Search found 1645 matches

by mtngun
Mon Jan 29, 2018 11:24 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

The Aerodynamics of Revolver Bullets Ross Seyfreid once wrote that the BC of revolver bullets is zero. That's only a slight exaggeration. Even the more streamlined "silhouette" type revolver bullets still have a sucky BC. Combine that with low velocity and you get a lot of wind drift. Here's the dr...
by mtngun
Mon Jan 29, 2018 11:05 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

Here's a goofy bullet design. The nose is similar to the various designs made for IHMSA silhouette, but the base has an 8 degree boat tail. While the boat tail might improve the BC a tiny bit, that's not why I did it. I did it because an 8 degree boat tail is reputed to improve stability in the tran...
by mtngun
Mon Jan 29, 2018 6:21 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

Go right ahead, Lee.
by mtngun
Thu Jan 25, 2018 11:51 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

I should mention that the cavity for the 180 gr. BB control bullet was originally cut to drop out right at 0.358" with reclaimed shot, with the expectation that PC coating would increase the diameter. Now that I am doing some uncoated experiments with other alloys I needed the bullets to drop out a ...
by mtngun
Tue Jan 23, 2018 6:32 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

Some trial and error revealed that air-cooled reclaimed shot bullets would be dinged by a 6-jaw chuck, but water quenched bullets would not be dinged (a 5C collet might work better but I did not have the appropriate collet on hand). So I heat treated the bullets prior to cutting the hollow point. I ...
by mtngun
Mon Jan 22, 2018 7:47 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

While re-reading David Bradshaw's experiments with the "volcano'd" WFN's, I stumbled across this tidbit about the Taylor throat in one of David's pet Ruger 45LC's. Its 0.800" long Taylor freebore strikes me as longer than ideal, however it may have been cut that long to clean up the barrel constrict...
by mtngun
Mon Jan 22, 2018 7:21 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

I have been thinking about why the bullets with the .357" band added to the tip of the ogive did not shoot well. :geek: There are two challenges that any bullet has to overcome. First it must fly straight while passing through the gun. Second, it must fly straight while passing through the air. If i...
by mtngun
Sat Jan 20, 2018 7:17 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

Since the "smooth" version of the control load had shot surprisingly well on January 13, I decided to try a couple more versions of the control load. https://imgur.com/uhPhhbd.jpg The uncoated version of the 180 gr. BB did "OK." If you disregard the one wild flier, the average group drops to 3.53", ...
by mtngun
Sat Jan 20, 2018 6:31 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

A 180 gr. bore-riding bevel base did not do so hot when tested on January 13. One theory was that the bore rider was not making contact with the rifling in the forcing cone, so I recut that cavity to have a 0.357" band on the tip of its nose. That increased the weight to 183 gr. but everything else ...
by mtngun
Sat Jan 20, 2018 6:23 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 25094

Re: S & W N-frame Project

Since the 185 gr. Keith bullet was a dud, I recut that cavity with a band near the tip of the nose, turning it into an "almost wadcutter." The thinking was that the bullet would not have to travel as far to contact the rifling. On the other hand, the aerodynamics would suffer, and that might hurt ac...