what is the length of your chambers?
and which slugs - Foster style slugs are designed to be shot out of full chokes - one of the reasons they are less accurate than the true to bore slugs meant for slug barrels
i would be concerned about the pressures created by a slug load due to wad columns and the rigid weight of the load - but that is a guess
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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