I have been testing a Sprinfield side by side that I fitted with Tru Choke Standard Choke tubes and have found, at least with this gun that switching choke tubes alters the Point of Impact between barrels. The Springfields at 25 yards cloverleafs slugs at the seven o'clock position. I have been reading about the ecentric choke tubes and wonder if this might be a viable option for regulation. The Springfield in question actually shoots better with modified tubes however one is Colonial Arms manufacture and the other is an unknow that I can't make out the inscription on. Thanks for any info or advice.
Mark
