help me make sense of this?

[Black Beard]

Were they the same load as the velocity was dropping? Could be the barrel warming up.

[Parabuteo]

Have you considered a ladder test?

[sarge4318]

Have you considered binning the chronograph?

Don't sweat the figures, just shoot (ladder test groups like Chris suggests) and tweek loads from there to get a group you're happy with, then shoot over the chronograph and see what it says.

[Randy Bohannon]

A ladder test is useful when one can’t be bothered to work up the conventional way, I think ‘medic already has and therefore it would be pointless; especially as trusting one round to show over pressure is not a very good idea.

the node seems a grain apart from his data, he absolutely needs a chronograph if he is going to explore.

[Army-medic]

A ladder test is useful when one can’t be bothered to work up the conventional way, I think ‘medic already has and therefore it would be pointless; especially as trusting one round to show over pressure is not a very good idea.

the node seems a grain apart from his data, he absolutely needs a chronograph if he is going to explore.

Yes, I think I have passed the stage of ladder testing as the original loads were a result of an OCW test. Though admittedly to a maximum as stated by Viht. Which may be a little conservative in reality.

[Randy Bohannon]

Yes, I think I have passed the stage of ladder testing as the original loads were a result of an OCW test. Though admittedly to a maximum as stated by Viht. Which may be a little conservative in reality.

Would you like to borrow a chronograph, I’m not too far from you?

[bullbarrel]

Anything with an ES less than 25fps is very good.

I don't see whats wrong with either of these loads, if they are repeatable.

Series 1 Shots: 5
Min 2750 Max 2772
Avg 2765 S-D 8.8
ES 22

Series Shot Speed
1 1 2767 ft/s
1 2 2750 ft/s Group Size: 0.47 MOA
1 3 2770 ft/s
1 4 2772 ft/s
1 5 2769 ft/s
---- ---- ---- ----


Series 2 Shots: 5
Min 2757 Max 2775
Avg 2768 S-D 7.4
ES 18

Series Shot Speed
2 1 2775 ft/s
2 2 2773 ft/s
2 3 2766 ft/s Group size 0.44 MOA
2 4 2757 ft/s
2 5 2773 ft/s
---- ---- ---- ----

Whats wrong with a rifle grouping <1/2 MOA

[Army-medic]

Would you like to borrow a chronograph, I’m not too far from you?

Thanks for the offer but they published velocities were from my own magnetospeed v3, so I already have one.

[Parabuteo]

A ladder test is useful when one can’t be bothered to work up the conventional way, I think ‘medic already has and therefore it would be pointless; especially as trusting one round to show over pressure is not a very good idea.

the node seems a grain apart from his data, he absolutely needs a chronograph if he is going to explore.

Never used one when I shot FTR but trusted the results and the rifle. My ES was 6FPS (finally measured by 2 different magnetospeed chronos) and yes, if you attach anything to or touch a free floating barrel with anything, it will affect the harmonics. How do we thing barrel tuners work?

With high performance rifles anything you can do that reduces the time between changes is a bonus. Dont sweat the stats, they will as likley be different between days and groups. Just get out there real time and see how they perform on paper, thinking about the marksmanship principles and consistancy. And work from there.

[Randy Bohannon]

Never used one when I shot FTR but trusted the results and the rifle. My ES was 6FPS (finally measured by 2 different magnetospeed chronos) and yes, if you attach anything to or touch a free floating barrel with anything, it will affect the harmonics. How do we thing barrel tuners work?

With high performance rifles anything you can do that reduces the time between changes is a bonus. Dont sweat the stats, they will as likley be different between days and groups. Just get out there real time and see how they perform on paper, thinking about the marksmanship principles and consistancy. And work from there.

Your load worked because it had a single digit ES and grouped well, a chronograph will tell you that faster than a season’s FTR shooting, surely?

[Parabuteo]

Your load worked because it had a single digit ES and grouped well, a chronograph will tell you that faster than a season’s FTR shooting, surely?

It did not take a season. Nothing like. It was league FTR. Experience told me how to carry out the load dev, the chrono was pure chance when the MS came out, I tried a pair to make sure the first was not showing silly figures. Oddly I had a lot of other loads that worked too....I still do....without a chrono.

The point is that people get tied up in apps, chronos, electronic targets, and usually end up going back to shooting at good old paper and either being happy with the results, or not.

My only use for a chrono has been to determine whether a rifle was over the HME limit, or to get some basic data for developing wind charts. Tried a Labradar for this purpose a while back, heap!!!

Obviously sometimes you will get issues, but often too much data fudges the picture. The next time the OP works up a load it will take less time, etc etc.