So here's the deal. I loaded up some 60 grain Sierra HP's (#1375) the other day with 33 grains of IMR 4064 and got really good results, shooting a 6 shot group of a little over a half inch out of my Ruger M77 with a sporter barrel and a 14 twist. So I decided to try the 60 grain Nosler Partitions with the same load with the exception of the case. I changed from Norma to Hornady but retained the same case length and the same cartridge OAL which put the bullets at 10 thousandths off the lands. The Nosler's shot terrible, 5 shots in a shotgun pattern of about 3 or so inches. The length of the bullets were close, with the Noslers actually being 2 thousandths shorter then the Sierra's. I was really hoping the Partitions would shoot better. Any ideas as to why such a discrepancy in performance? Could it be the weight distribution of the Partition as compared to the Sierra HP? There was no keyholing with the Partitions, just a wide group.
Last edited by jaytee; 04/11/22.
