Quote:
Originally Posted by Paul Harm
Ron, I've never had any luck with nitro powders in the Magtechs. My Accurate powder reloading booklet has an article about the importance of crimps and how they effect pressure. There isn't much resistance by gluing OS cards in compared to a fold or roll crimp. I sold 300 Magtechs after trying to get good loads with smokeless. I believe Charlie has had some success with them. Let us know if you find a way to use them with nitro powders.
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Thanks for the help, Paul. What year/issue is you accurate arms reloading booklet? I'd like to read the article. Your explanation regarding crimp pressure makes sense and might explain my results: I loaded and fired 10 new brass hulls (ordered 50 from Track of the Wolf -- "The head is engraved Parker Brothers Meriden, Conn. - 10 gauge A markings for a historic appearance.") with 34 grains of Longshot, and 1 5/8 oz #7 1/2 chill. This load is listed on the Short Ten Reloading Spreadsheet showing only 5700 psi. Of the 10 that I shot 3 cracked.
I don't believe the fault is the hull as I have used these same brass hulls for repeated reloadings and firings of pretty heavy loads of black powder and have never cracked a hull.
The shots that I fired all felt and sounded normal -- and actually seemed mild compared to the black powder loads. You would think that the fact that "there isn't much resistance by gluing OS cards in compared to a fold or roll crimp" that the pressure would be even lower than 5700 psi. So it's a mystery to me why the hulls cracked -- perhaps without sufficient resistance the pressure curve moved higher up the case? Regardless of the cause I will not be wasting any more hulls at $7.50 per using them with that load again. It would be interesting to know if anyone else has had a similar experience.
At this point I think I will save the brass hulls for vintage shoots and black powder loads (which are a lot of fun to shoot) and buy a few boxes of RSTs for hunting.
Maybe at some point I'll experiment with trying to increase the resistance of the over shot wad by using a thicker card more solidly glued in. But's hard to believe a crimped plastic hull offers much resistance in comparison to the force required to push the entire payload from a dead stop to 1100 fps... Maybe the article you mentioned has an explanation?
Thanks again -- I'll share anything else I learn,
Ron