Neck Sizing .270

Lee Q. Loader · Aug 22, 2019

I neck size only all my .270. Am I going to reach a point after so many loadings where I will have to full length size the brass? Most of my brass has about 4 or 5 loadings on it now and still chambers without any resistance.

troy fairweather · Aug 22, 2019

I do every 3 or 4 firing just bump the shoulder back a few thousands.

JFrank · Aug 22, 2019

Slamfire · Aug 22, 2019

At some point the brass will work harden to the level that the case is a crunch fit to the chamber. And this is when the case will stick in the chamber on extraction.

I have never found any accuracy or function advantage to neck sizing only. To ensure proper sizing, I buy these cartridge headspace gages, this is a Wilson

this is a Sheridan:

and I full length size my cases, but using the gauge to measure how much I am sizing. I bump the shoulder back about 0.003" from the fully expanded,out of the chamber, length. You want clearance between the case and chamber before ignition so the case will retract from the chamber walls after ignition.

Lee Q. Loader · Aug 22, 2019

Slamfire said:
I have never found any accuracy or function advantage to neck sizing only.

I'm not a good enough shot that I could tell the difference. I just neck size because that's the way i was taught by my dad. All the brass I got from my dad was tight when I started reloading about 15 years ago. Being the rookie that I was, I just tossed that brass and bought new Winchester brass. That's what I'm still using now.
Thanks everyone. I'll get a full length sizing die and get to work on my 200 or so cases.

cw308 · Aug 22, 2019

Look into full sizing to .002 headspace with Redding Competition Shellholders . You won't oversize your cases and have better case consistency . Just my opinion .

JFrank · Aug 22, 2019

Slamfire said:
At some point the brass will work harden to the level that the case is a crunch fit to the chamber. And this is when the case will stick in the chamber on extraction.

I have never found any accuracy or function advantage to neck sizing only. To ensure proper sizing, I buy these cartridge headspace gages, this is a Wilson

View attachment 856301

this is a Sheridan:

View attachment 856302

and I full length size my cases, but using the gauge to measure how much I am sizing. I bump the shoulder back about 0.003" from the fully expanded,out of the chamber, length. You want clearance between the case and chamber before ignition so the case will retract from the chamber walls after ignition.

Sheridan is extremely ... cool man

JFrank · Aug 22, 2019

cw308 said:
Look into full sizing to .002 headspace with Redding Competition Shellholders . You won't oversize your cases and have better case consistency . Just my opinion .

Ya know
I have been headspacing a bit more lately on my high pressure stuff (Br) with out any problems, I’m seeing the same accuracy and free chambering.
My 308 is still around.003 but the BR is more like .004
Maybe at the end of this season I’ll have a full report

FLIGHT762 · Aug 23, 2019

troy fairweather said:
I do every 3 or 4 firing just bump the shoulder back a few thousands.

Same here. If I decide to neck size (which isn't very often), I go 3-4 X max. then F/L size. O/P, the first time you have to beat on your bolt handle with a 2X4 to get a stuck case out, you'll figure it out.

Walks · Aug 23, 2019

I've always either Neck-Sized or Partial-Sized.
I think it improves accuracy a bit and will definitely extend case life.
In particular on Rimmed Bottleneck cases. I have had great luck in neck-sizing .303Brit & .30-30, cases last along time.

2ndtimer · Aug 23, 2019

It also depends on how hot your loads are. Maximum pressure is harder on the brass and will require full length sizing sooner to ensure ease of chambering. Milder loads can be neck sized only a number of times and still chamber. For hunting and AR loads, I full length size every time.

cw308 · Aug 23, 2019

I have tried .003 & .004 and found even though you have more room , cases seem to swell more from oversizing causing a harder bolt lift . Sizing to the minimum .001 & 2 it doesn't happen , I can go 25+ reloads , if I see a split at the case mouth I dump the lot . I load 30 of the same cases each week two seasons back and went 25 , then I switched to 3 groups of 30 and rotate each week . Will never get to 25 , I'll dump the 90 cases after my season . Benchrest shooting only with temps above 50 , getting wimpy in my later years I guess .

Neck Sizing .270

Lee Q. Loader

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troy fairweather

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JFrank

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Slamfire

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Lee Q. Loader

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cw308

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JFrank

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JFrank

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FLIGHT762

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Walks

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