2 3/4 dram
I guess we need to the disclaimer thing i.e. have a competent gunsmith check your gun...
As to a Trojan or VH with 2 3/4 drams, that is far below its proof value for a 12ga. And, I have shot a few thousand rounds of 2 3/4 out of my VH. Not an issue. Both Vulcans and VH use modern fluid steel barrels.
As to spreader loads, they have a mixed reputation. I know people who use them, but I also know people who have pattern tested them and found really big holes in patterns.
an ounce with 2 3/4 dr eq of No. 8 should do just fine. Mine is Mod/Full and has not been a problem for Clays.
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