Bolt head for Lithgow #1 rifle
I need a bolt head to replace that currently installed in my rifle - the headspace currently measures .076", which is longer than the 'NO GO' specification. In order to bring the headspace within the specified range (and as close as possible to the minimum), I need a bolt head which measures ca. .641" from the rear surface which contacts the bolt body to the face of the bolt head - any bolt head which measures within plus-or-minus .003" of that length would be acceptable.
Does anyone have a spare that falls within that range, or can anyone point me to a likely source for one?
I am aware that over-long headspace is not necessarily a safety issue, and that it can be compensated-for in fireforming the brass, but still want to bring the rifle's headspace within the specified range, to avoid potential problems.
Thanks;
mhb - Mike
And, while you're there...
Quote:
Originally Posted by
Parashooter
The following, quoted from one of mhb's posts on another forum, may help us understand the difficulty he is having adapting to the unfamiliar SMLE -
"Some of the information in CPT Laidler's excerpt is a bit confusing: 'CHS', though obviously related to headspace, is not explained, though 'GO' and 'NO-GO' limits are clear enough; the '.050" limit' referenced is unexplained, and not self-explanatory. The permissible degree of over-rotation of the bolt head is interesting, but only useful it there are a number of candidate bolt heads to work with. . .
I was unaware of the need for the rear of the bolt head shank to contact the firing pin collar before the head is fully turned-in to the bolt body: is this critical in some way? If so, it would seem that it could be achieved (if not currently present in the assembled bolt) by increasing the firing pin protrusion until contact is achieved, and then shortening the protruding tip of the pin as necessary."
(View in context at
Lithgow stock finish... - Page 3 )
Please read the rest of the thread, so that you may have the full context of the discussion. The excerpt was just that: I had not seen the full text, and what was included was not fully explained, nor all directly related to the headspace issue, per-se; therefore, my additional questions.
mhb - MIke