Welcome aboard, Ken!! Congrats on the new 25-06!
You've just found out why it's important to try different factory ammo, they're as different as handloads, one may shoot terrible, while another nice tight groups, ya just never know until you try.
Mine shoots the Hornady 117gr BTHP and Federal 115gr Nosler partitons equally well.
H&R only offers extractors on centerfire barrels now, and there's no easy, practical way to convert an extractor to an ejector.
Tim