Considering his application, "short barrel" and the desire to use .338 Lapua Brass, why wouldn't he be better off going up to .375? "375-338 Lapua Improved"I have built many 338's for different purposes and for the 338 Lapua you are going to be limited to 24 to 26'' barrels for any performance. The smallest and lightest 338 that is still a performer is the 338 RCM (A short mag that does well at 22" of barrel. The 338 rum is the ballistic equal to the Lapua using less powder but when you get to this level a 26" minimum barrel length is needed to get any real performance. I would recommend using 250 grain Bullets for this class of cartridge. Then there are the cartridges that consume 115 or more grains of powder and they need at least 28 to 30" barrels or as stated, they become flame throwers and not only waist lots of powder they also erode barrels fast from pushing un-burnt powder all the way through the barrel.
The 338 RCM will push a 225 grain to 2700 + with the 22" barrel. the 338 RUM will push a 250 grain to 3000 ft/sec in a 26" barrel and the Lapua will do 2900+.
The short mags use less faster burning powder to reach the max pressures in shorter barrels so you might consider an Improved short mag on a short action with a 24" barrel to save overall rifle length.
Big High velocity bullets need longer barrels to reach their potential unfortunately.
J E CUSTOM
Longer cartridges need longer actions and normally have more case capacity requiring more slow burning powder that needs a longer barrel. The short mags are very efficient at getting velocity with limited barrel length.Considering his application, "short barrel" and the desire to use .338 Lapua Brass, why wouldn't he be better off going up to .375? "375-338 Lapua Improved"