I still use the Rem 6 1/2 primers in the hornet. In the older rifles I use .223 bullets in the newer I use .224 in 40 gr. Shoot well..especially in the Ruger 77-22H. I do have the bolt shimmed for decent Head Space. The 43 is hard to get to shoot well because of the way the bolt locksAlso remember that the Hornet was a great success when it came out as there was nothing to compare it to..other than the 25-20 and 32-20 as varminters. Another thing that will help is weighing cases and matching them up. Hornet cases were always kinda all over the map on weight and variation. Things are better these days. I consider an inch as good accuracy for the hornet...consistently. That Ruger shoots better quite often but it is still a Hornet. The K version does seem to shoot better than the original