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Rifles, Reloading, Optics, Equipment
Gunsmithing
To Remage or not to remage
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<blockquote data-quote="25WSM" data-source="post: 2112747" data-attributes="member: 38048"><p>If you want a zero headspace chamber then a barrel nut prefit will do it. If you want a prefit that has perfect headspace then you can measure your action and send those measurements and get real close. Most 700s are .697 from the bolt face to the receiver front. I haven't seen any more than .003 of of this number unless it was trued up wonky. A prefit for a 700 set .003 long on the chambers should hit sammi spec no problem. If your receiver is .003 short it will be a zero headspace and if your receiver was .003 long you would have a .006 headspace which still falls into acceptable sammi spec. I know the difference between go and nogo is .004 but sammi let's a chamber be up to .010 too deep before it's a do not shoot. Once fire formed and your die set properly it would not even mater. But if you can get your barrel off and have calipers you can give measurements and be very close. Front of receiver to bolt face is most important one. Then to the bolt nose. And then to the front of lugs. With these measurements a smith can do you a prefit that is close to perfect. If your doing a.250 lug you can measure from the lug sitting on the top of the receiver to put your calipers on. If you have an actual depth gauge micrometer it would be better but really a caliper will get you very close. </p><p>I have not seen any accuracy difference in the least. If you don't mind the look of the nut there really isn't any disadvantages either way. But if you are going to take off your factory barrel you need a stout vice and wrench and then they will be good for all your barrel changes. I personally think shoulders are the easier path. Good luck. </p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 2112747, member: 38048"] If you want a zero headspace chamber then a barrel nut prefit will do it. If you want a prefit that has perfect headspace then you can measure your action and send those measurements and get real close. Most 700s are .697 from the bolt face to the receiver front. I haven’t seen any more than .003 of of this number unless it was trued up wonky. A prefit for a 700 set .003 long on the chambers should hit sammi spec no problem. If your receiver is .003 short it will be a zero headspace and if your receiver was .003 long you would have a .006 headspace which still falls into acceptable sammi spec. I know the difference between go and nogo is .004 but sammi let’s a chamber be up to .010 too deep before it’s a do not shoot. Once fire formed and your die set properly it would not even mater. But if you can get your barrel off and have calipers you can give measurements and be very close. Front of receiver to bolt face is most important one. Then to the bolt nose. And then to the front of lugs. With these measurements a smith can do you a prefit that is close to perfect. If your doing a.250 lug you can measure from the lug sitting on the top of the receiver to put your calipers on. If you have an actual depth gauge micrometer it would be better but really a caliper will get you very close. I have not seen any accuracy difference in the least. If you don’t mind the look of the nut there really isn’t any disadvantages either way. But if you are going to take off your factory barrel you need a stout vice and wrench and then they will be good for all your barrel changes. I personally think shoulders are the easier path. Good luck. Shep [/QUOTE]
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