Are any of you shooting a .219 Zipper Improved and, if so, can you tell me what you are using for reloading data?  I finally (after a very long stay at the gunsmith) got my J.W. Van Patten Winchester Hi-Wall in that cartridge back and would like to begin shooting it.  The rifle has a 27-1/2 inch heavy barrel and a 1 in 14 twist rate.

I have P.O. Ackley's data, but given his propensity for supercharging loads, I'm reluctant to rely on it.  I also have seen some references to using .225 Winchester data, but as I'm using blown out original .219 Zipper cases (Rem-UMC), I'm not sure whether that's a good idea.  The original Zipper didn't operate at anywhere near the .225's pressure levels and I don't know if the cases are anywhere near as strong.

So, can any of you suggest a good data source?  Or should I just start with original .219 Zipper data and work up until I'm happy with (or scared by) the results?

Thanks.

I have had good luck forming brass for my 6mm-30/30 Improved using Hornady 25/35 brass.  Not sure what you have for a die so you might have to use a universal neck die and fireform.  Good luck.  Tom