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Rifles, Reloading, Optics, Equipment
Gunsmithing
Headspace problem
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<blockquote data-quote="tobnpr" data-source="post: 2598231" data-attributes="member: 68758"><p>Circumference = 80 mm</p><p>Movement= 3 mm = .0375 of full revolution</p><p>Tenon thread pitch 16 tpi, .0625 x .0375= .0023</p><p></p><p>So, you're only a couple of thou short. You might be able to bump shoulders to that- maybe not; set up your press for hard cam-over to see if it works. Commercial dies are manufactured to tight tolerances so that some idiot doesn't oversize to a point of safety hazard. Factory ammo is usually (but not always) well undersized and may chamber. Post above (grinding/sanding die base) is one solution if needed.</p><p></p><p>If you've never lapped the lugs on the TIkka it might be a good opportunity for that- you may be able to obtain better lug contact and pick up the couple thou to get you to "go". Just be sure to keep checking to be sure you don't overhsoot.</p><p>Also, how much torque did you use with the action wrench? If you didn't use at least 60-75 ft lbs you could also pick it up this way.</p><p></p><p>Under no circumstances would I suggest you try to hand ream that chamber .002 deeper, the risk isn't worth it. If you overshoot, it will need to go to a gunsmith to be set back.</p><p></p><p>There's no problem with you leaving it where it is, provided you can get your shoulders bumped where you need it. If you decide to play with this more, headspace should always be checked with a stripped bolt, it's a matter of "feel". Lap the lugs until the bolt handle just barely falls on it's own (fully in battery)</p></blockquote><p></p>
[QUOTE="tobnpr, post: 2598231, member: 68758"] Circumference = 80 mm Movement= 3 mm = .0375 of full revolution Tenon thread pitch 16 tpi, .0625 x .0375= .0023 So, you're only a couple of thou short. You might be able to bump shoulders to that- maybe not; set up your press for hard cam-over to see if it works. Commercial dies are manufactured to tight tolerances so that some idiot doesn't oversize to a point of safety hazard. Factory ammo is usually (but not always) well undersized and may chamber. Post above (grinding/sanding die base) is one solution if needed. If you've never lapped the lugs on the TIkka it might be a good opportunity for that- you may be able to obtain better lug contact and pick up the couple thou to get you to "go". Just be sure to keep checking to be sure you don't overhsoot. Also, how much torque did you use with the action wrench? If you didn't use at least 60-75 ft lbs you could also pick it up this way. Under no circumstances would I suggest you try to hand ream that chamber .002 deeper, the risk isn't worth it. If you overshoot, it will need to go to a gunsmith to be set back. There's no problem with you leaving it where it is, provided you can get your shoulders bumped where you need it. If you decide to play with this more, headspace should always be checked with a stripped bolt, it's a matter of "feel". Lap the lugs until the bolt handle just barely falls on it's own (fully in battery) [/QUOTE]
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Headspace problem
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