Hi going to purchase a mcmillan for my Rem700 243 SPS Varmit but im not fortunate enough to shoulder one in person and having to wait 8 months after putting deposit down need any advice or help on the style. The rifle is mounted with a nightforce 5.5-22x50 MOAR and will be used for spot lighting foxes using a bipod or backpack. Then I might go goat pig hunting which might require lying down with a bipod or standing position against a tree. The A3 sporter was recommended by the dealer down here but my concern is with the drop in the butt designed for quick shouldering shots will the butt be too low on the shoulder with a nightforce 5.5-22x50 lying down shots compared to the A5 and would the adjustable cheek piece be worth adding?. I will have a sling on it as well for hiking as required. I will use this calibre for 400-500 yard shots and maybe farther as I get it tuned. Any help would be greatly appreciated