What's the consensus on 338 Lapua 300gr SCENAR cartridges? Good to go? Best in class? I'm looking to buy some for my AI AW .338 Lapua with a 30" Broughton Barrel in 1-9.3 Twist Is this or would this be a good choice? I know it is pricey stuff, but I am looking to get it for $4.50 a round.