ORIGINAL: stubblejumper
Actually, I think you are correct. Problem with 4350 or H4831sc in the 308 case is not pressure but capacity. You will always be compressed. I have to admit, I have never tried a mag primer with these slow burners. I might have too. Good call.
The problem is that using magnum primers in the smaller cases,often provides less than optimum accuracy.I would simply choose a more suitable powder to gain velocity.
Your right also. The issue is, I have found amazing accuracy with 4350 and 308 case. But lacking about 100-200fps of velocity you would expect. So I for instance love sub 0.5MOA accuracy, I would love to get the velocity Varget or 4064 gives you.