Re: 338 norma mag or 300 norma mag
Not sure if your stuck on the 30 cal but i had a buddy shooting a 300 win mag that was necked down to 7mm and Ackly improved , he wanted that so he would shoot with a 7mm STW speed wise bug have a shorter OAL or so he could seat VLD bullet out farther or somthing.
Anyway , i saw him shoot 2 deer at over 600yds with a 162 A-max launched at around 3100fps and the results were impressive.
I think you could probably get a regualr 7 mag close to that with alot less fuss , in any case the heavier high BC bullet in 7mm sure work well at longer ranges