How to determine barrel chokes?

[Dean Romig]

True Bruce, most American gun manufacturers that supplied Damascus or Twist barreled guns after the introduction of smokeless powder on the commercial level proofed these guns with smokeless powder. Sometime later Ammo manufacturers, gun makers and the "hook and bullet" press chose to tell the general public that these Damascus and Twist barrels could not be trusted to withstand the pressures of smokeless powders, hence the big scare to either junk the guns or have them rebarreled.