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I'm also in unique situation of having an overboard 410. Same diameter from chamber to muzzle...gives options not available to normal .410 users

I can easily get solids for .410. But they are sucky...87 grns soft lead at 1500 fps...many folks used them and curse them.buckshot better option. It's no biggie,just seeing if there was a single...

so is that 3 balls in a 3" ??? so try 2 balls in 2 1/2" with same charge weight of powder for slight increase in velocity LOL.
Ive heard of folks using a .357 projectile in the wee .410 too...

no because its opposite to above....heavy and uber expensive LOL

cause generally .410 single shot guns are lighter than a light thing to carry,and not uber expensive to get.

the mad scientist has returned from the lab
Egor my trusty assistant is now on half pay as ran out screaming halfway through proceedings.
learnings from the experiments
#1 jamming hand between die...

SO HOW my crazy mind went in this direction.....
the 277fury gets higher pressures SAFELY by a better case/stronger case design.... surely a brass case is stronger than plastic jobbie
the .410...

yes....my thoughts have often wandered in this direction..... still searching for perfect answer LOL.

the "white gold" doesnt pick itself up mate

The 410 shotgun was created using left over 303 British cases,straight walked to poke in cordite then sized down for 303. The 410 is just a 303 brit with straight walls..with me so far??? So what...