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by mtngun
Sun Dec 10, 2017 6:08 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

The various 180 gr. GC's have been the most reliable peformers in this gun, so surely I can find a pet load for it? 15.6 gr. WC297, CCI 550, R-P cases -- 6 in 5.8" :cry: , 1357 fps, 51 ES. 15.9 gr. WC297, CCI 550, R-P cases -- 6 in 6.2" :cry: , 1376 fps, 83 ES. That taught me that somethin...
by mtngun
Sun Dec 10, 2017 5:49 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Next, trying different powders and powder charges with the revised 180 gr. BB Trying a lighter charge of WC297. Something seems wrong because I used to get 4" groups with the coated 180. :x https://imgur.com/3cjPtVl.jpg I rarely use 4227 in revolvers because other powders give better velocity. ...
by mtngun
Sun Dec 10, 2017 5:41 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Today's target was very messy and the results were dissappointing so I'm only going to post the highlights and what it taught me. I'll break into a seperate post for each bullet. I wanted to retest the coated 140 gr. gas check, but only had enough coated bullets for one group, so first I used uncoat...
by mtngun
Sun Dec 10, 2017 1:50 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Expansion. Given enough velocity and given a big enough meplat to help initiate expansion, even hard bullets will expand. The expansion that I see in the water tank is similar to bullets that I recover from game. Exception being lung shots that don't hit anything solid. A hard cast bullet typically ...
by mtngun
Sun Dec 10, 2017 1:39 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Today I tried various powder tweaks and got the usual uninspiring 4" - 6" groups. :oops: :cry: :twisted: I'll post the boring deets later. Right now let's look at the water tank results with the "revised" bullet designs having more and bigger grooves on the front end. The more an...
by mtngun
Sat Dec 09, 2017 7:47 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Trying some slightly different bullet designs. Based on the results of the water tank tests I eliminated the bore riding bands and put more and bigger grooves on the top half of the bullet. First up, a 190 gr. GC. The 0.090" long crimp groove is overkill for crimping, but it is intended to also...
by mtngun
Sat Dec 09, 2017 8:44 am
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Have you considered firing groups using only one of the chambers that does line up well? Alignment or lack thereof is similar on all chambers, differing by perhaps 0.001" or so. https://imgur.com/qDieXSi.jpg This exercise made me recall my experiences with Dan Wesson revolvers back in the 1980...
by mtngun
Sat Dec 09, 2017 8:16 am
Forum: revolvers
Topic: 300MP vs WW296 vs WC297 vs H110
Replies: 4
Views: 145

Re: 300MP vs WW296 vs WC297 vs H110

Thanks for the data, Ussrsnpr. :)
by mtngun
Thu Dec 07, 2017 6:08 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

The deformation on one side being more severe than the other is something I know well! I've now seen enough of these to be confident that the uneven engraving is due to barrel/cylinder mis-alignment. Hard to say about bullet design. Cast bullets don't always behave the way we think they should beha...
by mtngun
Thu Dec 07, 2017 1:28 pm
Forum: revolvers
Topic: S & W N-frame Project
Replies: 81
Views: 2329

Re: S & W N-frame Project

Before doing the water tank tests, I had re-cut one of the bore riding bands on the 190 gr. GC Loverider. The water tanks tests taught me that, as it turned out, I re-cut the wrong band. Oops! :oops: Oh well, as long as it is here I might as well try it. https://imgur.com/m4OMiIJ.jpg To deal with th...

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