Velocity difference?

[Dave M.]

Well, "tits off a fly", very good description, sounds like an ES of 0 fps. WTF!

You (Dave M) and (Doom) seem to have an unnatural obsession with ES and SD. I started this thread talking about neck tension and slight velocity differences with generally informative answers with some good recomendations. Not ES and SD. Typical of any internet forum, you run across the normal and abnormal responses.

Thus, simply fuckoff if you can"t be civil and hopefully help folks who are learning.

^^^^ “…..simply F off if you can’t be civil….” Isn’t that the pot calling the kettle black?? I said over and over the an ES of 8 and SD of 4 is considered exceptional, which is absolutely true. I also said that it is almost statistically impossible to have an ES of 8 and an SD of 4, which is true as well. There are a lot of good people on this site trying to help but you seem like you argue with those that care enough to help you. Post the raw data from the chronograph. I’d love to see how you ended up with anomalous data that amount to the ES and an SD you posted. In the meantime, I’ll just Eff off, lol.

 

[SubVet]

Thanks .....

 

[Doom]

^^^^ “…..simply F off if you can’t be civil….” Isn’t that the pot calling the kettle black?? I said over and over the an ES of 8 and SD of 4 is considered exceptional, which is absolutely true. I also said that it is almost statistically impossible to have an ES of 8 and an SD of 4, which is true as well. There are a lot of good people on this site trying to help but you seem like you argue with those that care enough to help you. Post the raw data from the chronograph. I’d love to see how you ended up with anomalous data that amount to the ES and an SD you posted. In the meantime, I’ll just Eff off, lol.

OP, Ditto the above. I stated that statistically your measured difference did appear to be statistically different in response to another post. I also commented on the issues that can occur when the ES and SD get very low due to instrument inaccuracy that can skew results. You asked about velocity and next tension based on chronograph data. If you took offense to my question about the data, the question was not meant to question anything that you said or posted.

 

[Dave M.]

OP, Ditto the above. I stated that statistically your measured difference did appear to be statistically different in response to another post. I also commented on the issues that can occur when the ES and SD get very low due to instrument inaccuracy that can skew results. You asked about velocity and next tension based on chronograph data. If you took offense to my question about the data, the question was not meant to question anything that you said or posted.

Doom, I thought your response to the OP was MORE than appropriate. I agree the data doesn’t make sense. Some people take offense when they are asking for help and then don’t get the response they are looking for, they get defensive. Keep doing what you are doing. I’m sure others get what we are trying to do. I’m always willing to help those new to the sport. The people in this forum have given me more than I could ever thank them for. There is so much to learn and separating the meaningful from the utter bullshit. Bless everyone on this site for sharing their fantastic knowledge.
Dave.

 

[JFrank]

Who said the OP was new to the sport ?

 

[dellet]

Kind of a simple question, that got muddled by providing un needed information, causing confusion. Add in that some of that information is basically bogus, then much more information is needed to sort it out.

Easy answer is yes, neck tension can change velocity.
A number of groups were shot where the ES/SD numbers were tight enough to see the difference. Averages of 2710 fps and 2730 fps both with an ES of less than 10 fps. In theory the velocities did not overlap, but it might be possible that they do.

The problem is that

The ES (<8) and SD (<4) numbers I quoted were the average of the four groups.

You can't average, averages. It more often than not, gives you a different number, than the average of the total.

You need the ES/SD numbers of all 40 shots. Or 30 and 10, since the load was different. If nothing else the 4 individual sample numbers.

When people see numbers that don't make sense, the challenge flag gets thrown.

 

[Dave M.]

Who said the OP was new to the sport ?

I just assumed he was because he didn’t seem to have an understanding of how extraordinary an ES of 8 and SD of 4 would truly be. Perhaps he isn’t new to the sport.

 

[JFrank]

I just assumed he was because he didn’t seem to have an understanding of how extraordinary an ES of 8 and SD of 4 would truly be. Perhaps he isn’t new to the sport.

I have a shallow understanding of those numbers as well but I can still tune a rifle.

 

[Dave M.]

I have a shallow understanding of those numbers as well but I can still tune a rifle.

But I’m sure you know that if you ripped off 40 shots and got an ES of 8, that would be exceptional.

 

[JFrank]