg This is the 180 gr. bore riding GC that I mentioned in a previous post. It is a bastar...
by mtngun
Fri Dec 22, 2017 9:14 am
Forum: General
Topic: A Unified Theory of Cast Bullets?
Replies: 5
Views: 517

Re: A Unified Theory of Cast Bullets?

Table shows RPMs for a given velocity and twist.

CYAN = safe RPM's
YELLOW = challenging RPM'S
ORANGE = hold your mouth just right
RED = lotsa luck
.
RPM = 720 x Velocity / Twist

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by mtngun
Wed Dec 20, 2017 3:39 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Recutting the forcing cones in both barrels today. Usually, except for benchrest rifles, I indicate the barrel on a snug fitting gage pin. In theory a snug fitting gage pin's error should be less than 0.001". On expensive benchrest rifle barrels I use a gage pin to do an initial dial-in, then f...
by mtngun
Tue Dec 19, 2017 6:23 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Here's a sketch of the "Taylor Junior" forcing cone, in blue. The red line represents a straight line connecting the beginning and the end of the Taylor Junior cone -- the straight line is approximately 1.5 degree per side, about the same angle as used in many rifle leades. Would a simple ...
by mtngun
Tue Dec 19, 2017 2:24 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Water tank results using 15.6 gr. WC297 for about 1400 fps when the bullet hits the water. Coated and quenched reclaimed shot at ~25 BHN. It so happened that all of today's bullets bounced off the side of the water tank and suffered some damage, but I tried to position the damaged side out of the ph...
by mtngun
Sun Dec 17, 2017 9:30 pm
Forum: design & sizing
Topic: Bullet nose profile for handguns
Replies: 5
Views: 244

Re: Bullet nose profile for handguns

The stability of handgun loads is difficult to predict. Generally, bullets designed for longer ranges have smaller meplats. Take the silhouette bullets, for example. 41% meplat: http://rcbs.com/getattachment/Products/Bullet-Casting/Bullet-Moulds/Silhouette/Bullet-Mould-357-180-SILH-430/rc_dwn_82154....
by mtngun
Sun Dec 17, 2017 12:25 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Continuing to test the No-Name barrel with the "Taylor Junior" throat. All of today's groups were shot with the same coated 180 gr. BB load and new Starline brass, except for 2 groups with annealed R-P brass. Groups #1 and #2 were shot yesterday. Groups #5 and #6 used annealed R-P brass. T...
by mtngun
Sat Dec 16, 2017 4:11 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Same barrel and same loads as last time, only now the barrel has a short Taylor throat aka "Taylor Junior." Average for all 4 groups was 3.76", much better than last time, though no better than this barrel did when it was new. https://imgur.com/L4DLn2c.jpg It takes more than 4 groups ...
by mtngun
Sat Dec 16, 2017 3:36 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 86
Views: 2704

Re: S & W N-frame Project

Some Starline brass showed up for this project. It's uniformity seems run of the mill.
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