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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lapping A Barrel
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<blockquote data-quote="Capt RB" data-source="post: 1787942" data-attributes="member: 85987"><p>I push a lead pistol bullet or 3 through the bore using a wood dowel for my lapping lead. The lapping rod is marked with painters tape so the bullet is still completely in the bore at the muzzle. I then draw it out the chamber marking the rod as it gets to the leade chamber area. Marking the rod to start the lead lap on the same groove then I divide the area so I have 3 distinct sections. I will make a pass to find any tight spots with the muzzle indicating tape 1/2" short of the mark. I start at 800grit It usually will be 1-3 passes. Once the tight spot(s) feel the same as the rest I will then take out that bullet/lead lap and thoroughly clean first by flooding with brakleen or carb cleaner then hoppe's 9. Then I will take bullet 2 and mount to my lapping rod and apply 1200. Start it in from the chamber end same groove as marked. Now the front of the tape marks the leade angle so mark halfway on that piece of tape with a sharpie. Do not come out past that till done. First 10 strokes forward and back from your sharpie mark to the first of 3 pieces of tape on your rod. Once done remove reapply grit and reinsert on that same groove. 10 strokes from the marker to the second piece of tape. Remove reapply reinsert and make 5 passes from the marker spot to 1/2" of your muzzle indicating tape. You have now lapped in the proper taper to your bore. Remove the lap at the chamber flood and clean. I see 100 to sometimes 130fps gains over not doing this. When done right you can pull a vacuum with cotton patch when you put your finger over the muzzle and drag a snug patch back through the bore.</p><p>Now all you have to do is shoot in the throat and it should clean really easy. Every 100 rounds I will either run a tubbs tms bullet or some JB on a lead lap to keep the throat smooth.</p><p> Does it work? My 308 has 4331 rounds through it. I can still shoot 1/2"300 yard groups with different weight bullets. Has it lost some accuracy IDK the loose nut behind the trigger sure but I cannot say for certain the rifle has? When I'm shooting well sub inch 500yd groups of 5 or more is fairly easy. It still shoots 175fgmm and hornady 178bthp into a hole at 100yds.</p></blockquote><p></p>
[QUOTE="Capt RB, post: 1787942, member: 85987"] I push a lead pistol bullet or 3 through the bore using a wood dowel for my lapping lead. The lapping rod is marked with painters tape so the bullet is still completely in the bore at the muzzle. I then draw it out the chamber marking the rod as it gets to the leade chamber area. Marking the rod to start the lead lap on the same groove then I divide the area so I have 3 distinct sections. I will make a pass to find any tight spots with the muzzle indicating tape 1/2" short of the mark. I start at 800grit It usually will be 1-3 passes. Once the tight spot(s) feel the same as the rest I will then take out that bullet/lead lap and thoroughly clean first by flooding with brakleen or carb cleaner then hoppe's 9. Then I will take bullet 2 and mount to my lapping rod and apply 1200. Start it in from the chamber end same groove as marked. Now the front of the tape marks the leade angle so mark halfway on that piece of tape with a sharpie. Do not come out past that till done. First 10 strokes forward and back from your sharpie mark to the first of 3 pieces of tape on your rod. Once done remove reapply grit and reinsert on that same groove. 10 strokes from the marker to the second piece of tape. Remove reapply reinsert and make 5 passes from the marker spot to 1/2" of your muzzle indicating tape. You have now lapped in the proper taper to your bore. Remove the lap at the chamber flood and clean. I see 100 to sometimes 130fps gains over not doing this. When done right you can pull a vacuum with cotton patch when you put your finger over the muzzle and drag a snug patch back through the bore. Now all you have to do is shoot in the throat and it should clean really easy. Every 100 rounds I will either run a tubbs tms bullet or some JB on a lead lap to keep the throat smooth. Does it work? My 308 has 4331 rounds through it. I can still shoot 1/2"300 yard groups with different weight bullets. Has it lost some accuracy IDK the loose nut behind the trigger sure but I cannot say for certain the rifle has? When I'm shooting well sub inch 500yd groups of 5 or more is fairly easy. It still shoots 175fgmm and hornady 178bthp into a hole at 100yds. [/QUOTE]
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Lapping A Barrel
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