trying to develop a load for my desert tech ,
16"Barrel,
1in 8 twist
100m pipe range, no environmental effecting bullet, just operator error. Especially group 1 and 3, fighting the bag/rifle. As an indication OCW groups for 44.2gn & 44.3 gn were both 1cm.
OCW appears to be 44.2 gn Vhit N140 pushing a 175gn SMK - working purely from group size comparison between 44.0 & 45.0 gn in 1gn increments. Chronograph was a range supplied Shotmarker system with which there have been issues'
Jump analyses carried out between 10thou and 55 thou off the lands in 5 thou increments, OCW was carried out with a jump of 35 thou. this was chosen to mimic Typical ammunition There appear to be a couple of "good" points but first time I have ever done this so unsure of wether to place greater importance on group size or vertical stringing. Believe that either a jump of 50 or 55 thou (Groups 4 or 5) may be the optimum.
The Group Nos. are the order that I shot them in. The bullet holes down at the bottom right are different barrel and calibre nothing to do with the jump test, (didn't have another target.
These are some of the best groups I've ever shot
, just want to make sure I'm picking the correct Jump.
Appreciate in advance any guidance
Phil
16"Barrel,
1in 8 twist
100m pipe range, no environmental effecting bullet, just operator error. Especially group 1 and 3, fighting the bag/rifle. As an indication OCW groups for 44.2gn & 44.3 gn were both 1cm.
OCW appears to be 44.2 gn Vhit N140 pushing a 175gn SMK - working purely from group size comparison between 44.0 & 45.0 gn in 1gn increments. Chronograph was a range supplied Shotmarker system with which there have been issues'
Jump analyses carried out between 10thou and 55 thou off the lands in 5 thou increments, OCW was carried out with a jump of 35 thou. this was chosen to mimic Typical ammunition There appear to be a couple of "good" points but first time I have ever done this so unsure of wether to place greater importance on group size or vertical stringing. Believe that either a jump of 50 or 55 thou (Groups 4 or 5) may be the optimum.
The Group Nos. are the order that I shot them in. The bullet holes down at the bottom right are different barrel and calibre nothing to do with the jump test, (didn't have another target.
These are some of the best groups I've ever shot
, just want to make sure I'm picking the correct Jump.Appreciate in advance any guidance
Phil
