The 350l is one of the few new cartridge that I have seen a use for.So what makes you claim that .338WM , .458WM are obsolete or becoming obsolete?
There may be a "new breed" , but the calibers being lauded by influencers are just "pigs in a poke" , there is a reason .358Win & .375Win have seen a resurgence , effectiveness in tough terrain with heavy vegetation. In the past 5yrs I've seen more of those travel through hunt camp than any of the other "new hotness". I mean hell, they rolled out "350 Legend" , spent untold $$$$$ on advertising & digital influence & it still can't measure up to 30-30 in terminal ballistics , on paper its close, but actual lead to meat, 30-30 still wins. Then they dreamnt up 6.8 western, which is just a shorter .270WSM , which admittedly, .270WSM is another redundancy .... but they developed 6.8 Western to reduce recoil?! What in the crap?! Bunch of dam sissys if they can't manage recoil from a .30 calber or under.
Here we are in a forum that promotes hunting quarry which requires effective BC / legit TB , but at the same time are dismissive of the blatant campaign of planned obsolescence.
I made this post hoping there would be credible insight, instead what I found was validation of what I have long feared.
Ar15 upper make for a cheap near 30-30 cartridge
Low recoil it has started a lot of new deer/ and hog hunters hear.
And it’s way better than a 223 for that job.
And then for what it was made for the stright wall cartridge states.
The 30-30 being better doesn’t matter if you can’t use it.

