Depends on what makes you feel good while shooting in the off season and day dreaming about seeing elk hair in the scope. For me, seeing a 338 size hole in the muzzle makes me grin a little every time and never gets old. There are old photos of young me shooting prairie dogs, deer, antelope and elk with it all smiles. While carrying it in the mixed timber, especially in grizzly country, I feel like there’s no better cartridge for what I’m doing. It also just seems fun, like my buddy’s hot rod with a big cam and loping idle. Like every time I pass the old 1985 3/4 ton ford in the driveway with 2006 F350 running gear. Get the cartridge that makes you smile, shoot it within limitations, and it doesn’t matter what it is. Heck, for some people the perfect elk gun is a big revolver and they squeal like a little pig full excitement pulling the trigger at close range.
To be honest, it’s a fluke I ever owned a 338, but by the time I had saved enough money, the 300 wm was sold, so it was either wait two weeks or take the 338 home that day. lol In many ways the 300 is a better elk gun. It’s flatter shooting, bullets retain more velocity down range, easier on the shoulder, ammo is easier to come by, and by sheer numbers is one of the most popular elk guns in the west. There’s nothing wrong on paper about any 300 mag. I have barrels for 300 WSM, 300 SAUM, 300 RUM, and 300 PRC, but if you run into me at a trailhead in Western Wyoming I’ll either have a 7 mag if it’s primarily a deer hunt, or 338 is it’s primarily for elk. I can come up with a good argument for a 300 to replace both those cartridges, and did run a big 300 for a few years before switching back, but each just feels right for what they are used for. I’ve even given up a 338 and just used a 7 mag for everything, but I keep being drawn back to having both. It’s a sad day when we’re forced to only have one elk gun.