I don't own one but you have plenty of room magazine to seat bullets out. My nephew is shooting 338RUM he used Bartlein barrel and I shot 300 RUM for couple year as well as custom 338 mag.
You got the 250gr/300gr AB plus the Berger.
https://www.33nosler.com/ballistics/ You have to click on what you want to look at.
I think it be a good one for 338 fans.