Lab radar first shot velocity low?

[Brettmparker1]

I have ran many ladder tests with the lab radar it has worked extremely well for me. Lately I’ve been noticing that the first shot is always 30-60 feet slower than the rest. Has anybody else experienced this or am I just a dipshit that doesn’t have it set up right.

 

[Onewolf42]

Mine does not do that.

Is this artifact just the FIRST shot (cold bore) or first shot of a string?

 

[JustSendit]

Have you noticed this over several rifles/barrels or just one gun? I sometimes have a low MV for my first shot but it’s consistent. Specially with my 6.5 gas gun it’s going to be 30 slower first round than back to normal.

 

[vh20]

Suppressor might cause that too.

 

[Brettmparker1]

Yes first shot of every string and I did have a thought it could be the suppressor. I’ll just chalk it up to normal. It is predictable at least.

 

[Terry Cross]

Yes first shot of every string and I did have a thought it could be the suppressor. I’ll just chalk it up to normal. It is predictable at least.

Definitely not the suppressor.

Question: Is your first shot that clocks slow out of a barrel that you just cleaned?

./

 

[Brettmparker1]

Definitely not the suppressor.

Question: Is your first shot that clocks slow out of a barrel that you just cleaned?

./

No it was the first shot on every new series. I did a ladder of 5 charge weights and every series was the same . First shot is slow. It’s strange I’m going to run it on a couple other rifles to rule out this one.

 

[Terry Cross]

Roger dodger.
Just wondering. 1st shots out of a freshly cleaned barrel are always slow.
Sometimes 60 -70fps slow depending on barrel and cartridge.

If you figure it out, update with the culprit.

./

 

[dgheriani]

Roger dodger.
Just wondering. 1st shots out of a freshly cleaned barrel are always slow.
Sometimes 60 -70fps slow depending on barrel and cartridge.

If you figure it out, update with the culprit.

./

Yeah, my first shot on a clean barrel is almost always slow. Curious to hear what the issue is here, my LR doesn't do this.

 

[Deadfall]

Do you have access to another chronograph to help determine if it's a phenomenon of the rifle or of the chronograph?

 

[Baron23]

I too would be very interested in the final fault determination.

I have no had that sort of issue with my LR but......never say never.

 

[Brettmparker1]

Yah plan is to run it against the magneto speed and with and without suppressor, different rifle I’m hoping it’s just a fluke. this things never been a problem. I’m waiting for a response from LabRadar also.

 

[JustSendit]

No it was the first shot on every new series. I did a ladder of 5 charge weights and every series was the same . First shot is slow. It’s strange I’m going to run it on a couple other rifles to rule out this one.

Ah I read your previous post that you meant the first shot taken, period. If it’s the first shot string after string with a “warm” gun, that is peculiar. Yeah definitely interested in your findings.

 

[Brettmparker1]

Ah I read your previous post that you meant the first shot taken, period. If it’s the first shot string after string with a “warm” gun, that is peculiar. Yeah definitely interested in your findings.

Yah first shot in any condition.

 

[Brettmparker1]

Sorry for the delay.. I do not have an explanation for the cause of what was going on it seems to have fixed itself. The only thing I changed was the bullet weight in the system to what I was shooting. Put the magneto speed on and they were within 5 feet of each other so I’m at a loss for what was going on. But all good now thanks for everyone’s input..

 

[RTH1800]

How does it know when you change strings?

 

[Brettmparker1]

How does it know when you change strings?

I did 4 different series and everything seemed to be working just fine.

 

[bghartm]

I just looked at some of my data from a few weeks ago. My first shot of the day was approximately 50 FPS slower than the rest of the shots. I attributed it to a clean and cold bore. The rest of my shots were all very similar for the string.

 

[Halfnutz]

How many shots per charge weight?
How long between strings/shots?
How does does it do if you switch to an OCW test?

 

[Brettmparker1]

How many shots per charge weight?
How long between strings/shots?
How does does it do if you switch to an OCW test?

I had 5 per weight that day and 10 or so minutes between. The first shot was the issue and it seems to not be one anymore. I guess like I said was the only thing I changed was the bullet weight and I don’t see how that would affect anything as far as velocity.