LeonCarr
Member
Hey Folks,
I have been thinking about making the jump from standard dies to either the bushing type sizing dies or benchrest type hand dies for my Remington 700P .308. In preparation of ordering stuff and to make sure I would be ordering the right size bushings, I took some measurements:
The necks of the fired cases coming out of my rifle have an OD of .345. With an estimated .001 of brass springback, this would indicate a chamber neck diameter of .346. After consulting with a buddy that builds precision rifles, a standard SAAMI spec .308 Winchester chamber runs .342 and when he chambers for turned necks the chamber runs .335.
I then measured the sized cases from my Redding FL sizing die and my Redding Neck Die and the sized case necks measured .330.
Here is where it gets good. Using Winchester brass and Sierra Matchkings I am getting a loaded round neck diameter of .333.
The manufacturers say to measure loaded round diameter, and use a bushing .002-.003 smaller. With standard dies, I am already sizing .003 smaller than loaded round diameter, but not really getting the benefits of less case sizing since the necks are being sized .015-.016 thousands of an inch due to the "Big" factory chamber neck diameter.
The question is in ya'lls experience is a .346 neck in a factory .308 Winchester chamber normal, and also for me to get the full benefits of bushing dies will I have to rechamber or rebarrel due to the big neck diameter?
Thanks in advance,
LeonCarr
I have been thinking about making the jump from standard dies to either the bushing type sizing dies or benchrest type hand dies for my Remington 700P .308. In preparation of ordering stuff and to make sure I would be ordering the right size bushings, I took some measurements:
The necks of the fired cases coming out of my rifle have an OD of .345. With an estimated .001 of brass springback, this would indicate a chamber neck diameter of .346. After consulting with a buddy that builds precision rifles, a standard SAAMI spec .308 Winchester chamber runs .342 and when he chambers for turned necks the chamber runs .335.
I then measured the sized cases from my Redding FL sizing die and my Redding Neck Die and the sized case necks measured .330.
Here is where it gets good. Using Winchester brass and Sierra Matchkings I am getting a loaded round neck diameter of .333.
The manufacturers say to measure loaded round diameter, and use a bushing .002-.003 smaller. With standard dies, I am already sizing .003 smaller than loaded round diameter, but not really getting the benefits of less case sizing since the necks are being sized .015-.016 thousands of an inch due to the "Big" factory chamber neck diameter.
The question is in ya'lls experience is a .346 neck in a factory .308 Winchester chamber normal, and also for me to get the full benefits of bushing dies will I have to rechamber or rebarrel due to the big neck diameter?
Thanks in advance,
LeonCarr
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