270 win SD climbing

[Allen Roberts]

My sd numbers have gone up after every reload. Same H4350 charge, Petersen brass, cci large rifle primers. Annealed, cleaned, trimmed. Barnes 130 ttsx bullets. Same Oal. Someone said it was neck tension. Any suggestions?

 

[a-dog]

How many rounds on the barrel? I've noticed this is a key indicator when a barrel gets worn out. I would also borescope the barrel and make sure it's actually clean without a carbon ring.

 

[long40shot]

I have a nice 270 krieger blank in the classifieds

 

[ELR LVR]

My sd numbers have gone up after every reload. Same H4350 charge, Petersen brass, cci large rifle primers. Annealed, cleaned, trimmed. Barnes 130 ttsx bullets. Same Oal. Someone said it was neck tension. Any suggestions?

Size your brass
turn your brass necks for a cleanup pass
Anneal your brass necks
Size again to ensure necks are straight
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At least anneal your brass

 

[Allen Roberts]

Size your brass
turn your brass necks for a cleanup pass
Anneal your brass necks
Size again to ensure necks are straight
---
At least anneal your brass

I do anneal. Is there a die to turn the neck or straighten? I’II look into it.

 

[SeabeeKen]

You may be causing the problem by cleaning the carbon from inside the necks. Clean necks cause variations in ES. Either leave the carbon in the necks or use a dry lube inside the clean necks. I use neolube 2 inside my necks to prevent bullet weld during long term storage of hunting ammo and also in my match ammo for consistent bullet release. I use a small foam swab to apply it inside case necks.
A bore scope will help monitor the condition of your bore also. A good investment.

 

[Straightshooter1]

I do anneal. Is there a die to turn the neck

Neck Turning Equipment - Neck Turning Tools - PMA Tool

www.pmatool.com

or straighten? I’II look into it.

Necks should be plenty "straight" after fire forming. . . .at least until they're put through a sizing die. Often, the sizing process will make them less straight.

 

[Doom]

Care to share your chronograph data? Mean, SD, # of samples?

 

[Thud]

Have you changed lot numbers of powder

 

[ELR LVR]

I do anneal. Is there a die to turn the neck or straighten? I’II look into it.

No die used to cut "Turn" the necks
I use a Forster neck turning machine - its like a mini lathe
Other use things like a K&M hand turner, or whats called a Pumpkin brand handheld turner
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I like using my cordless drill which is why I use the Forster setup -Plenty accurate
Plus it does other operation such as brass trimming, inside nbeck reaming etc.
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As far as ensuring your necks are straight I happen to like the Hornady teardrop shaped expanders
other use long mandrels for expaning the neck to size which also straighten out the neck.
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Pictured is what the Hornady expander looks like.
Also a pic of a Forster machine with all the Neck OD attachments
its nice because it has a Helical Knob guide you turn by hand to progress your cut into the neck
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Outside neck turning the brass helps ensure the thickness is the same all the way around for an even bullet release from one shot to the next.
as well as the same thickness from case to case

 

[JFrank]

I do anneal. Is there a die to turn the neck or straighten? I’II look into it.

Personally I would take ten cases and “stop” annealing for at least a few cycles and compare those to the data you have now.