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Vash,
I’ll bet your rifle is a Japanese vice German made rifle. I’ve helped on five different .25 caliber (3, 25-06 and 2, 257 WBY) rifles that copper fouled so bad that they we start spraying rounds during the second box and literally keyhole between the 2nd and 3rd. I suspect they have the same source for their barrels.
Getting all of the fouling out is a real *****. I abhor any ammonia base solvents, it has been documented that they start to etch steel in any use.
Use Outers Foul Out to remove the metallic fouling. This is a reverse electro plating process. Then use JB bore paste and either regular Hoppes or their black powder specific to remove the powder fouling. You’ll probably need 2-3 iterations.
Then Pressure lap using the NECO system vice any of the others, there is a large quality delta. The difference with really rough bores is using more of the 220 grit, these were the roughest rifles bores I have ever worked with and required 20 rounds at 5 rounds between cleanings. I usually use more rounds in the fines stages; at least 10 at 400, and 20 at 800 and 1200 grit stages.
All this takes time but it is concentrated vice spread over periods and a net time saver with the added benefit of far better performance.
Finally, I strongly suggest using moly coated bullets to reduce fouling. It is worth the effort.
S/F, FOG
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