OK, starting to under stand

Have you tried a hard heavy seat of the bullet, and then, try a softer, or less seating pressure.

I have a 50 with a 1-30 twist that shoots Maxi's quite good with a charge of 115FF.........the groups really tightened when I started using a wad and opened the front diameter up to thegrove diameter. [on the maxi mold]

You also need to maintain a constant fowling in the bore.....very important! Many different ways, justneed to find one that works for you.