I believe as you have shown with your low power variable optic (LPVO) scope selection that that the 3 gunners have done a service to further the development of the Cooper practical rifle concept....I started shooting serious (for me) 3 gun in 1995 with my first of four North Carolina Tactical matches put on by SMSgt Kyle Lamb...at the time, my sight was a 1x holographic sight, and pretty typical... but in the next year or so, some of the guys like Jeff Cramblit were playing with 1-4 power optics, and more of the top name shooters were paying attention... during the 2005 Ft Benning 3 gun Challenge, my 4x32 ACOG was handled by quite a few National Guard and Reserve NCO's looking to equip their troops gearing up for Iraq, but by 2010 a fixed sight 4x was sadly looking out of date on a multi gun game rifle, even though the Bindon Aiming Concept worked well on close targets, and it's ruggedness and bullet drop compensation was not really appreciated in lieu of the additional cost.... and by the last of those matches I shot in 2010 all the top shooters were using illuminated 1x4/6 LPVO,
my first attempt at a Scout Rifle was with a Mini 14 in the middle 80s, with the addition of a scope mount by Ranch Products that allowed a Bushnell 2 1/2x EER pistol scope to be mounted on the top of the gas block....