Lots of variance in chambers of nonfactory cartridges back in the day depending on who did the work & who made the reamer.
What you need is to have a set of custom dies made for your chamber there are several people who will do this if you Google it. They usually will require you to send several cases that have been fired in your chamber for them to work with. Since you seem reasonably certain that you are working w/a .219 Donaldson if you can borrow a std .219 Donaldson FL die & buy a sacrificial shell holder. You can shorten the shell holder .001" at a time with a lathe or even a file until the case will enter the die far enough to size the case so it enters the chamber (you can also shorten the die & accomplish the same but at more expense)
Once you have 3 cases that will enter your chamber you can load them with a moderate charge & fire them to get your fireformed cases to
make your custom die set from.
You will be shortening the shell holder on the face or top & adjusting the die down about 1/4 turn after touches the shell holder with the ram on the press fully raised. Be sure to go slowly w/the process of shortening the shell holder as you want the case sized just enough for the case to chamber w/o creating any excess headspace & risking a case separation when you fire a loaded cartridge.
Unless your chamber is cut really far off from standard dimensions this will work & if it doesn't all you are out is the cost of the modified shellholder.
The above procedure is of no help if the rim depth is not cut deep enough but you have indicated that this is not the issue.
It's not all that difficult to do & worth the effort to get what sounds like a nice rifle shooting.
Last edited by Brittany Man; 01/29/19 05:18 PM.
