I have occasionally had a problem of shaving copper off the bullet when I start to seat it. At its worst a fine ring of copper.
A related problem- I feel quite a variance required in pressure to start the bullet base when seating (less common with Norma). What do you all suggest?
Background:
6.5 Creedmoor, ELD-M 140 gr
H-4350, 40.5 gr,
Hornady and Norma cases. Problem mostly with Hornady
Homemade annealing machine, once setup flame and time consistent through the batch run; usually anneal before sizing
FL size- Redding w/ .290 bushing or Forster honed to .290
Neck expand w Sinclair .263 mandrel
Seating with redding die
I am not neck turning (last 72 rounds measured .0005 runout, nothing greater than .001)
On ladder tests with this load, SDs average <8 and ESs <20.
I settled on the bushing and mandrel size as these appeared to be common and thought this would be best for 2 thou neck tension. case neck ID measures .262 before bullet seating. Loaded rounds measure about .292 diameter at the neck. I can try to find a .264 mandrel or slightly flare the mouth (but that then would require three steps to size cases).
On the pressure variance required to start seating I assume that is uneven metallurgy case neck to case neck. I thought moving up to Norma would solve that problem; that has lessened it but not solved. Would Lapua or Nozler (or any other premium brand) solve this problem?
Will appreciate your help and advice, JimB
A related problem- I feel quite a variance required in pressure to start the bullet base when seating (less common with Norma). What do you all suggest?
Background:
6.5 Creedmoor, ELD-M 140 gr
H-4350, 40.5 gr,
Hornady and Norma cases. Problem mostly with Hornady
Homemade annealing machine, once setup flame and time consistent through the batch run; usually anneal before sizing
FL size- Redding w/ .290 bushing or Forster honed to .290
Neck expand w Sinclair .263 mandrel
Seating with redding die
I am not neck turning (last 72 rounds measured .0005 runout, nothing greater than .001)
On ladder tests with this load, SDs average <8 and ESs <20.
I settled on the bushing and mandrel size as these appeared to be common and thought this would be best for 2 thou neck tension. case neck ID measures .262 before bullet seating. Loaded rounds measure about .292 diameter at the neck. I can try to find a .264 mandrel or slightly flare the mouth (but that then would require three steps to size cases).
On the pressure variance required to start seating I assume that is uneven metallurgy case neck to case neck. I thought moving up to Norma would solve that problem; that has lessened it but not solved. Would Lapua or Nozler (or any other premium brand) solve this problem?
Will appreciate your help and advice, JimB