Thread: What's the Deal?

Not sure what the book speed is but I'd imagine I'm slower than it should be. The day was perfect for the chrony too. Nice clear day 24 degrees or so in the middle of a paddock.

The powder used is ADI 2209 so fairly temp stable.

If it helps my load is
Lapua .260 Brass
140gr A-Max
42gr AR2209
CCI BR primer

22" MAB 1:8 barrel

Originally Posted by Normie

Not sure what the book speed is but I'd imagine I'm slower than it should be. The day was perfect for the chrony too. Nice clear day 24 degrees or so in the middle of a paddock.

The powder used is ADI 2209 so fairly temp stable.

If it helps my load is
Lapua .260 Brass
140gr A-Max
42gr AR2209
CCI BR primer

22" MAB 1:8 barrel

There are many variables I know but I used 46grs 2209 in my .260AI and only got 2820fps thru a 24" barrel with the A max. For the same charge in RL-17 I get 2920ish with the same projectile.

Originally Posted by Normie

Not sure what the book speed is but I'd imagine I'm slower than it should be. The day was perfect for the chrony too. Nice clear day 24 degrees or so in the middle of a paddock.

The powder used is ADI 2209 so fairly temp stable.

If it helps my load is
Lapua .260 Brass
140gr A-Max
42gr AR2209
CCI BR primer

22" MAB 1:8 barrel

Bullets on target don't lie chroro's do. Some of the worst readings Iv had from a shooting chrony have been in full sun. I have a hunch that pointy high bc bullets are harder for the sensors to read accurately as well.

Originally Posted by sneeze

Bullets on target don't lie chroro's do. Some of the worst readings Iv had from a shooting chrony have been in full sun. I have a hunch that pointy high bc bullets are harder for the sensors to read accurately as well.

Too much light is as bad as not enough, alright. Had some ridiculous readings as well.
I haven't tried it but know some people use a vivid to blacken their projectiles so they are easier for the chrony to pick up on bright days. May be worth a go.



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Originally Posted by R93

Too much light is as bad as not enough, alright. Had some ridiculous readings as well.
I haven't tried it but know some people use a vivid to blacken their projectiles so they are easier for the chrony to pick up on bright days. May be worth a go.
Sent from my iPhone using Tapatalk. So please forgive my sausage fingers!!!

Yes might help but you just cant trust the shooting chronys. The sensors are very close together so any error is significant and speed readings will change with the light .As has been said many times you need to validate at range whatever machine you use. The CED II with IR screens is the most reliable at a reasonable price but even that works better in a box that cuts out the sun.

Originally Posted by sneeze

The CED II with IR screens is the most reliable at a reasonable price but even that works better in a box that cuts out the sun.

What do you mean by that mate? I have tested some of mine in the dark. Some times faster than my daylight readings and sometimes slower but not by much, over different strings (Usually within 50fps), using the same load.
I would have thought with the ir screens you would get a more accurate and consistent reading at night? Temp?

Originally Posted by Normie

Not sure what the book speed is but I'd imagine I'm slower than it should be. The day was perfect for the chrony too. Nice clear day 24 degrees or so in the middle of a paddock.

The powder used is ADI 2209 so fairly temp stable.

If it helps my load is
Lapua .260 Brass
140gr A-Max
42gr AR2209
CCI BR primer

22" MAB 1:8 barrel

ADI book speed is 2675 in a 24" the slight lose in speed would be equal to your 22" so your chrony speed is pretty spot on.