Originally Posted by Varmint Hunter
I'm working with a new .223 Rem with 23" Broughton 5C bbl (12 twist). I am using Lapua brass, Federal 205M primers and 5 different powders with 3 different bullets, 52 Berger, 52 A-Max & 55 V-Max. It seems that whatever I do I seem to get SD's anywhere from 20-40, which reflects some extreme spreads of over 100 ft/sec with 5 shot groups. The only thing I haven't tried was loading bullets into the lands which I prefer not to do with this rifle.
For whatever it's worth, I'm using Redding S FL dies and moving the shoulders back about .002"
Anyone have any idea what could be causing this problem?
Both my .308 and 300 RUM have SD's in the single digits almost every time I fire a group, but this .223 has got me baffled. Accuracy is OK but not exciting.
In my experience the very small/light bullets are harder to get single digit SDs but it's possible.
Normally the reason for poor SDs is inconsistent combustion.
Some of the causes = Inconsistent; neck tension,volume of case,bullet seating depth,wrong
powder and primer combination.
My best guess would be the primer. You need to try a different one and see if the problem improves or worsens.(Nothing wrong with the primer you are using it just may not be the one
your loads like.
Next = I would not bump the shoulders unless they are hard to chamber.(When the firing pin
strikes the primer if the round moves to much it will cause inconsistent primer strikes and thus
the third thing would be bullet seating .It normally effects accuracy more but with the vld's
it is important to seat closer to the lands (5 to 15 thousandths) than with the standard ojive
I would work on changing only one thing at a time to find the culprit.
Just a few things to try.
J E CUSTOM