Only have one rifle braked , my 338-416 Rigby Improved......it needs it from shooting in the prone position most often with it.
Have several 300's, 338's, 375's and even 416/458's that don't require brakes.
Get a good recoil pad like a Pachmeyer, should tame a 300 to be tolerable, even though the recoil is not what I would call obnoxious.
Cheers.
We all respond to a thread according to our own experience I suppose....So - not knowing yours - or the OP's....I wonder what if your "experience" had been that you had been blown up a couple of times, and due that - had your shooting shoulder ( and other parts...) re-built?.....

You may want to reduce the load on that shoulder via a good pad for sure - but the brake is the most effective way to make recoil more manageable for someone that has:
1. not a lot of experience -or
2.may have developed a pain sensitivity flinch -or
3. injuries/age related issues.
Brakes help a lot of folks stay in the game that may not find it as fun otherwise. I have braked and un-braked magnums as well....but - if I am going to be at the range all day, and shooting for fun and not hunting - it used a BRAKED rifle. The warranty on several of my parts has expired according to the various surgeons that have put me back together over my time as a younger and possibly more bull headed individual

....and it is just the attempt to take a balanced approach to my shooting so I can enjoy it as long as possible. I have much less of a "one way" to accomplish things perspective. Just me.......