On Fri, 17 Mar 2006 10:06:39 -0500, SteveF wrote:

Don't know if this is any help but Hatcher's Notebook shows a M1 Garand bolt
of 8620 treated to Rockwell C 55 to 59 and the M1 Carbine bolt of 4140
treated to Rockwell C 48-54.

Ah. Of the two, the carbine's is probably more relevant - I'm not
locking any lugs into anywhere, And, I have 4140, so it's a good
starting point. Thank you.

I thought I remembered Thompson info in the
book also but was incorrect.

Yes, I thought he wrote something about it also. I've got I think all
of his books, so it may take some digging.

Dave