I have recently acquired a Centurion Arms SPR barrel and am working on a load for it. As I rarely have an opportunity to shoot past 200 yds I've settled on a 69 gr bullet for now. I do realize that I will have to try everything first, as every barrel is different. I'm just wondering if anyone would care to share their experiences between Nosler's 69 gr HPBT and the 69 gr SMK. I do believe the barrel I'm using has been "optimized" for the Sierra bullet, it's just that the Nosler's appear to be nearly identical, but more cost effective.