The problem with those conversions are while the breech is big enough to be bored out for the 8 ga cartridges, the barrels dont have the wall thickness to bored to true .835". So you have to get a bit creative they are bored to around .815" give or take. Even then they still seem to have problems with bulging. I think youd want a 10 gauge with a minimal wall thickness of .100" so when you bore it out to 8 ga youd have the .040 MWT which is what i see on alot of 8 and 10 ga doubles.
Seems like you could use one of those magnum 10 gauges and have a set of 8 ga barrels made for it of course that would set you back about 10k. I knew a gunsmith who used to bore out the H&R single shot 10 gauges to 8 ga, he proofed tested them to 21k psi. He stopped doing it though because who wants to spend $600 on reboring a barrel on what was then a $200 gun.
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