Larry:
Your post caused me to read what I had written. The reference to old cars and gasoline was and is plain stupid. LOL
I agree that choke work is OK after patterning the gun, but still think that lengthening the chambers and cones is a bad idea.
Sherman Bell proved that the one is unnecessary and I have never seen any proof that the other is effective on real recoil. Perceived perhaps,but not real.
Then again, I am a purist and may not be able to see the woods for the trees.LOL
Best,
John

Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.