Need Advice Loading for M71 & M71/84
Hi All,
I was lucky to have acquired an M71 and M71/84 many years ago and started loading for the 71/84 using Pyrodex. My interests turned elsewhere and these rifles have sat unused for quite some time. However, recently while looking back in my reloading supply stockpile for some primers, I discovered I had an unopened 8lb jug of XMP5744 back there. I have no clue where I got it but from what I've read online, its a good powder for BPCR rifles. So I thought I'd try using it for my M71 & M71/84 and get them shooting again.
For the M71/84, I have the Lyman 446110 (340gr) mold and I recall that shot pretty well using the Pyrodex. However, I never got around to buying a mold for the M71. Looking in my pile of molds I see that I have a Lee 457-500-F as well as the Lee 452-230 RN and 452-230 TC for my .45's. Any thought on whether the bullets from any of these molds would work if I size to .452? My initial thought is that the 500 gr seems a little heavy and the 230gr's seem a little light.
The other alternative I guess would be to paper patch the 446 although its been years since I did any paper patching. I like to tumble lube so I'm guessing I would paper patch first then tumble lube?
Anyway, I would appreciate any thoughts, insight or 5744 load data from the experts.
thanks
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My M71 is a little larger
Slugged the bores of my rifles and the M71/84 mik's out to .446 while my M71 is a .452. So I think I may try some .45 bullets for the M71 if they'll chamber.
I only have 20 pieces of Bertram brass from a long time ago and went into sticker shock when I saw how much they cost now! So, I decided to see if I could form some. From my range pickup scrap bin I found I have some 300 mag brass and went about using them as the base. The big issues were: (1) extraction since the rims are too narrow and (2) headspace since the rims are too thin. So, based on some older threads I found, I tried a few different solutions and ended up with using some 14 gauge solid copper wire in the groove of the 300 mag brass. I tried 16 gauge but it was too thin and wouldn't extract reliably from the 71/84. The 14 gauge is a little too thick so after forming a circle that fit in the groove, I carefully took it off and thinned the top and bottom with the little sanding drum in my dremel. I actually tried to epoxy the rings on to the brass but it didn't take. However after playing around with it for a while, I'm finding that the wire is stiff enough that I don't think it'll slip. Time will tell. The two sample pieces I made up now extract reliably in both rifles and fit in my Lee shellholder just like the Bertram brass that I have. Not sure if I'll have time before the holidays, but I'll load these two pieces up and take them to the range and see how they work out.
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