Key to low ES on reloading

[martyj]

Interesting, where does one buy HBN?

To the OP, have you tried Retumbo?

Tubb Precision Blended Boron Nitride Bullet Coating Kit

I tried it just to see how it shoots and never came up with a load that was close to grouping as well as H1000 but plan on giving it another try as soon as I get a few issues with rifle resolved.

 

[eshorebwhntr]

Very true.

The one thing you did not mention is what chronograph you are using and how absolutely 100% confident you are in your chrony numbers on your ES.

I would stretch your load out to the farthest distance you have available and shoot 5 rounds, measure your vertical spread. If you are say dead on in your vertical spread I would say you are either good to go or good to shoot your lying chronograph. I've seen way too many chrony's that should not be used as reliable 100% data. I always let my field test shooting override my chrony data.

+1

end all, be all is what the bullet is doing down range. that's what we care about. if you get out to 6-700 and you truly have an ES of 50fps you'll have a vertical dispersion.

also doubles as a good check on the average reading (traj validation) you're using from the chrony if the group is high/low of your aiming point

 

[BountyHunter]

Three major items will effect ES if the powder load is good.

However, first you have to have an accurate chrono, otherwise you are just wasting your time. I use an Oehler 35P

1. Primers- depending on the powder you may not need a magnum primer. Going to a standard primer is often the cure.

2. Neck tension variance- anneal

3. Use powdered graphite in the necks before seating. You can buy Imperial Dry Neck Lube 1oz Powder. If you use the steel pin case cleaning, this is a must.

4. 21st Centurys hydro seater is a great tool to measure an variance in seating pressure.