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Bottom Metal for Coup de Grace Build

In what way?

Also, I just got off the phone with someone at Hawkins who cited all kinds of fitment issues with the CDG receiver. Surprises me because ARC recommends their bottom metal. 🤷 I did see a recent thread about problems feeding 7mm-08 specifically in their proprietary Hunter magazines.
If you don’t mind the barricade stop, I would absolutely recommend the MDT bottom metal instead, and I own both. The only reason is they have the adjustable mag latch, which is necessary to get optimal feeding for most (not all) rifles. I used it for a terminus build recently, knowing it was a 3 lug action and was able to easily adjust the latch to get the mag feeding smooth as silk.

BUT, as I said in my original post, the Hawkins has worked perfectly for me.
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Geissele Super Duty or LMT MARS L-5.56 16in

LMT Lower, White OAK UPPER, 20” Wylde chamber, Geissele National Match Rail, UBR Gen 1 Stock.
Geissele National Match Trigger. Hi-Lux Gen1 scope. I have the Gen 2 scope sitting in the box to try.
The shooters like the weight of the GEN 1 UBR and White Oak had MagPul make a special run.
ACCURATE!!!! HEAVY!!!!
Using Bob’s Sled, it’s single feed device, drop round in chamber hit either dusl control mag releas, fire, bolt holds open for the next round.
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I do love the white oak uppers ( I have 3 of the national match uppers all with Bartlein barrels). Spectacular accuracy ❤️.

510 Whisper Build Advice (Stock/Bottom Metal/Magazines/Twist/Barrel Length)

The reamer drawing I have has the chamber at .539, so probably less than that. You'll probably have to figure out what works with your chamber/brass/dies.

I appreciate the suggestions 45-90! I would be ecstatic with 200 cases per hour, as right now I'd be lucky to do 10. I think my biggest mistake is trying to bottom out the mandrel and move the carriage to a stop rather than feeding it with the tailstock. I will probably just try using a reloading press shell plate mounted to the tailstock to make removing it while running easier for me.