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Reloading Techniques For Reloading


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neck tension

 
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Old 08-06-2006, 02:28 AM
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Join Date: Feb 2006
Location: Nottingham, UK
Posts: 261
neck tension

i have been sizing my cases as far down as my die will let me,(redding competition neck die)1 am putting about 3" neck tension on them.if i only neck size 1/2 way down my cases,
how much difference will this make to my groups????
this is in a full custom rifle built by nesika,all but the bedding.
only i did this yesterday and my groups opened up to a inch.

i am starting to think that my rifle has not been bedded properly,as the 4 that have been done are not shooting to what i would call there full potential.we seem to be lacking consistency.one day i will shoot a .3 the next day it will shoot a 1" @ 100y.
so today i think i am going to rip out the bedding and do them both myself.

i put her through the crono yesterday and got

# 1 3270.6
# 2 3300.5
# 3 3300.5
# 4 3308.4
# 5 3320.4
# 6 3297.9
# 7 3299.2
# 8 3305.8
# 9 3309.8

sd: 13.5
cv: 0.4%
mad 8.6 fps
cv 8.3%
av 3301.5 fps
es 49.8 fps

high 3320.4 fps
low 3270.6 fps

270 WSM shooting 135g SMK n165 66.2g temp 72 D/F.Norma brass,minimum SAMMI spec chamber,3thou of expansion on the necks (no neck tern) 26" lilja bbl.
1/2 to 3/4 thou concentricity
[img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img]
thanks
Colin
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