the humble AR10 belongs on any list of “best sniper rifles” IMO. A quality AR10 is capable of bolt action like accuracy and rapid follow up shots making it the ideal weapon for engaging multiple targets or for recovering from a miss or for providing precision suppression fire or for ricochet fire or for shooting through cover, etc. It should be number one on the list IMO.
Prolly need to ask all the one shot sniper killed folks out there which one they think was the best one they got shot with.(?)
Nothing in sub .299 caliber should be considered.