tobnpr reminded me of something you should check...
Check your muzzle, to see if the barrel has been counterbored. (Reamed to a larger internal diameter, due to erosion/corrosion.)
If it has been counterbored, your options may be limited. In other words - that barrel may be a dead-end, without chopping a few inches off.
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Don't even try it. It's even worse than the internet would lead you to believe.
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