Florida Wally
Gold $$ Contributor
I’m working on reducing my vertical spread on the target. Factory Savage .308, 24” barrel, IMR 4064, Peterson brass tumbled in walnut media, CCI 200 lrp, 175 SMK at 2,490 fps average. I lubricate the bullet with graphite when seating and anneal brass each time fired. Using FL body die size and bump .001 to .003 and Lee collet for neck tension. Wilson inline arbor press to seat bullet. For 5 shot groups, I’m getting around a 0.75 moa vertical spread at 300 yards. ES‘s average in the high 20’s low 30’s and SD‘s average in the mid teens. When I do get low ES and SD, vertical reduces to half moa or less. I’m hoping that a consistently lower ES and SD will translate to lower vertical spread. Which of the following variables do you think is/are the most important to reduce ES and SD? I’m trying to figure out what process to more refine next.
1. Powder charge consistency
2. Bullet seating depth consistency
3. Primer
4. Shoulder bump consistency
5. Brass trim length
6. Projectile consistency - bullet sorting
7. Cartridge concentricity
8. Brass volume - sorting
9. Neck tension
10 Neck thickness consistency
11. Other
Thanks in advance!
1. Powder charge consistency
2. Bullet seating depth consistency
3. Primer
4. Shoulder bump consistency
5. Brass trim length
6. Projectile consistency - bullet sorting
7. Cartridge concentricity
8. Brass volume - sorting
9. Neck tension
10 Neck thickness consistency
11. Other
Thanks in advance!
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