i agree stubble. But if you read my post, it didn't seem to matter too much what I stuffed the cases with. I used 3 different powders, 4 different bullets (manf. and weights) and 2 different primers. Even then the largest group was just over 1". And these are 5 shot groups, not 3 and with a light weight barreled sporter. With this kind of accuracy and pushing a 200 gr bullet in excess of 2900 fps I am not complaining but I'm not putting down any other cartridges either. I too have other rifles that when I found a load they liked are extremely accurate if I do my part. I am just stating that imo there may be some truth to the accuracy of the WSM family of cartridges - or maybe I just got lucky.