Okay, finally got a minute.
Last range trip I shot a bunch more store bought cast bullets that I've been using to work up a hunting load for this year. While groups were minute of deer at 50 yards, none really got my motor running. My own cast, lubed and sized bullets did even worse...
Anyway, after they were all shot and I only had the 4 jacket bullets (240 gr. Hornady XTP Mags) I had loaded left, I wasn't expecting much from them group wise. Especially since I had just arbitrarily picked a powder charge
Now I've not shot anything but cast bullets in this rifle. I haven't cleaned it in at least 75-100 rounds and haven't even checked for signs of leading. But when I fired the 4 bullets they clustered inside a 2 inch group, exactly at point of aim!
I know this doesn't sound that great, especially at 50 yards, but believe me it is, given my old eyes, a receiver sight and me wearing 1X reading glasses so I can see the froint sight!
It grouped as well as my M94 30/30 that I've also been working with! So:
I've loaded some more with gradually increasing charges of 2400 and will accept the charge of the best group I shoot for this years hunting!
I'll play with it some more if time permits, but I'm up to 7 rifles, 1 pistol and 2 BP rifles that I've got to get ready for deer season and less then 2 months to do it!
Oh, and I'm not going to worry anymore about shooting jacketed bullets after cast!