Shoot sorry. I didn’t read that correctly. I just read it as did mike chamber the 338 Norma..didn’t even register the improved part. It’s a standard Norma, not improved. My bad. Would it be possible to have the barrel chambered in 338 Norma rechambered to his improved version? Or would I have to lose too much barrel?His improved chamber is probably the most aggressive one out there thats on the 35° shoulder. Idk if the 338 version moves the neck shoulder junction forward like the 300 version or not. I would suggest a starting load with N570 at around 88-89gr. That should have you in a 2650-2700 fps area. His 300 version is 108gr capacity and 338 should be 109. My 338 rum is 110 so the data should correlate fairly close. My finalized load is 92.7 gr for 2850fps in adg brass with 28" barrel pushing 300 elite hunters.