I don't believe I've ever heard of anyone using H414 in a .308 w/ a S175MK, successfully or otherwise, before this.

Varget or RE-15 are pretty much the defacto standard. N140/N150, H or I4895 are a few others commonly associated with the .308 Win.

My RE-15 load is a bit warmer than the one previously mentioned... 43.8gr in a Winchester case will shoot just disgustingly little groups out of most half-decent .308 rifles. It's pretty close to the load used in M118LR ammo, IIRC.