Gents,
On analysing the MV of a 20 shot string, how much deviation would you expect between shots.
What would be an acceptable tolerance of the batch before you would question your reloading technique.
Cheers Aye
I like to get a good load myself. (see 18" 308 loads thread) But to be honest if 3 or 5 bullets hit a group under a inch I'm happy. Nothing wrong with all this science etc and great if you enjoy it. I much rather go stalk a deer though. Even better if I manage to shoot one. Happy loading.
Hi Tackleberry,If you want to be scientific about it then plot each batch on a graph. The spread on the vertical and the powder measure on the horizontal. If you record at sensible intervals you will get a sine wave with each 'sweet' spot visible.
Hi Tackleberry,
Don't know much about the reloading game yet, your quote is interesting.
Does the sweet spot location on the sine wave vary from barrel to barrel and calibre?
Gents,
On analysing the MV of a 20 shot string, how much deviation would you expect between shots.
What would be an acceptable tolerance of the batch before you would question your reloading technique.
Cheers Aye
Hi TackleberryIt's going to be a peak or a trough depending on which way you have plotted the extreme spread on the axis.
Hi JCSI'm looking for a Standard Deviation of 10 fps or less. Sometimes I'm achieving this, but more often I'm not. I've observed that my clean cold bore shot is consistently slower than subsequent shots. This isn't an issue at stalking ranges, but is an issue on paper at longer ranges. You need to form a view on what your clean cold bore shot does.
This article is an interesting read - The Rifleman's Journal: Ballistics: Statistics for Rifle Shooters
A good chronograph is essential - March Scopes MagnetoSpeed Chronograph I wasted a lot of time last year before I got this gadget from Gary.
Regards
JCS