"the point is, your point of impact will be different with a clean barrel, versus a dirty barrel. Most often times, a drastic change in the point of impact."
Absolutely. The point is, my confidence in my gun and it's accuracy is highest using the method I am using. That is really all that matters to me. Years and years ago I tried clean bore shooting and the results were unrepeatable points of impact. I will never go into the woods with either of my muzzleloaders (or rifle) with a clean unfouled barrel. When someone tells me they are not getting good repeatability (e.g. not tight enought groups), the first thing I will recommend it fouling the barrel and then shooting for groups. Then I'd advise changing the powder load, powder type and bullet type/weight configurations until the desired results are acheived. And based on my experience, I would never advise someone to sight their gun in based on the impact of their bullet from a clean barrel. I have never seen a muzzleloader or high power rifle that will shoot the same point of impact with a clean barrel and fouled barrel. You can say what you want, but if dead deer could speak, over 150 of them would tell you I'm not wrong. I'm not bragging, I just don't miss.
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The Second Amendment should have been the First Amendment, because without the Second Amendment, there would be no other rights.