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Post by rangeball on Oct 1, 2015 13:22:22 GMT -5
Brothers h&r 45/70 BC converted to sml has a rough part of about 4-5" in the middle of the bore. We've known it was there but when shoving some pure lead cast Lee real bullets through today it became clear how rough it is. The soft lead looked like it had been through a cheese grater.
I know many recommend JB bore scrubber but we don't have any. He does have some Noxon 7 metal polish that I've read about guys using on guns but not specifically bores. Would this be ok to use?
The buffalo bullet guy recommends #0000 steel wool and gun oil and about 15-20 min of lapping to remove tool marks and chattering. We may try that as well.
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Post by Richard on Oct 1, 2015 14:19:11 GMT -5
You might want to get some lapping compound........something above 500 grit on a tight patch. I know one long range shooter who, over the winter gave his 300 Ackley barrel a severe scrubbing with #400 Clover brand silicone carbide lapping compound and at the first spring match, he shot a 10 shot 4" 1,000 yard group. Not saying it will work miracles on everyone's barrel but that is the route I would go...........then clean it out very well. A lead lap is what a barrel maker would use but this process gets a little more complicated.
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Post by rangeball on Oct 1, 2015 15:25:30 GMT -5
We looked at that fire lapping kit from one of the cast bullet makers but its $50. Want to try something we already have first and work our way up to lapping as a last resort.
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Post by edge on Oct 2, 2015 8:21:03 GMT -5
Most of the polishes don't do much at all and it mainly depends on what you use as the lap.
One thing to remember is that lead will adjust to the the smallest bore size and most other media will not.
That means that a lead lap in theory only cuts the tight spots where as something flexible will cut everything since it will constantly adjust to bore variation.
edge.
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Post by cuda on Oct 2, 2015 11:58:41 GMT -5
I would get so 400 or 600 lapping compound and use it to fire lap the barrel. It might take more rounds to get where you want it but it will be a fine smooth finish in the bore when done.
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Post by dannoboone on Oct 2, 2015 12:12:14 GMT -5
The buffalo bullet guy recommends #0000 steel wool and gun oil and about 15-20 min of lapping to remove tool marks and chattering. We may try that as well. ^THIS.^, lapping mainly on the rough area. If that doesn't get you satisfaction, use the Noxon 7 impregnated into the steel wool along with the oil. I used Flitz, but it is very similar. |
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