My brother has a Browning BAR in 308 caliber....
They are good guns but I hate the fact that 70% of the factory ammo you feed it give you give you 2.5" to 3.5" groups... its a pain in the a$$ trying to test factory loads that give you better than 2" groups @100....
Here is some numbers for you to consider...
--winchester power points, cheap 12 dollar box, 150 grainers, 3.5 to 4" groups
--winchester power points, cheap 12 dollar box, 180 grainers, 2.5 to 3" groups
--federal cheapo 10 dollars box, 150 grainers, typical 4" groups
--federal cheapo 10 dollars box, 180 grainers, 3" groups when the barrel is cold... if the barrel gets hot, typically gets under 1" groups, this load is soooo wierd