BP, expense is kinda where I'm at. Serious enough, yeah, but no I don't know everything about both either cartridge to tell you why I prefer one over the other. It's more I have more interest in a .300 than a 7mm. With that though I've really been thinking about changing one of my .308's to a 7mm SAUM. Hoser, my end purpose is another target rifle, hoping to keep it under 15lbs to use it once a year as an elk gun. One of my reasonings for wanting to go .300 is barrel length. Seems no one wants to run 7mm RM under 26" and prefer longer. I hear more about the .300 being ran at 24" lengths with good results. Now this is all from reading not real world experience. Hoser, I know your around the long range circuits a lot so if you can comment on this great. Another reason is I have the 7mm RM sitting, its got a pencil thin fluted barrel and couldn't run a string with it without it overheating and changing POI. So I planned on truing and rebarreling anyway even if I stay with the 7mm RM.