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<blockquote data-quote="Gamesniper19" data-source="post: 1538697" data-attributes="member: 95013">NZ - you and I could talk for a long time and learn from each other. Your post reminded me of something I saw on the 7mm-300 Norma improved I built last year. We did see the carbon rings you mentioned and this overbore cartridge is INCREDIBLY finicky and any issues can cause pressure and accuracy issues. Cleaning to bare metal is vital.In this particular case, cleaning with an abrasive may be appropriate for that particular spot, and I did agree with that in my statement, although I would still say and I hope you agree, very few people should ever use abrasives if they don&#039;t know how. They should not be used as a regular cleaning routine. I agree, an initial chamber polishing with abrasives can help increase accuracy, as long as the abrasive polishing does not take the chamber out of tolerances. Again, this takes someone knowing exactly what they are doing. This should NOT be done again after the rifle is broken in unless there is an issue.&nbsp; This is the same for a good barrel, in fact some barrels are made a 10th tight so that a good hand lapping can make the diameter exactly what the barrel maker wants in spec. Some are left a 10th tight at the muzzle for all copper bullets to ensure contact in the last 3 inches. Yes, abrasives are used. Again, no average shooter should ever use abrasives on their barrel as an everyday process to clean to bare metal unless they know EXACTLY what they are doing. If they don&#039;t that is a sure way to ruin a barrel at worst, and lessen barrel life at the least. I agree with you, that for LR hunters and normal shooters, under normal every day conditions, they will never come to this need and that is why I recommend they ONLY cleaning with solvent to the bare metal. I would not recommend abrasive cleaning to someone who doesn&#039;t know what they are doing. Solvent and a good brush is enough for 99% of all shooters. What I do like about this sport and this community, is that success can be seen with various processes. A 1/4 minute gun is a 1/4 minute gun and if we are talking microscopic data, like barrel life variances of 10% or pressure variances of 1000 CUP, then it is less of a barrel cleaning process and more of a heat and number of rounds issue. Hope you have a great mountain adventure and come home safe.</blockquote>

[QUOTE="Gamesniper19, post: 1538697, member: 95013"] NZ - you and I could talk for a long time and learn from each other. Your post reminded me of something I saw on the 7mm-300 Norma improved I built last year. We did see the carbon rings you mentioned and this overbore cartridge is INCREDIBLY finicky and any issues can cause pressure and accuracy issues. Cleaning to bare metal is vital. In this particular case, cleaning with an abrasive may be appropriate for that particular spot, and I did agree with that in my statement, although I would still say and I hope you agree, very few people should ever use abrasives if they don't know how. They should not be used as a regular cleaning routine. I agree, an initial chamber polishing with abrasives can help increase accuracy, as long as the abrasive polishing does not take the chamber out of tolerances. Again, this takes someone knowing exactly what they are doing. This should NOT be done again after the rifle is broken in unless there is an issue. This is the same for a good barrel, in fact some barrels are made a 10th tight so that a good hand lapping can make the diameter exactly what the barrel maker wants in spec. Some are left a 10th tight at the muzzle for all copper bullets to ensure contact in the last 3 inches. Yes, abrasives are used. Again, no average shooter should ever use abrasives on their barrel as an everyday process to clean to bare metal unless they know EXACTLY what they are doing. If they don't that is a sure way to ruin a barrel at worst, and lessen barrel life at the least. I agree with you, that for LR hunters and normal shooters, under normal every day conditions, they will never come to this need and that is why I recommend they ONLY cleaning with solvent to the bare metal. I would not recommend abrasive cleaning to someone who doesn't know what they are doing. Solvent and a good brush is enough for 99% of all shooters. What I do like about this sport and this community, is that success can be seen with various processes. A 1/4 minute gun is a 1/4 minute gun and if we are talking microscopic data, like barrel life variances of 10% or pressure variances of 1000 CUP, then it is less of a barrel cleaning process and more of a heat and number of rounds issue. Hope you have a great mountain adventure and come home safe. [/QUOTE]

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