Pressure signs

Reloading info for the 5.7x28mm

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ryan77724
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Pressure signs

Post by ryan77724 » 02 Jun 2020, 08:41

i'm having problems loading for my 5.7, i got my load data for true blue from loaddata.com for a 35gr bullet, and every single powder load is cratering the primers, and starting to flatten them a little. i'm not crimping yet, and i'm using 36gr varmint grenades set to an oal of 1.594", using cci small rifle primers. any suggestions would be greatly appreciated.

ryan77724
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Joined: 27 Mar 2019, 17:56

Re: Pressure signs

Post by ryan77724 » 02 Jun 2020, 08:43

my powder charges start at 5.7 and go to 6.2gr increasing by .1gr for each different group

Buffman
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Re: Pressure signs

Post by Buffman » 02 Jun 2020, 19:42

post a picture of them. What velocity are you getting?

ryan77724
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Re: Pressure signs

Post by ryan77724 » 04 Jun 2020, 07:33

i don't have any pictures right now, i'll post some in a couple weeks when i'm home. and i wasn't using my chrony when i shot the test loads, i'll try to get data next time i'm home

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panzermk2
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Re: Pressure signs

Post by panzermk2 » 19 Jun 2020, 09:55

For starters primer pressure signs mean absolutely NOTHING with the 5.7x28mm. They mean that also for standard caliber often also but the myths are strong.

The 5.7 is a high pressure delayed blowback round. They beat the hell out of the primers. This is why you have to use
small rifle primers for your loads.
Jay Wolf
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