Primer leakage ?

[Broz]

I reloaded some NEW RWS brass the other night for a friend. This is for the 7mm / 300 win. I sold him. We were switching over to RWS brass from Rem and WW in a attempt to get the load into longer lasting brass. Although we have not seen any problems with prior brass and the load. I just like to use Lapua or RWS were I can.

The load is 77 gr of H-1000 with a 180 Berger .115" off the lands. CCI 250 primer. This rifle has proven to be very accurate with this load.

I advised him to check his 250 yard zero as the brass change could affect velocity. He just called me and said he fired a group at 250 and the elevation was good but he had some horizontal. He also stated that the primers were leaking around the edge. He said all looks good but they all leaked. I asked about bolt lift and signs of pressure and he said they all were good.

I should add this is new brass and we had some runout due to the necking down process. I did square the primer pockets like I do on all brass, and of course I deburred the flash hole. I seated the primers with a RCBS hand primer tool and they all went in nice and tight.

I havent seen the fired brass yet but right now I am at a loss. Anyone seen this before?

Thanks!

Jeff

[gunrac]

If you are talking blowback between the primer an brass, especially new brass, I might consider that a pressure sign.

[Chas1]

I'd stop shooting and go to this link, read pargraph 10.

Primer Myths

[Broz]

Thanks guys. I haven't seen the fired cases yet. He stopped firing and called me as he thought something may be wrong. But he told me there was no cratering going on and the the primers are still seated and didn't appear to be loose. We have fired many rounds through the rifle with this charge and this powder lot. The only change was the brass mfg. From my experience with the 300 win and 210 bullets this is not a over max load by any means. Plus, this is with a 7mm 180 gr bullet, and he didn't experience any gained elevation at his 250 zero. However I will look at the brass later today and I will hand punch out the spent primers to see if they are loose, look it over for any sign of pressure.

I appreciate the replies. I just wanted to see if here was any other know cause other than over pressure.

Thanks!

Jeff

[RockZ]

I had some leakage in my 204 Ruger. I was using FED 205M with no problems and then tried CCI primers.
I was getting alot of leakage around the primer with the CCI's with the same load velocity, and accuracy as the FED 205M so I don't think it was a pressure problem.
Went back to the FED 205M and no problems again.
I just don't think they fit the primer pocket of my brass as well or didn't seal as well.
Just a thought.

[gunrac]

Rule of thumb; I'm sure most have read an even experienced it. Change 1 component, back off your load and work up again.

Good read their, Chas1. Thanks

[Chas1]

Broz, let us know what you find.