Standard Deviation & Extreme Spread
Posted: 30 Mar 2024 13:57
Mornin'!
Just back from the range after trying out my newbie reloads from my new Pro 4000.
From 2 ten round strings from my Glock 34 firing 147gr Summit City coated .356 bullets.
This over 3.4gr IMR PB with Fed primers.
First 10: SD=10 / ES=26 / Average velocity=916 / Power factor= 134.65
Second 10: SD=8 / ES=23 /Average velocity=902 / Power factor= 132.59
For kicks, I shot a string from my new Ruger Max-9
SD=13 / ES=42 / Average velocity=837 / Power factor= 123.04
So the Max-9 didn't make minor power factor, but I'm not shooting it in competition. Like I said, just for kicks.
Curious for input on those numbers for the G34, my USPSA gun. I know smaller is better, but bearing in mind, this is my first dip into the reloading pool after shooting for many, many years.
Thanks for your comments & suggestions!
Dave
Just back from the range after trying out my newbie reloads from my new Pro 4000.
From 2 ten round strings from my Glock 34 firing 147gr Summit City coated .356 bullets.
This over 3.4gr IMR PB with Fed primers.
First 10: SD=10 / ES=26 / Average velocity=916 / Power factor= 134.65
Second 10: SD=8 / ES=23 /Average velocity=902 / Power factor= 132.59
For kicks, I shot a string from my new Ruger Max-9
SD=13 / ES=42 / Average velocity=837 / Power factor= 123.04
So the Max-9 didn't make minor power factor, but I'm not shooting it in competition. Like I said, just for kicks.
Curious for input on those numbers for the G34, my USPSA gun. I know smaller is better, but bearing in mind, this is my first dip into the reloading pool after shooting for many, many years.
Thanks for your comments & suggestions!
Dave