I've been following the 75000 Wadcutters thread since the beginning. Always meant to follow up with a similar, though less ambitious program. Now I'm finally trying to get started although at my age I doubt that I will put up those kind of numbers.
My questions center around the results I got from slugging the barrel of my S&W Model 28, Highway Patrolman. The first thing I did was to us my plug gauges to measure the cylinder throats.
All 6 throats accept the .357 gauge. One is just a tad tighter but with a little adjustment to the entry angle, it would go in and go full chamber.
I then slugged the bore. There was more resistance where the barrel threaded into the frame. The slug measured .3529. I was able to calculate that measurement using a Vee block I obtained from a member here. The calculated groove diameter is .3529".
To double check this, I used the .357 plug gauge in the Vee block and calculated a diameter of .3574(for the gauge only). I figure that is close enough.
At this point, I don't think I need to do anything. If anything is required, I could fire lap the barrel to remove what seems to be thread crush where the barrel threads into the frame.
I guess I would like to hear what members with more experience in this area think my next move should be.