I am a reloading newbie wishing to load 7x57 for a Ruger No.1 with a short Stutzen 19" barrel, initial loads were 140g Nosler SPBTs with Hodgdon H 4895 with 39g/38.7/38.5g the latter tightened up the groups to 11/2" from 4"......my question is regarding the barrel length, do short barrels do better on lighter loadings? The twist rate is 1 : 8.75". Right handed... Many Thanks, Anton