I hate porting, and have two ported guns that I never shoot anymore because of the porting. Having said that, I have a Browning Feather XS Sporting in .410 with 30" barrels and no porting. It is probably my favorite .410 and it is a very nice gun. Miroku builds good stuff for Browning, and you may be able to find a Miroku-branded gun with no porting, something like an Mk70.