I think I'm ready now. As I told grandpa Mac it slugs .375 but that was driven through from the muzzle end so I dropped one in the breech it goes several inches before it stops so either it's got a very long leed like a martini or its a bit worn. So I thought either a good fast kick in the bum to get them seated or paper patching might be the best options.
Paper patched a few, it's fiddly but seemed to sort it out but was a bit hit and miss. I also loaded 6 with 15 grains of blue dot for a good swift kick.
This is what happened with them at 50 yards shot off a rest.
Aim point was the red dot, all landed in the green, the one in the red is after a sight adjustment. Pretty happy as you can guess and they sound "proper" too.
Thank you gents for the ideas, a team effort .
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