Soupcan max

[lastborn]

How fast can you push the LEE soupcan {113} boolit accurately in a Marlin 336 30/30 please? Anything above about 7 or 8 gr, Unique and mine is all over the place. Can you you get better accuracy with a case full of a slow burning powder?
thanks

[quilbilly]

I use that Lee "soupcan" in my 32-20 and accuracy fell off after 1600 fps.