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by mtngun
Thu Feb 01, 2018 2:00 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

Re: S & W N-frame Project

Getting back to the alloy shootout .... Coated air-cooled reclaimed shot. As discussed in the previous post I decided to tweak the powder charge to hit 1370 fps, so these loads used 15.4 gr. WC297 instead of the usual 15.6 gr.. FYI Quickload believes that 25,000 psi is required to hit 1370 fps, so t...
by mtngun
Thu Feb 01, 2018 1:39 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

Re: S & W N-frame Project

Getting back to the hollow point shootout ...... The HP'd uncoated bullet shot very well so I had high hopes for the coated version. This was quenched after coating so the BHN was about 25. https://imgur.com/mcRluCX.jpg Accuracy was not so great, mainly due to a single flier. If you disregard the fl...
by mtngun
Thu Feb 01, 2018 1:09 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

Re: S & W N-frame Project

A new cavity, cut exactly the same as the 183 gr. BB control bullet except for a smaller meplat. This way, if it shoots different we'll know it's due to the meplat and not due to something else. https://imgur.com/wO3NRTc.jpg Aaaaand .... the 50% meplat was less accurate, 6.38" vs ~3.5" for...
by mtngun
Thu Feb 01, 2018 6:42 am
Forum: alloys
Topic: Used Type Metal
Replies: 0
Views: 596

Used Type Metal

I view type metal as a beginner's alloy and no longer use it except in my alloy shootouts. There are many flavors of type metal, and furthermore their composition may change in use as the metal gets "burnt out," so if you buy used type metal you may not be 100% sure what you're getting. Wi...
by mtngun
Wed Jan 31, 2018 4:34 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

Re: S & W N-frame Project

I'm glad you enjoy reading about my adventures, Joe4065. I've been casting for 36 years and I'm still learning new stuff. That's what makes it interesting.
by mtngun
Wed Jan 31, 2018 9:24 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

Re: S & W N-frame Project

I recut the boat tail cavity to a bevel base. https://imgur.com/akzfKgb.jpg The bevel base version of the "silhouette" bullet was not as inaccurate as the boat tail, but it was still inaccurate. A switchy 5 - 10 mph wind did not help, nonetheless there was no hint that the bullet wanted to...
by mtngun
Tue Jan 30, 2018 6:19 am
Forum: design & sizing
Topic: Crimp grooves
Replies: 1
Views: 555

Re: Crimp grooves

No. Most double crimp grooves are too small.
by mtngun
Mon Jan 29, 2018 11:24 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

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. Her...
by mtngun
Mon Jan 29, 2018 11:05 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 107
Views: 11803

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: 11803

Re: S & W N-frame Project

Go right ahead, Lee.

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