I think I would pick the 30 AR over the .223 based 30's if I just wanted something different. Handloading, there isn't much I can't make the "old" 308 do, except fit in a 223 AR 15 mag. Without that constraint I would just pick it, nothing special need be done with a 308 bolt gun from 150 grain cast and coated plinkers using pistol powder up to power levels none of the .223 based 30's could ever achieve.
Thats true, but a 30x45 would be cool for someone who already has a small bolt faced gun.
As long as the cost could be kept down.
So i couldnt find any cartridges in quickloads that were what we wanted, so i made a cartridge profile based on the simply expander ball necked up case i made.
All number are aproximate because i dont have the correct tools to measure the dimensions accurately
case length 1.73
base to shoulder length 1.435
shoulder length.043
neck length.235
base dia .376
large dia of shoulder .351
dia neck at base of shoulder .325
neck at case mouth .324
Water Capacity 33.1 avg of 5 tries
For the quickloads numbers the only inputs i could really change (that i could find, im not real good with quickloads yet) from the WT was the case length, and water capacity.
anyway here are the numbers QL spat out
Used a COAL of 2.415, which puts the 125tnt right at the base of the neck on my theoretical case.
I used a max pressure of 60K, which is higher than the .223 map of 55, and lower than the x45 map of 63ish
imr4227 max loads are at 103% capacity, 24" 2600, 20" 2522, 18" 2478, 16" 2466
imr4198 max loads are at 115% capacity, 24" 2653, 20" 2573, 18" 2529, 16" 2474
Not posting actual charges because of all the guess work here.
x39 does pretty much the same at 10Kpsi less