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You're kinda defeating the purpose of the norma by throating for 245s. You'll be long enough that you won't be able to use dbm or standard 3.85" wyatt's box. You'll need a 4" cfe9 to load close to lands. At that point, use a lapua or rum. As they have more capacity to push the 245/250.
Barrel length? I used N570 in my 300nmi with 245s, granted I'm at 250k freebore. I had a nice wide node @ 2990-3010 fps. But its on the WARM side lol. This is a 26" proof 9tw. Pierce 33° chamber. Also on a side note......250s for hunting? I know Broz killed a handful of elk with them from a 300 lapua improved. 3200fps or some craziness. He went away from them after inconsistent expansion on animals at various ranges, from mid/long to long.
It barely fit in my cfe12 box, so roughly 3.82" I was seated 45k off lands, I just shot a 400y ladder with them for testing last summer. 88.5-89.5 was 2990-3010 and held 1.5" of vertical. 45k off was recommended from a fellow shooter who's quite accomplished, he found it worked well in his 300nmi, that's a Wheeler build.
Running 40k off, 88.2 with 3.715", not improved - shoots very well.
I used Alex Wheeler's reamer print (AW2) and added .025" freebore which put it at .300" of freebore. I plan to run the 230 Hybrids or A-Tips but wanted the option to run the 245 EOL or 250 A-Tip as well. I'm running the CFE-12 box which allows 3.835". The 230 Cutting Edge Lazer bullets seated at 3.820 so even though they are listed as a single feed bullet, they will fit in my magazine.
