Hello, I can't really address your rifle/cartridge choice however I can speak to the LE side of things....not sure what state you're from but I've been in the career out here in Crazyfornia for over 20yrs. Been thru the various assignments including SWAT and Sniper, (both as an Operator and Commander) and moved onto supervision roles now. Being thru more than a few officer involved shootings, my advice would be to not get fancy with caliber and having to reload your own "duty ammo" Your state may be, (and probably is) very different than mine, however I have to assume that whatever state, if used in an on-duty incident your rifle, scope, ammo and whatever else is attached to it will become evidence until the case is more than likely adjudicated. It will be tested by your state crime lab and anything custom or not department standardized will take a fair amount of explanation on the stand during the trial, even more so should something go horribly wrong or unexpected!! LE Sniper shots are generally short in distance but require a high level of accuracy under some of the most demanding scenarios. The reason why most agencies near and far use the .308 is because it simply works for the task. Its not fancy, certainly not "cool" anymore but its been through the ringer. I'm sorry to be a nay-sayer but would hate to see a nice semi-custom rifle being stored on the evidence shelf in the crime lab.....best of luck in whatever you decide!!