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Rifles, Reloading, Optics, Equipment
Gunsmithing
Mauser Actions with Lug Abutment Setback
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<blockquote data-quote="AkleyFan" data-source="post: 2698493" data-attributes="member: 114323"><p>OK - I'm feeling like the setback is less a concern if you are - ultimately - going to re-carburize the action. I appreciate your point regarding lapping. Partial lapping to smooth the surfaces with a "sacrificial" or single purpose bolt prior to re-carburizing seems like a worthwhile practice as I can then final lap with the bolt I'm go to finish the build with, and not worry too much about over lapping the engagement surfaces of each. I have a few bolts in the parts drawer that I could use for this operation.</p><p></p><p><u>Side Note:</u> 3 years ago now I built a .308 Win on a VZ-24 action. I was curious to know if the recommendation of lug lapping to approx. 80% engagement contributed to accuracy - nothing else, so I decided to conduct a simple test. My test consisted of 1 military, 3 Interams and 1 Parker Hale bolt that were not lapped to the action and had varying degrees of lug engagement, some as low as 40%. </p><p></p><p>Each bolt headspaced properly and all loads were the same - my go-to California hunting load of Hornady cases filled with 45gr of RL15 and a 150gr TSX @ 2.810" (I correct bullet runout to .002" or less) - it shoots sub-MOA in the 7 rifles that I load for. </p><p></p><p>The results of the test: there was no change in bullet impact @ 100 yards among any of the bolts I used. I found that very interesting. I can see where lapping the lug surfaces is beneficial in other areas, so not looking to stir the pot, just to share this observation.</p></blockquote><p></p>
[QUOTE="AkleyFan, post: 2698493, member: 114323"] OK - I'm feeling like the setback is less a concern if you are - ultimately - going to re-carburize the action. I appreciate your point regarding lapping. Partial lapping to smooth the surfaces with a "sacrificial" or single purpose bolt prior to re-carburizing seems like a worthwhile practice as I can then final lap with the bolt I'm go to finish the build with, and not worry too much about over lapping the engagement surfaces of each. I have a few bolts in the parts drawer that I could use for this operation. [U]Side Note:[/U] 3 years ago now I built a .308 Win on a VZ-24 action. I was curious to know if the recommendation of lug lapping to approx. 80% engagement contributed to accuracy - nothing else, so I decided to conduct a simple test. My test consisted of 1 military, 3 Interams and 1 Parker Hale bolt that were not lapped to the action and had varying degrees of lug engagement, some as low as 40%. Each bolt headspaced properly and all loads were the same - my go-to California hunting load of Hornady cases filled with 45gr of RL15 and a 150gr TSX @ 2.810" (I correct bullet runout to .002" or less) - it shoots sub-MOA in the 7 rifles that I load for. The results of the test: there was no change in bullet impact @ 100 yards among any of the bolts I used. I found that very interesting. I can see where lapping the lug surfaces is beneficial in other areas, so not looking to stir the pot, just to share this observation. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Mauser Actions with Lug Abutment Setback
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