Re: Ladder testing at 1k- Detailed article and video
Clarifying, my primary point is low ES and SD don't ensure 1/2 moa or better accuracy out of any rifle. If the gun prints 1 1/2 moa, the low ES and SD may help to ensure the down-range groups are circular rather than strung out vertically at long range, but you may as well be shooting buckshot as a rifle.
So the chrono can assist in ID'ing loads with potential for good long range accuracy and minimum vertical stringing, and it can assist in establishing MVs and down-range velocities for purposes of fine tuning ballistic software programs to get good predicted drops and downrange velocity matches, but the proof in the quality of the load is the POIs on down-range targets. And this can be done without any chronograph at all. Since down-range groups that have minimal vertical stringing have by necessity, also identified a load with low ES and SD. I agree with what I believe is being inferred; low ES and SD are required to prevent excessive down-range vertical stringing.
But I've read a number of accounts where shooters fine-tune their reloads simply by down-range target results. It may take them an extra 20 rounds of ammo, but by the time they're getting 1/2 moa at 1000 yds, that load will surely have low ES and SD.
So to go so far as to say I follow the chrono rather than the POIs is overstating the value of the chrongraph data in the bigger picture. If one were to say I believe and follow the POIs rather than the chrono data, then there's no arguing the merits of that position.
Bottom line, chrono data can help lead to more efficient load development, as well as the fine tuning and tweaking of ballistics software. Which is a big deal in itself. I use two of them set up in series whenever I can. But they aren't the final confirmation of anything other than bullet velocity.
Last edited by phorwath; 05-29-2009 at 03:11 PM.