es/sd standards

[JFrank]

People have pretty much proven that too large an ES/SD at long range will give a larger vertical than horizontal assuming either no wind or world class wind reading skills.

Yet this is true.

And at 1000 yards the accepted norm is less. That said, we can screw it up with poor rifle handling, poor wind reading..........that part's easy enough.

I would agree with this ^^, I certainly don’t get into single digit ES with every load although I have seen a few in the 20 ‘s that still shoot well, teens are probably closer to the norm for myself. Does the translate to single digit SD ? IDK

 

[denton]

I would agree with this ^^, I certainly don’t get into single digit ES with every load although I have seen a few in the 20 ‘s that still shoot well, teens are probably closer to the norm for myself. Does the translate to single digit SD ? IDK

"ES", or more properly, range, can be converted to standard deviation. The conversion constant depends on the number of shots in the group.

Number of shots................divide range by this to get standard deviation

........2.................................................1.128
........3.................................................1.693
........4.................................................2.059
........5.................................................2.326
........6.................................................2.534
........7.................................................2.704

The calculation of SD is an estimate based on a sample, so it isn't exact. Neither is the SD calculated from range. So don't expect exactly the same answer from both methods.

Hope that helps.

 

[MEHavey]

It’s called positive compensation....

...spelled m - a - g - i - c

 

[Soonerpesek]

...spelled m - a - g - i - c

How do you do all that different stuff with your text…?

I struggle to go from upper to lower case ….

 

[GeoDudeFlorida]

How do you do all that different stuff with your text…?

I struggle to go from upper to lower case ….

It’s like the documentation for building a Linux kernel -
Step 1: download build scripts
Step 2: run compile
Step 3: magic happens
Step 4: high-five!

 

[Soonerpesek]

It’s like the documentation for building a Linux kernel -
Step 1: download build scripts
Step 2: run compile
Step 3: magic happens
Step 4: high-five!

I understood #’s 3 and 4….

The rest is Charlie Brown’s teacher again…!!

 

[Varminterror]

Old shooting lore says the SMLE No.1 Rifles were considerably more accurate at long range (800m) with the bayonets mounted. The explanation is counterintuitive but the effect has been demonstrated.

Litz latest volume describes an observed, empirical correlation between shrinking group size and increasing muzzle weight.

Multiple theories have been presented, but ultimately, even the most simple physics agrees it should happen - always nice when all signs point the same direction.

 

[R Reed]

Litz latest volume describes an observed, empirical correlation between shrinking group size and increasing muzzle weight.

Multiple theories have been presented, but ultimately, even the most simple physics agrees it should happen - always nice when all signs point the same direction.

Makes me think of the old swamped barrels on muzzle loaders. Kind of a reverse taper getting thicker at the muzzle. Said it made it swing smoother when taking shots on moving game if I remember right.