Thanks for your compliments. I alter Enfield magazines by cutting the bottom off at the desired angle with a hacksaw, then cleaning up the cut with a platen grinder. After everything is rendered flat and square, I solder an 11ga plate onto the bottom of the magazine. My preferred method is to tin the bottom plate and the magazine separately, then place the bottom plate on blocks and place the magazine on top. Then I heat the whole assembly and allow the magazine to seat itself. After that, its a matter of sawing and grinding off the excess metal and cleaning up the solder fillets. If it is done correctly, the solder joint is very thin and non-obtrusive.

I'm glad you have a milling attachment for your lathe. I have to to my trimming with hacksaw, file and chisel! My method builds muscle and patience in about equal proportions

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I like the idea of a .375 on the No.4 action. How about a cartridge based on the .444 Marlin case? That works well with everything from 7x57R, .308, .311, 8x57R. .338, 9x57R, 9.3x57R, the aforementioned .375 and even a .400. Another thing that I have considered is a .40-65 Win. That is interesting because I already have dies, cases, loaded ammo and even a barrel on hand.

Carpetsahib