Originally Posted by Firecat
I have read some post here in the past where some of you have achieved incredible ES numbers from your reloads. Some even in the lower single digits. How did you go about lowering your ES until it was even in the high single digits to low double digits? I have a tight group load for my 7mm that has an ES of 26 Fps. I know that at longer ranges it will begin to open up my group. Whereas if I could get that ES lower it would be more consistent at longer ranges.
I work on SDs first and groups later because the SDs are related to powder,primer,case
size and uniformity,bullet weight.
If you get good SDs with this combination then try other type bullets of the same weight
to find out what bullet your barrel likes, and for better groups. then play with bullet seating
depths for the final accuracy potential.
Only change one component at a time or you may miss a great load.
I am allways happy if I get the SDs below 15 on lighter calibers (17 to 6mm)
With the 7mms through the 338s I look for 10 or lower.
Oddly enough the big bores are notorious for SDs below 5 (Because the bullet weight
is normally 350 + grains they are not effected as much by slight differences in combustion
pressures as are the lighter bullets.
In general the lighter the bullet the higher the SDs (Of course there are exceptions in some).
J E CUSTOM