All the x66/370 did, was basically achieve what handloaders have already been doing with the x62 when pushed to modern pressures. Typical Euro/Metric round in 'Merica....dumbed down. Load it up to 60-64k psi and it meets/beats the x66. Of course no telling if the 370/x66 could be pushed harder. Either way, I've seen folks on here, and AR, give up some recipes to get 286's up to the 2500 mark, and 250's up to 2700fps. More or less what the x66 is doing.
