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Factory R700 LA: Very long throat or my imagination?

ChrisBCS

Sergeant
Full Member
Minuteman
Feb 8, 2014
312
0
So for a .30-06 cartridge with a 175 SMK to touch the lands, the COAL must be 3.455", with a case trimmed to 2.484". So with a 1.242" bullet, that's a 0.271" seating depth. This is a highly reproducible number. Multiple dummy cartridges. So, even 0.03" off the lands is 3.425". Does that seem ludicrous to anyone else? I have only been single shot testing on my LD, and while this length does fit in an LA magazine, I'm getting worried about feeding hangups.
 
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Factory R700s can have ridiculously long throats on them. My 7 mag had to be loaded out insanely long, especially near the end of the barrel life. I was loading them out so long I started worrying about them being loose.

Then I backed it off the lands a ways because I figured if factory ammo (which is much shorter) provided accurate results, there was no need for me to punch my hand loads into the lands.
 
I would not worry about it too much and stay away from the bullets with short bearing surfaces. The 180 and 190g bullets have long bearing surfaces if the 175's don't shoot well loaded short. Seat the bullets so the base of the bullet is at the base of the neck or a little below that and go from there.