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Rifles, Reloading, Optics, Equipment
Gunsmithing
mark 5 action mods
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<blockquote data-quote="specweldtom" data-source="post: 436870" data-attributes="member: 2580"><p>Index the 3/16" end mill at the end of the existing slot and then lengthen the slot .330". As JE said, the new end of the slot will be very close to where the bolt steps down to the locking lug area. A 4-flute end mill cuts smoother. It doesn't have to be center cutting either. My mill is a little 2 hp bench mill, so I make 2 passes with slow feed, and plenty of cutting fluid. (The MK V bolts are HARD). I use 2 V-blocks clamped in a heavy milling vise and then clamp the bolt into the V-blocks. Since you're only making a .330" long cut, the V-block horseshoe clamps can be set up to clear the tool holder. It's important to have the bolt rotated correctly and perfectly horizontal, so that you pick up and extend the slot cleanly. I have measured .055" on the slot depth.</p><p></p><p>I would still recommend that if you have access to a MK V in .300 Wby or larger, look at the bolt stop slot on it and take measurements anyway. Can't hurt. </p><p></p><p>I spelled out what I do because it will get you there if you don't have a long slot bolt to compare with.</p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 436870, member: 2580"] Index the 3/16" end mill at the end of the existing slot and then lengthen the slot .330". As JE said, the new end of the slot will be very close to where the bolt steps down to the locking lug area. A 4-flute end mill cuts smoother. It doesn't have to be center cutting either. My mill is a little 2 hp bench mill, so I make 2 passes with slow feed, and plenty of cutting fluid. (The MK V bolts are HARD). I use 2 V-blocks clamped in a heavy milling vise and then clamp the bolt into the V-blocks. Since you're only making a .330" long cut, the V-block horseshoe clamps can be set up to clear the tool holder. It's important to have the bolt rotated correctly and perfectly horizontal, so that you pick up and extend the slot cleanly. I have measured .055" on the slot depth. I would still recommend that if you have access to a MK V in .300 Wby or larger, look at the bolt stop slot on it and take measurements anyway. Can't hurt. I spelled out what I do because it will get you there if you don't have a long slot bolt to compare with. Tom [/QUOTE]
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