Milsurps forum might be able to help. I'm curious as well because I'm doing the same thing as you.
That's a pretty rifle, is that the numrich repro? I've heard it can be a pain to zero those scopes how difficult was it to zero? And I'll likely get a mount that mounts using the extractor screw and the rear sight holes.
I was referring to the size of the bolt head. From my understanding the bolt head will be thicker (by just a few thou overall) to help account for throat erosion so the rim of the case will sit against the bolt head and head space properly
Okay, I thought .303 Brits headspaced off the rim. Then I did some research and found I was all wrong...two left feet.
I had to say that owning one and reloading for it, sure made me think it was headspaced more like a rimless, which is off the shoulder. So, then I reloaded for other rimmed cases and belted cases and understood that the case should have been headspaced off the rim. But, it sure didn't seem that the rifle was made (counter-bore cut for the rim) to do it that way. I did read later on that you should not full length resize these as that will cause case head separation. Which I had a couple of. I attributed that to the bolt head. When I checked though, that matched the rifle. So, I was a little stumped.
Come to think of it, that's what I did use, Hornady 174's. I was able to get some British surplus and those are the 174's I could never get to reload with. And, now that I remember a little better, I didn't sell it until I got to Idaho. Still, for what I got it for, it was a cheap fun gun to shoot.
