To quantify this i don't shoot shitloads haven't worn out a hundred barrels etc
But I have had a few rifles/barrels that have copper fouled to varying extents.
I mostly shoot groups developing a load then just use it for hunting with the occasional zero check and gong bash thrown in(not much shooting for the fun of it)
My rifles always get a wet patch of hoppes or clp down the bore if they have been out fired or not s/s or blued,while not a full "clean" both products have a very mild copper removing action and wipe out loose carbon.
Dry patch before going out.
case one, shot very very well, would always streak the lands first shot (even with different projectiles)visible at the muzzle with the sun behind your shoulder looking into the first inch of muzzle.
It took 150-200 rounds before accuracy noticeably decreased and needed a full clean out.
case two, heavier copper fouler,would foul the bore as well as the lands,shot pretty well with bullets it liked but it didn't like many that I did. From dead clean it would shoot 25-30 rounds before it went pear shaped and point of impact would change the whole way threw the process.
I tryed JBs bore paste which seemed to make it worse for a start then settled back to the same as before.
I did find that if after a full clean I fired 10 or so blanks(full case trail boss with patch on top) to layer the bore with carbon, copper fouling was substantially reduced compared to shooting from clean.
Case 3 Copper foules like all hell! I wouldnt be suprised if all that comes out the end is the lead center
Cant comment on accuracy its got battle sights and my ability with these is probably about the accuracy im getting anyway and its only got 50 or so rounds down the tube so far.
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