pressure signs in the .308 Marlin MX ?

Post by **Chuck 100 yd** » Sat Jan 26, 2008 4:44 pm

I found this pic. on Marlin owners and a link to Gunbroker.com .

These cases are said to come from Marlin and were used to test rifles with.
From the looks of the primers,I would say they were ran at very high pressure as in PROOF LOADS??
I have started testing loads in my .308MX and have gotten primers that looked like that with loads 2gr. under Hodgdens maximun data. I used the recomended WLR primers and Hodgdens data from their web site.

What do you guys think? High pressure or what?

A cerrosafe cast shows the chamber and bore to be normal and velocity below what the data states ( as can be expected).
I am going to try CCI 200`s and work up again and see if anything changes.

Post by **Hobie** » Sat Jan 26, 2008 4:47 pm

Well, they aren't FLAT primers, that's what I get in every factory 7-30 Waters round in every 7-30 I've shot.

Leverluver · Post by **Leverluver** » Sat Jan 26, 2008 4:56 pm

Weak firing pin spring and oversized firing pin hole.

Post by **Chuck 100 yd** » Sat Jan 26, 2008 5:45 pm

The primers in the factory .308 LE rounds do flatten. Even more than these and my reloads but they don`t extrude into the firing pin hole.
Ranch Dogs pressure trace equipment shows the factory loads running 46,000 psi.
I am wondering if its the primers giving false readings or the pressure is actually to high.
I have never usedWLR primers in anything over about 40K. psi.
I am going to run some more loads through it in a couple weeks.
I will try CCI 200`s starting low and working up again. Also will try Varget and 4895 from Hodgdens data.
http://data.hodgdon.com/cartridge_load.asp
I dont like the muzzle flash that I got with the 335 and 125gr. loads
BL-C(2) was better but still showing high pressures for the velocity it gave.http://www.levergunscommunity.com/viewtopic.php?t=2719

Marc · Post by **Marc** » Sat Jan 26, 2008 8:11 pm

Weak firing pin spring and oversized firing pin hole.

+1

Post by **Old Savage** » Sat Jan 26, 2008 8:58 pm

I am voting with these boys.

meanc · Post by **meanc** » Sat Jan 26, 2008 9:13 pm

Those flattened primers look like every factory 44mag and 30-06 rounds I've bought. Some of my mid-range reloads in 44mag do the same.

Unless there's a hard/sticky extraction with ammo, I don't really worry about it. I just think it's normal in both rifles and pistols.

Marlin .35 · Post by **Marlin .35** » Sat Jan 26, 2008 9:21 pm

I have seen primers like that in many guns, both rifle and pistol. I would not worry about it!!!! Art

runfiverun · Post by **runfiverun** » Sat Jan 26, 2008 10:39 pm

looks like they are building pressure pretty slowly
plus what levergunner said
the web area looks really good i would like to find a bunch of once fired
that looked like that

runfiverun