Agreed. I went the 300 NMI route. I'm happy with it so far but after seeing a 30-338 LMI, I'm wishing I had just gone that route.agreed. I'm happy with my .300 Winnie. If I ever do build a custom rig I'm going for broke and building a .30-33xc off Peterson xc brass. Dimensionally similar to Kirby Allen's .300 Raptor or Broz's .300 High Country Magnum from Long Range Only. Budget friendly option would be the single shot savage 112 magnum target action.
Because you're absolutely right. It's hard to meaningfully exceed the .300 win mag in a .30 cal without needing impractical long barrels, impractical overbore cases, and much much more expensive brass (no matter the case) and rifle builds (to say nothing of the powder budget nowadays). So if I'm gonna be spending an impractical sum on an impractically huge .30 cal I'm going all the way dang it!!! . No point in being "a little better" for so much more investment.
The .300 win will probably always be my favourite centerfire rifle for this exact reason. It's just so darn hard to beat PRACTICALLY. Ballistically, for versatility of application, for being semi-economical, for everyone who's anyone making good brass and rifles for it, and so on.
At present I own 6 centerfire rifles, a .243, .257 wby, 270 win, 300 win mag, 8x57 mauser, and .358 Norma. If, God forbid, I could only keep one it'd be the .300 with no hesitation.
Go big or go home?