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Rifles, Reloading, Optics, Equipment
Gunsmithing
25-06 to 264 win mag
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<blockquote data-quote="Hugnot" data-source="post: 1989213" data-attributes="member: 115658"><p>Lots of input here.</p><p></p><p>Looking at the receivers for both standard and magnum cartridges, R M77, MKII shows that they are essentially equal in dimension. Ruger/Pine Tree Castings claims they can hold tolerances within .007 for their investment castings. </p><p></p><p>The difference is in the magazine box. The front top (bent in feed lips) of the magnum magazine box measures .805, for the standard magazine box .695 - a big difference of .11 inches. The bottom front(s) of both magazine boxes are much identical, .925 standard, .955 magnum. The lengths are about equal .010 (+-). All this means is that a standard long action M77 MKII will accept a magnum M77 MKII magazine box. Very minor stock work might be involved - like less than 5 minutes.</p><p></p><p>The front of the standard follower measures .680 and the magnum .715. </p><p></p><p>My thinking is that I would need to pay $75 to open up the bolt face, modify the extractor and get a new magazine box and follower for the fatter cartridge. I guess the additional cost would be $110, depending on availability of parts. This is more of an incentive to stay with a .473 cartridge and live with 100 fps or so less velocity. This is why I have 2, 6.5-06 rifles. Just love the cheap brass also.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 1989213, member: 115658"] Lots of input here. Looking at the receivers for both standard and magnum cartridges, R M77, MKII shows that they are essentially equal in dimension. Ruger/Pine Tree Castings claims they can hold tolerances within .007 for their investment castings. The difference is in the magazine box. The front top (bent in feed lips) of the magnum magazine box measures .805, for the standard magazine box .695 - a big difference of .11 inches. The bottom front(s) of both magazine boxes are much identical, .925 standard, .955 magnum. The lengths are about equal .010 (+-). All this means is that a standard long action M77 MKII will accept a magnum M77 MKII magazine box. Very minor stock work might be involved - like less than 5 minutes. The front of the standard follower measures .680 and the magnum .715. My thinking is that I would need to pay $75 to open up the bolt face, modify the extractor and get a new magazine box and follower for the fatter cartridge. I guess the additional cost would be $110, depending on availability of parts. This is more of an incentive to stay with a .473 cartridge and live with 100 fps or so less velocity. This is why I have 2, 6.5-06 rifles. Just love the cheap brass also. [/QUOTE]
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25-06 to 264 win mag
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