My most spectacular shot was in 1990 on a Coues Whitetail buck that jumped up 50 yards out and was headed to the next clump of trees. My rifle was a 1903 SPFD 30-06 with the original 24" barrel in a wooden Fajen stock with a Lyman 4x scope build before1956 (the year I was born). When the buck jumped I raised my rifle to my shoulder and swung on him much like I would a flushed quail or a mourning dove that suddenly swooped into view or a flight of ducks zooming your decoys unexpectedly. I was able to put the 4X scope on the buck and get the cross hairs placed on his ribs just aft on the shoulder and as I squeezed off the shot I could see that his nose was just disappearing into the branches. the bullet clipped off the top of his heart and he was DRT. First off I had decades of wing shooting experience that made all the difference in the outcome of this snap shot. Second the rifle although not light was not heavy, more than 7.5lbs but less than 8.2lbs. Third with a full sized stock and 24" barrel it was not compact. The rifle was well balanced and the stock fit perfectly and felt and handled much like the shotguns I hunted with. I bring all this up because you want a rifle you can "whip around offhand". Excellent fit and a natural shouldering stock that comes to a good point of aim is top requirement. I am not big and not small so anything lighter than 7.5lbs feels whippy and not solid. Much over 8 pounds and rifle starts to feel chunky. Balance is equal to stock fit when it comes to a handy rifle. A good trigger set for a reasonable weight of pull for fast action (for me this is 3 lbs). I have a 7lbs REM 700 in a kevlar stock topped with a Swarovski Z3 3-9X36, I find the rifle to light but the scope is great. The Z3 scope line gives you good optics, several choices in configuration and they dial down to 3 or 4 power. Long or short action no matter, 20 to 22 inch barrel will work and probably do fine with any 30-06 or 308 based cartridge. The rifles I have hunted with that are inline with your requirements are a rem 700 270 win with a #2 or was it #3 24" lilja barrel in a traditional Brown Precision kevlar stock with the smaller Z3 3-9 scope. I found the rifle to be almost to light but it shot fine. The other rifle I hunted with was a older Remington MOD 7 7-08 in SS a 20" barrel and in the gray plastic stock they used at the time with a smaller Leupold much like the Swaro Z3, loved how handy that rifle was and used it twice on off hand shots. The suppressor could complicate balance but between scope, stock and barrel weight could get that to work. Lastly you do not see chassis stocks used by wing shooters or on the line at silhouette matches. Good luck, hope this helps formulate your design.