I finally made it to the range for some 6.5 chrono data.
Temp was 77. Pressure was 29.39 inHG. 72% humidity.
Loaded SMK 142 over 42.5gn of IMR 4350. Hornady brass once fired and trimmed. Full length resized.
Data is for 30 rounds measured by Competition Electronics chrono. 24" barrel.
Avg 2702
ES 27
SD 9
Strelok Trued the MV to 2815 @ 85 degrees,
produced hits at 1000.
Was going to say either you are loading it light, or your chrono was off.
I'm getting 2790 from a 175g 308 bullet. For a 142 in 6.5 you should be faster.