I have a couple of older boxes of the Speer Hot-Cor 120 grainers. Anybody had any experience with these? I believe they are flat bases. I haven't used any of them in my 257AI due to mag box length but just acquired a 25-06 take off barrel I'm about to screw on a 721 I had picked up for the action.
This is my pet load with the Speer 120gr Hot-Cor. Shoots just as good with RL25, not quite as accurate but still very good accuracy with a little more velocity. Really snatches the ground out from under a deer and kills like a lightning strike!
Excellent accuracy. For clarification, was that with Hot-Cors as stated in your text, or spitzers as noted on the target? Hopefully, it was spitzers. Sadly, 120 Hot-Cors in 257 are no longer available.