Author Topic: .270 case damage  (Read 546 times)

Labrat198

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.270 case damage
« on: June 30, 2017, 04:05:03 AM »
Any thoughts on what might cause this to happen?

First time reloading my .270 and several of the brass are dinged up. I was on a concrete slab but don't recall seeing them getting banged up just from hitting the ground with the factory loads. Then again I wasn't really inspecting them for pressure signs at that time either.

The_Shadow

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Re: .270 case damage
« Reply #1 on: June 30, 2017, 06:03:30 AM »
This is from a semi auto rifle?  If a semi auto the ejection cycle may be off or the extractor is holding on too long.  May need a good cleaning of the extractor hook and ejector button.

Sometime using slower rifle powders can inhibit smoother extractions, even to the point of ripping the cases apart because the casing is still pressed to the chamber walls when ejection starts.  Had case rims ripped off in a Remington 742, cleaned the chamber and used IMR3031 never had an issue afterwards.
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Labrat198

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Re: .270 case damage
« Reply #2 on: June 30, 2017, 07:07:38 AM »
Semiautomatic is correct.
 
I have to check my notes for the exact number and load, but it was an IMR powder.

From what I have read, a light loading can dirty up the internals pretty quick. I was using the suggested starting point in my lyman manual, so that might have something to do with it.
I plan to give everything a good cleaning and up the charge since I don't have any high pressure signs.

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The_Shadow

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Re: .270 case damage
« Reply #3 on: June 30, 2017, 08:32:10 AM »
If it is a gas piston action you may also need to clean that action as well...
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Labrat198

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Re: .270 case damage
« Reply #4 on: June 30, 2017, 03:49:18 PM »
IMR 4831 at 52.0 grains was the loading

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The_Shadow

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Re: .270 case damage
« Reply #5 on: June 30, 2017, 08:51:16 PM »
4831 maybe a little slow for a semi auto and may have pressure still expanding the casing as the ejection starts...I could be wrong but it is worth investigating...

I have loaded with IMR4831 but only for my Rem 700 bolt action...
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oldman10mm

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Re: .270 case damage
« Reply #6 on: July 01, 2017, 10:13:38 AM »
IMR 4831 is a lot too slow for autoloaders. For the IMR series,3031,4895,4064 are the good mid burnrate ones. Even 4320 might be a tad too slow. 4064 is the popular go-to powder for M14/M1A1 for the 308Win cartridge. Being the 270Win is the necked down 30-06 and that the 30-06 has a few grains more capacity than the 308,I would be trying the 4320 which is 2 steps faster than 4831.
4831 is for magnums,becomes a 'barrel burner'(throat erosion) when used in smaller than magnum cases.
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Labrat198

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Re: .270 case damage
« Reply #7 on: July 02, 2017, 05:56:59 AM »
Ok, good to know.

I went with the IMR-4831 because my Hornady manual said it showed the best uniformity and accuracy and my Lyman had it a touch faster burn than their recommended load (H4831), for the 130 grains I am shooting.

I don't have 3031, 4895, or 4895 listed in either manual, but this should get me going in the right direction.

oldman10mm

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Re: .270 case damage
« Reply #8 on: July 02, 2017, 08:20:06 AM »
http://www.hodgdonreloading.com/data/rifle

click in 270Win,then 130gr,then IMR,many options.
« Last Edit: July 02, 2017, 08:22:05 AM by oldman10mm »
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The_Shadow

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Re: .270 case damage
« Reply #9 on: July 02, 2017, 08:47:58 AM »
Labrat198, this data is from IMR 2001 pamphlet, I suggest you copy to a personal file as I don't know how long Photobucket will allow posting since their new terms of service changed.



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Labrat198

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Re: .270 case damage
« Reply #10 on: July 02, 2017, 09:43:26 AM »
Thanks everyone,  good resources!

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