powder charge vs velocity

[Mikecr]

Bunch-o-baloney..
While a charge in excess of adequate barrel length get's anyone into diminished returns, there are still returns.

You should explore logical (and real) reasons for your observations.
Probably one or more of Richard's rational list.
I don't know what they are, but it isn't too much powder.

[BML]

Thanks again for all the advice so far. I appreciate it.

[jsthntn247]

Originally Posted by Mikecr

Bunch-o-baloney..
While a charge in excess of adequate barrel length get's anyone into diminished returns, there are still returns.

You should explore logical (and real) reasons for your observations.
Probably one or more of Richard's rational list.
I don't know what they are, but it isn't too much powder.

You say baloney but don't know why it is or have a logical explanation for how to fix the problem yourself?? Hmmm sounds familiar, Obama is that you???

[rscott5028]

Originally Posted by jsthntn247

You say baloney but don't know why it is or have a logical explanation for how to fix the problem yourself?? Hmmm sounds familiar, Obama is that you???

jsthntn247,

None of us know why because we weren't there and had no control over the variables and method of procedure. ...never mind the ability to gather enough samples to be meaningful.

Perhaps someone will explain why more powder results in reduced muzzle velocity rather than diminishing returns?

...unless you're dealing with compressed loads which affects containment and seating depth.

-- richard

[BML]

Originally Posted by rscott5028

jsthntn247,


Perhaps someone will explain why more powder results in reduced muzzle velocity rather than diminishing returns?

-- richard

That's the question I would like to know that answer to! They certainly were not compressed loads. I did a lot of testing with charges in the 48-48.5 grain range and never experienced any big variances in velocity like this.

Once the wind dies down up here I am going to test that same 50.5g and 51.0g again and see if I come up with the same results.

[JackinSD]

Originally Posted by rscott5028

there are many reasons why this can occur...

• statistically insignificant sample size
• variable lighting affecting chrony
• bore condition, clean vs fouled
• barrel temp, ambient temp, ammo temp, powder temp sensitivity
• shooting position and inconsistent hold from shoulder fired weapon
• brass volume consistency
• seating depth

If you can't come up with anything logical, then see if you get repeatable results by alternating shots from each load. If after 30 samples each, the mean of one load is 2x SD apart, then you can have 95% confidence that the MV going forward will be about that much different.

Either way... how did the groups compare? How did POI compare?

-- richard

BML,

Richard has given you a few possibles. I would check them and anything else that may have missed, or that didn't stay constant. Anything as simple as a low battery in the chrony, chrony picking up a muzzle blast or shooting your reloads out of order. There was atleast one thing that was not working right or not constant in your reloads, chrony or methods.

Rule out as many things as possible (read "all) and reshoot to obtain correct data.

[T3-OleMan]

Try the chrony at the end of wire (15' < 20') be sure sun is shaded. Could be you were too close?
Good luck.