6 Dasher inconsistent shoulder bump

[Cuando]

11 firings on Lapua blue box and I’ve been having some inconsistencies with my annealing process I believe. I sold the Bench Source and just got an AMP.

Ran Aztec mode and annealed 97 and bumped shoulders 2 thou. I have three pieces that only bumped a half to 1 thou and I can feel them chamber with the firing pin removed.

I have the cases marked but I’m curious if I should cull them, run them through the AMP and bump again or adjust dies down, bump more and go shoot?

 

[tmwinds]

Try bumping them again. This time hold the press handle at the bottom of the stroke for about 3-4 seconds. Maybe the shoulder will take a set. I do this on all of my brass and it seems to bump more consistently. If that doesn't work try annealing these pieces again.

 

[shoot4fun]

I would say blame it on the Aztec. It cannot “read” the heat necessary to properly anneal individual case. I say “Flame Away”!

 

[Cuando]

It was WAY worse with the Bench Source quite frankly.

 

[shoot4fun]

It was WAY worse with the Bench Source quite frankly.

Hmmm
Anneal after each firing?

 

[Cuando]

Yes.

I could feel 20-25% were not bumped far enough and they'd all be flyers.

 

[JFrank]

Question for you Dasher guys-
is annealing an essential task while forming and maintaining the cases through the brass life?
Just curious
J

 

[Alex Wheeler]

Consistent shoulder bump needs good lube, and applied consistently. I prefer Hornady one shot wax in the silver tin. I have found it to give the most consistent bumps among the lubes I tested. You also need to deal with slop and flex in your press. A solid cam over will fix that. Use Redding competition shell holders. Annealing is the last part, and through my testing at the bench and on target, I always annealed much more than the tempilaq would have you do.

 

[dmoran]

... is annealing an essential task while forming and maintaining the cases through the brass life?

Below is a 2.553" @1000 group shot with Lapua made 6Dasher brass never annealed on there 19th cycle:

 

[Cuando]

Consistent shoulder bump needs good lube, and applied consistently. I prefer Hornady one shot wax in the silver tin. I have found it to give the most consistent bumps among the lubes I tested. You also need to deal with slop and flex in your press. A solid cam over will fix that. Use Redding competition shell holders. Annealing is the last part, and through my testing at the bench and on target, I always annealed much more than the tempilaq would have you do.

I'm very surprised how hot the case head gets in the AMP.

 

[Iowa Fox]

Consistent shoulder bump needs good lube, and applied consistently. I prefer Hornady one shot wax in the silver tin. I have found it to give the most consistent bumps among the lubes I tested. You also need to deal with slop and flex in your press. A solid cam over will fix that. Use Redding competition shell holders. Annealing is the last part, and through my testing at the bench and on target, I always annealed much more than the tempilaq would have you do.

I'm glad to see you mention Lube. When I tell people that they think I'm off my rocker, lube makes a huge difference.

 

[Alex Wheeler]

I'm glad to see you mention Lube. When I tell people that they think I'm off my rocker, lube makes a huge difference.

I am not annealing currently with my BRA but I did with the Dasher and rl15, I have a Benchsource which I like. Never used the amp.

 

[JFrank]

Not a Dasher guy or an annealer so there’s that...
I own three presses none have the same type of linkage. I have a Harrell’s that I consider a true cam over linkage press. Any of these presses bump a shoulder consistently as long as I complete the cycle at a steady not fast a pace. I use a small amount of Unique lube’ at the moment, if a problem arose perhaps I would look around some other’s.