Starting point question

[SDHNTR]

I've read that wsm bbls have shorter life. True or?

Again, see point 1! I’m building a .300 wsm right now and it’s way, way at the bottom of my list of concerns.

 

[SDHNTR]

And to answer your question more directly. I vote no. Barrel burners are overbore. Lots of powder and a small bullet diameter. Or high powder to caliber ratio. That concentrates an intense flame in a small area, like a cutting torch and it wears out the throat and the start of the lands. The .264 win mag comes to mind, .257 wby, 22-250, etc. But still, we are talking thousands of shots. Absolute non issue, imo. Letting the damn bbl cool down between shots will go a long way too.