Barnes 112gr. Matchburners in 6 ARC

[Lemonaid]

I would first observe how much of the powder column is taken up by the 112 MB (quite a bit.).
But here is some data that should be relevant all though it's 6PPC 1-7 barrel.
Oh, unless it's the only primers you have, skip using cci 400's.

6PPC RAP 24 inch barrel.

Barnes 112 MB, Lever 27.0, Horn/Gren 6x, cci 400

2.290 2627,2668,2649 3=1.980 SD 20.5 AVE 2648
2.280 2659,2665,2669 3=.480 SD 5.03 AVE 2664
2.275 2674,2686,2668 3=1.360 SD 9.16 AVE 2676
2.270 2673,2680,2685 3=2.145 SD 6.02 AVE 2679