I managed to reduce this somewhat with a 7X57R by somewhat reducing the loads using a faster-burning powder. On this gun rifle barrel is soldered full-length to shotgun barrel. Normal load with 175 grain bullet and full load of IMR4350 gave very good groups at 100-200 meters, so long as 5,0 or so minutes between shots. Two really fast shots were OK too, just hold a little lower for second. Almost same results with Norma 150 grain factory ammo. Certainly no problem with big targets in forest, like moose or kronhjört in opening.
However, load with enough IMR4895 and 145 grain bullet to give good velocity (never chronoed) gave less spread between 1st and 2nd shots, enough that with open sights there was no effective change of POI for two, sometimes three shots. Basic reason seems to be that lighter load heated slim rifle barrel less. Still plenty of power for deer at 100-150 meters.
Niklas
