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.308 pressure issue

That's 5.56 Nato vs 223 Remington chamber....not 308 Winchester with the long throat on the military chamber for their longer 62 gr bullets over the orginial 55 gr fmj.
All sporting arms manufacturers use SAMMI finish reamers.
That's the idea to standardize all sporting arms so all the ammo will fit all the mass produced 308s.
Gunsmiths can change that on individual rifles like Ackley improved, but all Winchester, Savage, Remington 308s should be very close to identical.
Not going to argue the point but you are wrong. Remington's 308W have a long free bore and it is not per SAAMI. Try and load a 168 SMK 0.010" off the lands in a 700 and only the boat tail would be in the case mouth. No, it is not just my rifle. Those of us who reload for this rifle are familiar with this.

SOLD 6.5 PRC Pierce Engineering Skele-ti Ultralight Titanium Action & Proof Barrel & AMMO/MAGAZINES/CHASSIS

Whats the weight? Carbon fiber barrel? Would you seperate barreled action? Looking for trades?
The action is 15.5 oz. It has a carbon-proof barrel and is very accurate. I just don’t have the time to shoot anymore. I would sell the barreled action first, followed by the chassis.

I want to build (or maybe buy, if I must) a precision .308 gas gun

Buy an sp10, Lmt or Kac and be done. I built a 243 last year for my thermal coyote rig out of all super nice parts and I’m still dicking with it trying to get it to run like I want.(I know what I’m doing also) just couldn’t find what I wanted in the cal I wanted.

Can't get comfortable on my ranges shooting tables...

A lot of ranges have the concrete blocks for the uprights, taking the easy road with full blocks vs. using a 4" cap. I despise those tops that have what I call "Fudd" shapes to them. On those tops I will use the end as it's square, not as wide as I would like but it's better. OP, in absence of a tripod, you can take the chair, place it on the table, use a bag and rest the rifle on it. That will give you standing, I also will use the seat for kneeling. The extra thick garden pads are good to use as a booster or use you rifle case if need be.

I do have this, use it from time to time, well built.