OP, I took some apart over a year ago.
Norma cases in the 222.5 -223.9 gr weight range
Suspect Federal 215M primer
3.600" avg COAL
Powder was about 78.3 gr and appeared very visually similar to Ramshot Magnum.
Curious enough, my Ramshot Magnum load is currently 78.7 gr...
LMAO!!! Most of my hand loads for my rifles you can cover 3 shots with a dime. But yeah, if I ever ran into a rifle that would shoot factory ammo like that, I’d probably buy the store out if it!!
I’ve seen 1” groups with factory ammo, but mostly not. Lol!!
Yep. Ran them a while back like that.
In my old Rem 700 rifle, load was:
75.3 gr H1000
BTO 2.910" .005" Jump
AVG 3000 FPS
Shot a few Muley Bucks with that load. Always aimed for the crease and got in behind the shoulder. Complete pass through with caliber...
Worked up a load for the 208 ELDM in my 300 RUM.
Started with the 208 primarily because it's a little less expensive to shoot, wanted to see if this barrel would shoot without wrapping too much into it, and I had plenty of them.
I PM'd a couple guys here for a start. Have about 60 rounds down...
Between the 2 options given, and intended use, I'd get the 300 RUM.
I you think you'll want to go heavier in bullet weight than 210-220, I'd for sure give the Browning Max Long Range a serious look. 1:8 twist 26" barrel. Muzzle brake. Relatively light.
I have tried RL33.
I have a Remington Sendero SFII in 264 Win Mag.
That load looked like this:
74 gr RL33
147 gr Hornady ELDM
Fed GM215M primer
Case length 2.490"
Base to shoulder 2.113"
Base To Ogive 2.767" .010" Jump
Worked up from 70 grains as no data...
I do plan on braking the rifle.
I may just shoot it a couple times unbraked, so I can appreciate the work and money to brake it... that, and I don't want to have to turn my man card in and get a 6.5 Creedmor...
Funny. I have 5 300 Win Mags, and you have 5...