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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fire Lapping a Barrel
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<blockquote data-quote="J E Custom" data-source="post: 798915" data-attributes="member: 2736"><p>I have done more than 50 RUMs and they always show great improvement in SDs, ES and accuracy and it takes 2 more grs of powder to get back to the previous max pressure but with increased velocity. Don't let anyone tell you the don't work or that they harm your bbl because if you do it right you will be happy!! ---- RHB</p></blockquote><p></p><p>I agree to disagree with this and I will tel you why.</p><p></p><p>I have only done 1 and that was enough for me. I have hand lapped lots of barrels when they had poor </p><p>accuracy. One barrel was so bad I figured, what did I have to lose because the next step was </p><p>to replace it (It would not shoot less than 5" groups at 100 yards ). I throughly inspected it with the bore </p><p>scope so I could compare the results and even cast a broach to check the bore size after the </p><p>fire lapping. </p><p></p><p>Having this barrel to sacrifice if I couldn't,t fix it, I followed the instructions to the letter and waited </p><p>5 min between shots to give the barrel time to cool down.</p><p></p><p>After completing the fire lapping and still at the range and good cleaning, I fired the best loads I had </p><p>for it before it was fire lapped and it did improve to around 3'' groups and it did drop in velocity.</p><p>It was better in every way but it was still not good enough to save the barrel from being used as </p><p>a tomato stake.</p><p></p><p>After getting it back in my shop and inspecting it again with the bore scope most of the machine marks </p><p>were gone from the throat end but very little had been changed on the muzzle end.</p><p></p><p>Inserting the broach I cast earlier I found slight resistance at the muzzle but none at the chamber </p><p>end. Not wanting to give up on the fire lapping I cast a broach at 1" from the chamber end and </p><p>that's when I decided never to use that system on any rifle that was to be used for more than 100 </p><p>to 200 yards because of bore taper. the lap would not go but 4" or 5" toward the muzzle .The only</p><p>thing that helps is the fact that as the bullet moves down the barrel it gets tighter.</p><p></p><p>On this site everyone worries about barrel life and this method has to take several hundred rounds</p><p>off the barrel life (Lower velocity and 2 or 3 more grains of powder to regain the velocity, only</p><p>enforces the end results) .A tight, smooth barrel normally increases velocity.</p><p></p><p>I would never tell anyone that they shouldn't do something, I just tell what I have seen and prov en</p><p>to my self and if they chose to do something else good luck to them.</p><p></p><p>My test was a worst case scenario and with a better barrel I am sure the results would be better from </p><p>an accuracy standpoint but to purposely remove several hundred rounds of barrel life from a barrel</p><p>just doesn't makes sense especially on one that shoots well, but fouls after 2 or 3 shots.</p><p></p><p>This is just My experience with this system and the explanation for the reason that I don't recommend it.</p><p></p><p> Nothing personal. </p><p></p><p>J E CUSTOM</p><p>[/QUOTE]</p>
[QUOTE="J E Custom, post: 798915, member: 2736"] I have done more than 50 RUMs and they always show great improvement in SDs, ES and accuracy and it takes 2 more grs of powder to get back to the previous max pressure but with increased velocity. Don't let anyone tell you the don't work or that they harm your bbl because if you do it right you will be happy!! ---- RHB[/QUOTE] I agree to disagree with this and I will tel you why. I have only done 1 and that was enough for me. I have hand lapped lots of barrels when they had poor accuracy. One barrel was so bad I figured, what did I have to lose because the next step was to replace it (It would not shoot less than 5" groups at 100 yards ). I throughly inspected it with the bore scope so I could compare the results and even cast a broach to check the bore size after the fire lapping. Having this barrel to sacrifice if I couldn't,t fix it, I followed the instructions to the letter and waited 5 min between shots to give the barrel time to cool down. After completing the fire lapping and still at the range and good cleaning, I fired the best loads I had for it before it was fire lapped and it did improve to around 3'' groups and it did drop in velocity. It was better in every way but it was still not good enough to save the barrel from being used as a tomato stake. After getting it back in my shop and inspecting it again with the bore scope most of the machine marks were gone from the throat end but very little had been changed on the muzzle end. Inserting the broach I cast earlier I found slight resistance at the muzzle but none at the chamber end. Not wanting to give up on the fire lapping I cast a broach at 1" from the chamber end and that's when I decided never to use that system on any rifle that was to be used for more than 100 to 200 yards because of bore taper. the lap would not go but 4" or 5" toward the muzzle .The only thing that helps is the fact that as the bullet moves down the barrel it gets tighter. On this site everyone worries about barrel life and this method has to take several hundred rounds off the barrel life (Lower velocity and 2 or 3 more grains of powder to regain the velocity, only enforces the end results) .A tight, smooth barrel normally increases velocity. I would never tell anyone that they shouldn't do something, I just tell what I have seen and prov en to my self and if they chose to do something else good luck to them. My test was a worst case scenario and with a better barrel I am sure the results would be better from an accuracy standpoint but to purposely remove several hundred rounds of barrel life from a barrel just doesn't makes sense especially on one that shoots well, but fouls after 2 or 3 shots. This is just My experience with this system and the explanation for the reason that I don't recommend it. Nothing personal. J E CUSTOM [/QUOTE]
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