trying to figure out why my MV ES is as high as it is (40-50fps), given I make sure that my loads measure exactly the same each time on my RCBS scales. I even double check the throw on a second RCBS model scale and they match perfectly, well to the 0.1 grain digit, and the spec for this scale is +- 0.1 grain. Which indicates that I could have an ES on the reload of 0.2.
Then we have to throw in the CED chron accuracy, which is +- 1% of the velocity (or better they say... well thanks for that). So even if everything else, including powder throw and case capacity, etc. was perfect, the chron, at 2700fps could report anything from approx 2673 to 2727, for an ES of 54.
Hard to conclude anything. The chron might be doing better than 1% in which case my loads truly have some ES, or the chron is closer to +-1% and my loads are actually doing pretty good.
I suppose the true test is vertical variance of the holes at say 300 yards where you know you have the scope center very accurately fixed on aim point.... Need to get to my other range with >100yds and see what that test says.
Then we have to throw in the CED chron accuracy, which is +- 1% of the velocity (or better they say... well thanks for that). So even if everything else, including powder throw and case capacity, etc. was perfect, the chron, at 2700fps could report anything from approx 2673 to 2727, for an ES of 54.
Hard to conclude anything. The chron might be doing better than 1% in which case my loads truly have some ES, or the chron is closer to +-1% and my loads are actually doing pretty good.
I suppose the true test is vertical variance of the holes at say 300 yards where you know you have the scope center very accurately fixed on aim point.... Need to get to my other range with >100yds and see what that test says.
