Thanks for the heads-up Peter, I've joined in the barrage of e-mail enquiries which Brian D. will surely be getting about now. No pack drill involved I hope.

Most of the 7.62 No4's which I've bought have come with converted 303 extractors, which seem OK for extracting for single shot full-bore shooting, not so good for ejecting with the 7.62 magazine. I got so annoyed with grinding repro 7.62 extractors to fit, that I ground up a 303 one instead, reasoning that at least its metallurgy might be better. I measured the position of the claw in relation to the bolt-face, and the angle of the front face on a good 7.62 extractor, and ground the 303 one to match as close as I could.

I see what you mean though about the narrower claw not coming into contact with the 7.62 rim as quickly as the bolt is opened; it has not so far been a problem for me, probably since I full length resize my 7.62's for reloading.