Good Question ,, Good replies.. Thanks..

I've always loaded .38 +P loads in .357 cases for NRA action pistol and general use / target practice.
But, I recently purchased a 627 and was planning on trying 38 short colts for speed matches.

I've never notice a accuracy problem shooting 40's in my S&W 610. But I don't remember shooting anything with it smaller than 'Minute of Steel Plate '.