Kurt,
The best way to get your barrels contoured as lightly as possible is to go to various barrel makers websites and check out what their lightest contour is in that caliber. After you locate the lightest contour either buy two of those or send an email to that maker and ask if he can make them ligher up front, that's where you need to make them as light as possible. Don't forget to check and see what type of steel they are using, some is better than others for thinning out of the barrels. The .22 Hornet caliber has been used in drillings for years and they make their barrels very small in diameter. Of course it is fixed to two large shotgun barrels which makes it a good deal stiffer. Bob