Paul,
A difference of .005" should not matter much to the wad sealing or pressure developed. A difference of a .022" larger bore as Harry mentioned would likely have a negative affect on a fiber wad sealing.
The above stated, I use Gauge Mate adapters to shoot 12 gauge in 10 gauge guns. the plastic wads which I use, normally Claybuster brand, seem to seal good enough. I am using smokeless powder which because of a longer buring time may allow the under-sized wad time to seal in the larger bore. One of you black powder guys please correct me if I'm wrong on this.
Mark
For what its worth...
Mark
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