Thor recently came out with a one size fits all that has slits up the side at the base. This allows the cupped base to flex more in a tighter barrel. I recently purchased some but haven't had a chance to try them out. The FPB on the other hand either fits or it doesn't.Lee 9 said:On my TC I have to use enough corn meal to get the conical clear of the QLA before the pressure disturbs it.
If that don't work then the FPB 350 grain probably will as a last resort the expensive Thor might getting them properly fitted can be a problem.
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