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.270 win. flat primers. high pressure???

 
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Old 06-08-2010, 05:07 PM
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.270 win. flat primers. high pressure???

i have a .270 win. in a stevens modle 200 and so far EVERY load i have shot through it have had flat primers. 2 days ago i went to the store and bought some Federal 150 grain factory bullets to see how they shot and to see if i still was geting flat primers. so i went to the range and fired 10 shots and every single one has flat primers. i know that flat primers can be a sign for high pressure but im wondering if there are any other causes for the flat primers. i am not having this issue with any of my other guns and im wondering if i should just not worry about it
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Old 06-08-2010, 06:19 PM
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Re: .270 win. flat primers. high pressure???

Are they cratered where the firing pin contacts? Did you start at the bottom charge? And also check your seating depth that could cause problems.
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Old 06-08-2010, 06:49 PM
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Re: .270 win. flat primers. high pressure???

Can you post some pics of the factory flattened primers?
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Old 06-09-2010, 07:09 AM
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Re: .270 win. flat primers. high pressure???

Quote:
Originally Posted by padd54 View Post
Can you post some pics of the factory flattened primers?
yea i will do that today when i get home
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Old 06-09-2010, 07:13 AM
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Re: .270 win. flat primers. high pressure???

Quote:
Originally Posted by 7 loader View Post
Are they cratered where the firing pin contacts? Did you start at the bottom charge? And also check your seating depth that could cause problems.
well our seating depth i know is not the problem i have tryed under what my nosler book has set for a standard and i have tryed the exact steating depth every thing i have tryed it has done it im thinking i may have a tight chamber. it is a savage so they have very good actions so that may be what is causing it
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Old 06-09-2010, 11:29 AM
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Re: .270 win. flat primers. high pressure???

It can also be a headspace problem. Most of the new brass that you can buy has about .006 headspace built into it. Neck size some brass that has been fired in that chamber and then reload it and see if you still get a flat primer.
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Old 06-09-2010, 01:20 PM
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Re: .270 win. flat primers. high pressure???

Mr/ Gibbs is almost certainly correct, it's headspace, not pressure.

Headspace is, or should be, a non-issue for reloaders. Simply back the sizer die up until the cartridge actually fits the chamber at the shoulder and you're done. Some call that "partial FL resizing" but it's a poor term, "partial" anything only means incomplete but undefined. I call it "custom resizing", that means it's specifically sized to fit MY rifle correctly.

Or, as Gibbs suggests, do neck sizing.

Last edited by boomtube; 06-09-2010 at 01:24 PM.
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