Tom,
I load for 12 and 10 bore paradox. I generally don't shoot past 100yards. I start checking accuracy at 50yds and if those loads look good at that range, I "proove" the load at 100. 2" at 50, 4" at 100 but better acurracy is possible. I have not shot round ball out of the rifled chock guns. Getting the right bullet, componets and velocity is key in getting these guns to shoot well. Long range paradox shooting requires the LT type capped bullet and I have not been able to duplicate that as of this time. I hope to procure a big bore round ball gun in the near future.