I had a box of 180 grain Rainier bullets .40S&W recently and I was seeing some variation in my groups. So I started grabbing a handfull of bullets out of the box and weighing them on an electronic scale. On 180 grain I found up to 2 grains + or - with only 10% or less right on 180grain.
I had the same problem with Rainier bullets in 9mm 124 gr and .45 ACP 230gr - with + - 2 grains as kind of the "norm". I've switched over to Montana Gold in all calibers and for the most part the bullets I've checked are = - 0.2grains which is a lot better.
What are you seeing in terms of bullet quality / what kind of bullets are you using for your reloads ?
I had the same problem with Rainier bullets in 9mm 124 gr and .45 ACP 230gr - with + - 2 grains as kind of the "norm". I've switched over to Montana Gold in all calibers and for the most part the bullets I've checked are = - 0.2grains which is a lot better.
What are you seeing in terms of bullet quality / what kind of bullets are you using for your reloads ?