I'm hesitant to ask this because the subject is out of my wheel house, but here goes.
I'm trying to understand what could/should be done to the throating depth in my stock barrel to optimized accuracy. This is on a Savage 10 F in .308 and it appears as with most stock barrels when it comes to cast bullets, that it has a short throat. And as I understand it, Production class allows for "lengthening" of the throat. Thus my need to understand where the best seating depth should be in relation to where the bullet base goes to.
The bullet's a 311299 is 200 grain chambered in .308 and the picture shows the location of the bullet in the case in its push back or "jam" position. More tension on the case mouth and another .010 seating depth longer and the bullet would stick in the lands. As its seated now I have nice lands about 2x the width of the land. But as you see the base of the bullet is well inside the case.
I don't have an issue with base below the case neck but I believe that there must be a rule of thumb somewhere in cast bullet accuracy that someone more knowledgeable than I would look at the depth of the bullet base in the case as it's seated and could comment on whether the stock throating supports or does not support accuracy.
I suspect that the bullet is too far inside the case and that the answer is to lengthen the throating. Therefore the COAL could be increased and the bullet base pulled nearer to the base of the case neck.
If I am right, should I have the throat cut to be able to get the COAL longer? And if I have the throat cut longer would I be ok having the gas check come up to just below the neck. Thanks, Bill.