I probably should have elaborated a little more in my previous post.
From my limited understanding (remember, I've only done a little reading on this and am by no means an expert on the cartridge), it seems initially there was a slight difference in the cartridge specs and the reamer specs. If you look at the drawings in the link I provided you will notice that the SAAMI spec was issued on 1/21/2019 and then revised on 4/9/2019. I'm not sure what was revised though.
As far as I can tell, all the factory loads are using .357" diameter bullets. Winchester has made available their
145gr FMJ bullets and
180gr Power-Point bullets for reloaders, which are .357" diameter. Most of the .35cal rifle bullets (.358" dia.) are 200gr and up in weight which may also require a faster twist rate. Given the .350 Legend essentially runs out of gas at around 250 yards with the 180-grain and down bullets, I really doubt you'd see much benefit from the heavier bullets.
What I would recommend is 1) do as much reading as you can online, and 2) talk to a couple different barrel makers offering this chambering and let them know you wand to be able to shoot .358" rifle bullets so they can best advise you. There should be a decent amount of information out there from actual owners and reloaders of this round to help you make a more informed decision.
Things like this are generally why I don't rush out to jump on the bandwagon when new cartridges come out. I like to let everyone else be the guinea pigs for the first year or two to iron out the kinks. It also lets me get a good feel on whether or not it's going to be a lasting cartridge or just a flash in the pan that fades fast after the novelty of it being new wears off.
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