Re: 30-378 And Bergers
If he is worried about throat erosion he should get a 308. I would try Berger 210's my 300 WBY loves them. I have them .020 off the lands.
I do not think seating depth will have any impact on throat erosion.
USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94