DM, for fireforming, like you're referring to.....do you just shoot .30-06 ammo in your .35 Whelen?
NO, do not do this....
I prime the case and then use a small amount of pistol poiwder... On top of that i pour cream of wheat and tamp it down, filling again... I then fire them outside loading and holding the bbl in the "up" position...
Ajust the powder amount half grainat a time untill you just get nice necks... Bullseye works pretty good...
I've fireformed thousands upon thousands of shells and it's always worked best for me....
DM