I have a Remington built 1903. I think it was built in 1943 but I will double check. It has been sporterized. I'm fairly sure that it is the original barrel that has been cutdown to 21" and a new front sight added. It has a receiver mounted Lyman peep sight on it.
I slugged the bore and it measures .301-.302" X .310". I have a muzzle gauge and it measures a 2. I read somewhre that during the war some of the specs were relaxed to meet production goals so that would explain the .310" groove diameter. It has a long throat and a considerable jump to the lands.
For several years I have been content with shooting a NOE 314299 sized to .312". It shoots this bullet very well, 2"-3", with just about any powder or load. But lately I have been wanting to shoot jacketed.
This rifle shoots 147 gr FMJ's or 150 gr SP commercial bullets very well as long as the velocity is under 1500 fps. If I try to duplicate factory loads similar to my ones for my deer rifle, 2500-2700 fps, the groups open up and sometimes don't even make it on paper.
I had consider having it bored out to a 35 Whelen but for now I want to stick to 30-06. Am I looking at a new barrel? New Criterion barrels are available I think. Is there something I am missing? Should I just be content with shooting cast? Which I love by the way.
Thanks for your time,
Steve in N CA