I made a new post because I didn't want to take from King's.
I thought I would ask this because a lot can change if one does not know bore size of gun, am I correct? Also we take for granted what the bores are supposed to be and then have someone put a Skeet's or Brownell's dial indicator in and say we have a .015 and .025 readings, compared to what?
In my opinion unless you know bore size how can you know choke size. Example early 16 ga L.C. Smiths, bore was .650 and changed I believe in 1936 to .662 so there is .012 difference in size of bore.
Also an early 1899 L.C. Grade 2 12 ga. the bores start out at .724 and in the right barrel go in 13 5/8", left barrel 17". Bore gage of .722 goes in right barrel 26 9/16" to start of choke taper. Left barrel goes in 27 3/8" to choke taper. Barrels are 30" long. Muzzle end choke area mikes up right barrel. 686 and left barrel .683. Skeet's gage going in 11" from muzzle, zeroing indicator and withdrawing gets .015 in right and .017 in left. Which would mean to me, light modified. Bore readings and choke readings make this .037 & .040 difference.
To me anyway, too many people put too much emphasis on what kind of chokes their guns have. The only things that have changed in 100 years are the ammunition that it fires. The only real way to tell is shoot the gun with the shells you use most often and see how it patterns at different yards. All will be different.
The only good thing about getting bore readings and choke readings is to see if your gun's barrels were honed or bored out.
