Re: hand loading Remington SPS varmint .308
I've loaded for 3 Remington SPS 20" barrels, 1 Remington 26" varmint barrel, 1 Accuracy International 24" barrel, all in 308.
I wanted a load for long distance primarily, but they all grouped well at 100yds. also. I tried several bullets, powders, etc. The 168's just don't cut it beyond 650yds., for me anyway.
The 175's carried much better stayed trans sonic much longer , had more energy and grouped much better at 1000yds. and beyond. I used Amax's, Berger's, SMK's. I finally settled on SMK's due to performance and availability. I have nothing against the other bullets mentioned, but due to a combination of grouping, cost and availability I stuck with the SMK's.
I've found the following to work extremely well in several different rifles, you might give them a try in yours. Please work up to these loads as 45.0gr. is max with these combos according to Hodgdon.
20" barrel Remington
44.8 gr. Varget
2.222 measured with Hornady bullet comparator. @ .002 longer than factory OAL (Mag friendly)
26?? fps (I'll have find my notes)
24" barrel AI
44.6, 44.8, 45.0 Varget (I went with 45.0 because of velocity, as all 3 charge weights shot well)
everything else same as above
26" barrel Remington
everything else same as the others
The 26" load was hands down the best for that barrel length and for some other people who tried it in their 26" also. The same can be said for the 20" barrel load as used in 3 for me and a few other shooters also.
I full length resized, uniformed primer pockets, deburred flash holes inside and out, used a micrometer bullet seater and measured with a bullet comparator. I can't guarantee that these will work for you as well as they have for me, but I would be very surprised if they didn't.
Good luck, JH