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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel diameters and muzzle brakes.
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<blockquote data-quote="Clark" data-source="post: 953972" data-attributes="member: 6600"><p>It is getting harder to find the old internet, but here is an artifact</p><p><a href="https://groups.google.com/forum/#!msg/rec.guns/yGNAQRhJLVA/R7MsDyb-S64J" target="_blank">https://groups.google.com/forum/#!msg/rec.guns/yGNAQRhJLVA/R7MsDyb-S64J</a></p><p></p><p>I had a lot of complaints that posters did not believe the handi rifle was a strong as I said it was, so I did an overload work up to verify it.</p><p></p><p><em>Here is my test data:</em></p><p><em>45/70 work up with; 405 gr cast with lube bands, CCI 200 primers, Win</em></p><p><em>brass, old Unique [dirty] powder, chamber well lubricated between</em></p><p><em>firings with CLP for max bolt thrust.</em></p><p><em></em></p><p><em>Quickload calculation of pressure and velocity with 405 gr, Unique</em></p><p><em></em></p><p><em>shot 1) 18 gr, 33,217psi, 1403 fps, primer looks fine.</em></p><p><em>shot 2) 20 gr, 39,435 psi, 1485 fps, primer is fine</em></p><p><em>shot 3) 22 gr, 46,133 psi, 1563 fps, primer looks flat.</em></p><p><em>shot 4) 24 gr, 53,334 psi, 1637 fps, primer is flat.</em></p><p><em>shot 5) 26 gr, 61,067 psi, 1709 fps, primer is top hat and flowing,</em></p><p><em>action popped open and case ejected on firing</em></p><p><em>shot 6) 28 gr, 69,366 psi, 1778 fps, primer is top hat and flowing, case</em></p><p><em>head expansion .001", action popped open and case ejected on firing</em></p><p><em>shot 7) 30 gr, 78275 psi, 1846 fsp, case head expansion .0015" action</em></p><p><em>popped open and case ejected on firing, some leading in the muzzle.</em></p><p><em>shot 8) 32 gr, 87,841 psi, 1911 fps, case head expansion .0025", case head separating where case head is flowing into the extractor, action popped open, some leading in the muzzle, and case ejected on firing, primer is spreading out .010"</em></p><p><em></em></p><p><em>There was no change in headspace, but I had to stop the work up because of case head separation where the case head flowed into the extractor.</em></p><p></p><p>Years later Marlin bought NEF and H&R and answered the question, "Is the 45/70 handi rifle a the trapdoor level, the lever action level, or the Ruger #1 level?"</p><p></p><p>Marlin answered that the 45/70 handi rifle is at the lever action level of pressure capability.</p><p></p><p>What does it all mean?</p><p>My Handi rifle math was not convincing.</p><p>My handi rifle test data was not convincing.</p></blockquote><p></p>
[QUOTE="Clark, post: 953972, member: 6600"] It is getting harder to find the old internet, but here is an artifact [url]https://groups.google.com/forum/#!msg/rec.guns/yGNAQRhJLVA/R7MsDyb-S64J[/url] I had a lot of complaints that posters did not believe the handi rifle was a strong as I said it was, so I did an overload work up to verify it. [i]Here is my test data: 45/70 work up with; 405 gr cast with lube bands, CCI 200 primers, Win brass, old Unique [dirty] powder, chamber well lubricated between firings with CLP for max bolt thrust. Quickload calculation of pressure and velocity with 405 gr, Unique shot 1) 18 gr, 33,217psi, 1403 fps, primer looks fine. shot 2) 20 gr, 39,435 psi, 1485 fps, primer is fine shot 3) 22 gr, 46,133 psi, 1563 fps, primer looks flat. shot 4) 24 gr, 53,334 psi, 1637 fps, primer is flat. shot 5) 26 gr, 61,067 psi, 1709 fps, primer is top hat and flowing, action popped open and case ejected on firing shot 6) 28 gr, 69,366 psi, 1778 fps, primer is top hat and flowing, case head expansion .001", action popped open and case ejected on firing shot 7) 30 gr, 78275 psi, 1846 fsp, case head expansion .0015" action popped open and case ejected on firing, some leading in the muzzle. shot 8) 32 gr, 87,841 psi, 1911 fps, case head expansion .0025", case head separating where case head is flowing into the extractor, action popped open, some leading in the muzzle, and case ejected on firing, primer is spreading out .010" There was no change in headspace, but I had to stop the work up because of case head separation where the case head flowed into the extractor.[/i] Years later Marlin bought NEF and H&R and answered the question, "Is the 45/70 handi rifle a the trapdoor level, the lever action level, or the Ruger #1 level?" Marlin answered that the 45/70 handi rifle is at the lever action level of pressure capability. What does it all mean? My Handi rifle math was not convincing. My handi rifle test data was not convincing. [/QUOTE]
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