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Old November 12, 2012, 10:15 PM   #15
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Join Date: May 17, 2012
Posts: 1,084
Which I think reason enough to stick to SAAMI .45-70 (if it will fit the action).
Or is a 405 at 1700+ insufficient?
Well, it's good to know what the limits of a conversion are, especially when loads are as variable/poorly defined as many of the "modern" .45-70s. I'd hate to rechamber a rifle that could hurt someone with an otherwise safe/common loading. It's comforting to know your 45-70 rifle can also safely shoot full-on 50AK . I'll most likely never shoot the thing anywhere near max simply due to the pain, unless there's a pad out there made of magic or something

At any rate, the reason I opened this thread was to see if I was approaching the bolt-load question from the proper scientific perspective, or if I was totally off base. I appears I'm on the right track; asking the right questions, anyway.

If there is a reliable way to calculate case-friction, someone let me know. I'll bet it's more important in the current chambering at 50,000psi than down around 30000psi, and I need to know if lowering the pressure could actually increase the bolt thrust .

Also, how much force can a cartridge carry before it simply blows out to fill the chamber (stretch or case head separation)?

*Unrelated question: have any of you Contender/Handirifle guys experimented with Sptizer (not rubber-tip FTX) bullets in the 45-70? Does it work, or is performance the same? Would weird barrel twist be needed? I ask because 45-70 is a good deal shorter than the original round, and is in a box magazine; so I'd have more options than the lever guys .
"I don't believe that the men of the distant past were any wiser than we are today. But it does seem that their science and technology were able to accomplish much grander things."
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