SmallCaliberCentral

what is an exceptable spread for the 308 win. my best load to date is givingme around a 75 fps spread. it gives me 1 to 1.25 groups at 100
Cracker

Personally, I don't pay a lot of attention to velocity variations, it's how it prints on paper to me. I've seen several times where the tightest velocity spreads produced subpar groups as compared to those with wider FPS extremes.

Another side is there are a lot of variables when it comes to chronographing and they too have to be taken into the equation.

Don't if this answered your question or not though...

I cant really answer that question, however I have noticed that my ES has dropped significantly since I've moved my chronograph a few more feet back from the muzzle. I was probably at 10 feet and I've extended it to about 14 feet and it seems to give me more consistent readings.

It depends a lot on the range, the size of your target and your standards. With a 178-gr A-Max, 75 fps makes about two feet difference in POI @1000 yards.