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For that heavy of a slug that is quite a heavy charge. Considering Winchester 296 is right around the same burn rate as H110 - I would think that 12g would be pushing the envelope. By the looks of the barrel ... that would be correct. With bullets under 200g I don't mind using the common Whisper powders in excess of 10g, but once your slugs are 200g+ you best stay under 10g of powder until you know what your playing with. I had a cartridge start to come apart on me with a load that I was working up using No. 7 ... looks very similar to the backend of that one in the barrel. This was early in my load developement days and was my wake up call .... I am lucky I got away with as little collateral damage as it caused. With such a heavy bullet and swimming in uncharted waters - you best keep it conservative or you'll end up missing body parts.
Sarg
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