Thanks everyone... Still lots to consider. Going to have to run some more figures on the projectiles that I'm thinking of running. My shorty 308 and other barrel is 1/10 twist, so running those using the 168s will already be easy to do...
But yes, to affirm, I am thinking 16-18" barrel carbon fiber, either 308 or 7/08. The "heavy" 7mm projectiles I was thinking was into the 150-160, as i'm not sure that the 170s would benefit me at mag length... The Hammers I was looking at would be the 145gr, using the fast twist barrel from X-Caliber... that "should" be equivalent to roughly the 165TGK that Sierra has put out. If that's the case, then comparatively I'd be looking at the 308 in 175gr or higher for the 308 with respective BC and bullet length. I may be slightly off base there, but the intention would be the same.
I was opting for the heavier end of the spectrum to try and get as close to the G7of these projectiles, but I know I'm pushing the envelope a little. If I look over the last 40 or so replies, I'm thinking of maybe just staying in that 140gr range of .284 projectiles, and just focus on the higher BC ones out of that sample size.
My range is limited just mostly to practicality, and yes, there is a nice range in Brownfield. It's a little costly, and my time would be limited to only on Saturdays. Just not economical sense for me yet. If I lived a little further that direction, it might make it more worth it, but it's about a 40 minute drive from my door step.