I have 2 large case rifles, a 1876 Martini and 1873 Beaumont. I have been shooting the MH with a 485 Gn cast, with 47 gns of 3031, packing the case with kapock, and a disc to keep all the powder down by the primer pocket. So far so good. When I purchased the Beaumont a couple of weeks ago the shop owner/gun smith advised me against using the packing as he said it would create a shock wave of some type that had the potential to bulge the barrel. He further advised that he had run across a number of rifles where this happened. He recomended that I switch to 5744 as a slow burning alternative and forget the stuffing. How is this problem approached by others on this forum. I am hesitant on filling such a large case with so little powder and sort of having it lay about all over the case, not necessarily by the primer.
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