plmeek
40 Cal.
Barrel is 1" straight , 7 lands and grooves, 32 1/2' to the back of the breech plug. Measured 1/2 rotation of the rifling in 31 1/2' travel some where around 62" rifling pitch, allowing for error it could be 60" - 64".
Thanks for the additional info and pictures, Don. I'm as sure as I can be from looking at pictures only that you have a GRRW kit Hawken rifle. It was probably assembled by the person whose name, "G L FORMAN", is stamped on the bottom of the barrel.
All the parts match what I call GRRW's "transition" Hawken rifle that they produced in 1975 plus and minus a few months. The fact that your rifle doesn't have the company and address stamps as well as a serial number stamp tells me it was a kit.
There was a Terry Foreman that worked for GRRW about this time. He is part of a group photo that was included in their 1976 brochure/catalog. G. L. Foreman may have been one of his relatives.
Terry Foreman (in white T-shirt) is second from the left in the second or middle row in the photo below. He is flanked on his right by Pat Lakin (also in white T-shirt) and on his left by Carl Walker. Greg Roberts is in the back row between Foreman and Walker. Phil "Bluejacket" Sanders in kneeling in front of Lakin and appears to the holding an unfinished Northwest trade gun.
The other identifying parts I can make out in the photos are the triggers that appear to be from Ron Long's kit, the nose cap which was a two-piece sheet metal soldered together and made in the GRRW shop, the rear sight also made in the shop, and the barrel loops. The butt plate and trigger guard are the same type that GRRW used, though they were available from a number of sources including Cherry Corners. The lock may have been assembled from Ron Long parts by Rex Weimer who worked in GRRW's machine shop. Weimer is in the second row, second from the right with the full beard.
GRRW started making their own barrels early in 1974. Prior to that they used Douglas barrels which had 8 grooves/lands and 1:66 twist. GRRW barrels have 7 lands/grooves and 1:60 twist. I'm pretty sure yours is a GRRW barrel.
Your rifle is well put together and could pass for a factory rifle except for the lack of barrel markings. Good to hear that you are having fun with it.