I'd get a rifled choke tube, and use a .625 dia ball with NO wad petals, just hard cards underneath and a "gas" donut.

The little bit of spin the rifled choke offers will stabilize the RB just nicely.

I'd use WW alloy.

I shoot .625 dia RB in my rifled NEF slug gun and they shoot very nicely. I do prefer a full bore slug like this one.

[Linked Image]

Whatever you are willing to put up with, is exactly what you will have.

When your ship comes in. ... make sure you are willing to unload it.

PAYPAL, sucks and I will never use them again. I recommend you do the same.