I bought an SPS Varmint in .308 2 years ago. I mainly bought it for the barreled action as I knew the cheap stock would be replaced right away. As I am a lefty, I was limited as far as stock choices. I bought an H-S Precision Sendero within a couple months of getting the rifle. Even before I started upgrading things I was getting pretty good groups at 100 yards, 10 shots with almost all through one ragged hole. I was using Hornady 168 grain Match bullets with 42.5 grains of IMR-4895 in neck sized Nosler brass. The H-S stock has more mass and fills your hands better than the SPS stock and felt recoil is less. I had the same experience as others in that the X-Mark trigger, while crisp, did not really lighten up any when adjusting it. Mine was 6 lbs out of the box ( so much for the tag Remington put on the trigger guard saying 3 1/2 pounds from the factory) and adjusted as light as I could go it was 5 lbs. So out with the factory trigger, replaced by a Timney, it now pulls @ 2 lbs.
I mounted a Nikon M-308 4-16x scope, great scope for $500 or so. Side focus/parallax, comes with a killflash filter and BDC reticle. There is also the elevation turret calibrated for a .308 Match bullet @ 2650 fps. I used the excellent DNZ one piece base and ring set.
The 26" barrel was just too long so I cut it to 21" and recrowned it. It's been raining a lot lately, I got out once a few weeks ago and shot it with the shorter barrel, my loads are getting a little less than 100 fps short of what the long barrel got. One thing I have yet to do is get new bottom metal and a few detachable magazines, it is a pain to have to top load more than a few at a time. I'll probably get the H-S kit from Brownell's, the H-S magazines are pricey, but it'll drop right in to the H-S stock with no hassles.
I picked up a few boxes of Sierra 168 gr. Match and loaded some with 3 different powders to try, Varget, W748 and 4064. I had run out of 4895, but need to get more. Target is a 10 shot 400 yard group on a very windy March day in North Dakota. Last 2 pics are of the M700 now that the barrel is shorter.