Bore Gauge questions

[J. Scott Hanes]

Congrats on the new toy! I have a Stan Baker all-gauge set and love it. As far as "nominal" goes, it is just that. I don't think a couple thousandths either side will make any difference and would be in tolerance levels.

In my experience measuring the choke area, I do try to get right to the edge of the muzzle, but make note of where the most constriction exists. I have seen some chokes (not Parker) that had a "huge" difference in the last <1" and some that have a long parallel segment, then a gradual taper and a few that actually close then open up at the end. So, I guess you can find any type choking but as far as Parker chokes, I can't say one way or the other what a 'standard' Parker choke looks like.

It is fun to see how consistent those "good barrels" are.

[Dean Romig]

Originally Posted by J. Scott Hanes

Congrats on the new toy! I have a Stan Baker all-gauge set and love it. As far as "nominal" goes, it is just that. I don't think a couple thousandths either side will make any difference and would be in tolerance levels.

In my experience measuring the choke area, I do try to get right to the edge of the muzzle, but make note of where the most constriction exists. I have seen some chokes (not Parker) that had a "huge" difference in the last <1" and some that have a long parallel segment, then a gradual taper and a few that actually close then open up at the end. So, I guess you can find any type choking but as far as Parker chokes, I can't say one way or the other what a 'standard' Parker choke looks like.

It is fun to see how consistent those "good barrels" are.

Austin Hogan plotted the bore and choke tapers on many Parkers and I have several of his graphs. I will post them here on the forum whan I can.
He told us that the Parker Bros. chokes began with an ogee from the bore into the taper and ended with an ogee from the taper to the parallel terminal 1/8” - 1/4” at the muzzle.





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