Incepient case head seperation after 3 loads.

[Mtstalker]

If it is oversized 2hat are my options?

 

[Mtstalker]

Yes they were the same. I decapped without sizing to measure.

 

[Ggmac]

That depends on if it's a hunting rifle or other . If its larger by a few thou I would contact the Manufact . Is it a browning Mauser ? They had fairly large chambers .
I would measure your brass unfired , new , if you have any . I would do as Boyd says then neck size after your first fireform . This would keep the bulge and not allow it to grow as fast as it has . BUT you will still get far fewer reloads from the brass .

 

[Mtstalker]

The bulge is on extractor side of bolt. The bulge measures .469" and the body at the shoulder juction measures .442"

 

[dedogs]

Oh the dies are brand new only used with this rifle

Did you clean all the crap out of them (rust inhibitors) with brake cleaner before using? If yes, then I'm stumped. Maybe Boyd will chime back in with some other thoughts-- he's been doing this stuff for a long time.dedogs

 

[Mtstalker]

Its my hunting rifle a browning A bolt 2 medallion with a 26" barrel.

 

[Mtstalker]

I did clean the dies with brakekleen

 

[dedogs]

I would measure your brass unfired , new , if you have any

He's already done that--read his posts. dedogs

 

[Ggmac]

Check your dies ! Resize a few as you normally would and measure the diam near where the bulge was and check its shoulder length against a fired case

 

[alb]

Did you purchase the rifle new or used?

 

[ab_bentley]

Rcbs dies,shellholder and press. Fl sized with .001 shoulder bump. Imperial sizing wax is used. I checked and the die is sizing body to sammi spec. Between fired and resized the body below the shoulder is .002" smaller after resized same with right above the web. The ridge does get slightly smaller after resizing. But it does become more prenounced after firing. Cases are trimmed to spec. No signs of pressure and the weird thing is that this rifle is rhe most accurate one i own.

Do you still have the expander ball in the die?

Adam

 

[Ggmac]

not what I meant Dedogs , I mean measure new brass if he had any remaining if not measure his resized , which he's done .
My message says measure you new , unfired brass if you have any . If he's posted that then I'm sorry , I didn't see it .

 

[Milo 2.0]

I would contact Browning. From the pictures it looks like your chamber is too large or maybe out of round. Your full length sizing setup and procedure looks sound.

^^^^Take this guys advice before you get hurt.

 

[Ggmac]

You bulge is on the extractor side , did you put a reference Mark on the case before firing ? Is it possible the case rotated while extracting or possibly the extractor is putting pressure on the case .

 

[Mtstalker]

New infired brass measured in the same spots are .435 at the body/ shoulder juction and .462 above the web. Fired are .442 and .469

 

[Mtstalker]

I can see where the scratches are from the case being ejected. Could the dies be crooked. I am going to call Browning.

 

[Mtstalker]

According to this im spot on for chamber size. https://www.google.com/search?q=270...AUIBygB&biw=360&bih=560#imgrc=7BXR_rRGM3670M:

 

[6MMsteve]

somebody you know have a borescope? have them take a look

 

[AckleymanII]

Ok, Japan uses CIP standard(European-Metric) which will cut chambers a tad larger than American SAAMI standards. The Winchester brass runs small in dia, with as much as .003- .005 expansion upon firing which is what you are seeing.

You can help your situation by going with European brass which would be, Norma, Lapua '06 brass and neck it down, or use PPU 270 brass, both of which will run MUCH larger in the web than Winchester. PMC is exceptional brass in the 270 if you can find any, tough as nails also. Problem solved.

 

[Ggmac]

Stopp429 I see a lot of prints but all are under the heading case dimensions . Chamber dim are a little larger , if your brass is that small at the web it could be a combination of slightly large chamber with slightly smaller than should be brass .
As a rule , win , fed and rem are usually running .463 to .467 at the .200 line , Lapua runs larger .