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Is there any accuracy difference between large rifle vs. small rifle primers. I am slowly running out of Federal G210M primers that I use for my 308Win custom rifle. I just purchased 2 bricks of Federal G205M primers, so I was wondering if I should expect any change in accuracy. My rifle has heavy Krieger 20" varmint barrel and with Federal G210M it shoots sub-1/2 MOA groups all the time (half groups are 1/4 MOA groups). Will Federal G205M offer the same accuracy? Of course, I have to start using brass with small rifle primer pockets and re-do load development.