Hi folks. Recently got my Farmingdale Sharps, now in 45-90, back from barrel maker and had a chance to shoot it yesterday. Load was 83gr Olyde Ennisford 1 1/2 with a .06LDPE wad, 540gr Postell boolit, Win LRP and newspaper wad between flash hole and powder column. Every round fired had primer brass flow into the firing pin hole in the breech block. The primer brass then got smeared out as I dropped the block to extract the round.
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To check headspace, I put feeler gages between the block face and barrel, both with and without a brass chambered and with and without the lever captured with the povot pin. In all cases the largest feeler was .004 inch, and according to what I could find on the internet, up to 0.007 inch should be acceptable for this gap. The base of a seated brass appears perfectly flush with the end of the chamber
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If it isn't headspace, then the only other thing I can think of is the shock wave from the primer partially bouncing off the powder column and forcing the primer into the firing pin hole. I did a double compression on the powder, drop tubing 56 grains and compressing, then drop tubing 27 grains and compressing that. The column gets fairly solid that way. Any thoughts?