help me make sense of this?

[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]

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.



Whats wrong with a rifle grouping <1/2 MOA

With factory ammo the groups were a single ragged hole.

[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.

[Randy Bohannon]

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

Aha!

were you shooting for group at the same time as shooting for velocity?

[Army-medic]

Aha!

were you shooting for group at the same time as shooting for velocity?

Yes. Do you think the chrono affected harmonics ? It’s only just occurred to me.

[bullbarrel]

Yes. Do you think the chrono affected harmonics ? It’s only just occurred to me.

If its attached to the barrel then will have some. But if it was that bad I'm sure there would be warnings about it.

[loiner1965]

If its attached to the barrel then will have some. But if it was that bad I'm sure there would be warnings about it.

it will have an effect but only shooting with it on / off will determine how much

[Randy Bohannon]

Yes. Do you think the chrono affected harmonics ? It’s only just occurred to me.

Anything hanging off the barrel will affect the harmonics, for better or worse.

several companies make barrel tuners which screw in and out to “tune” group sizes.

i tried a magnetospeed and found it made groups open up on two of my rifles.

given that introducing unquantifiable variables is an anathema to good reloading practice, I err on the side of caution and use a conventional chrono.

did you shoot the factory ammo with the magnetospeed on the harrel?

[Army-medic]

Anything hanging off the barrel will affect the harmonics, for better or worse.

several companies make barrel tuners which screw in and out to “tune” group sizes.

i tried a magnetospeed and found it made groups open up on two of my rifles.

given that introducing unquantifiable variables is an anathema to good reloading practice, I err on the side of caution and use a conventional chrono.

did you shoot the factory ammo with the magnetospeed on the harrel?

Factory ammo was pre-magnetospeed.

What I have concluded is that what I thought was an optimum load, probably isnt. I chronographed to see why some of the groups were poor after sticking to what I believed was a good load. I assumed it would be related to inconsistent velocities etc. It does not seem that way.

I’m going to look at the load again and once decided upon a reliable OCW I will stick with it and just use the chrono to fine tune the load without making too much of a fuss about exact group size. Once I have chosen the load with a good velocity, low SD and ES I will check the final result without anything else added to the barrel.

I think I may have made a bad call at the first stage and have struggled since. A morning at Bisley should resolve this once and for all!