I don't know if this a concern on a cartidge this big or not BUT I think I have pressure issues.

The 300 RUM cases had 99 grains of Retumbo with a 180 gr SST in them and look at the primer flow around the firing pin. The cases extracted with no problems and this is the only sign of pressure.

The 7 mag cases had 61.5 grains of H4350 and a 150 SBT in them.

I am halting load development at this time.

Primer flow is a poor indicator of pressure.... most often, it indicates bad firing pin fit to the hole.

The only real exception to this is if you are certain that you are using the exact same primers as the factory loads (and I mean lot and everything; you'd have to pull some bullets from factory loads and reload them with your powder/bullets to be sure).

What kind of velocities are you getting?

I finally got the pictures to load !!!!

I'm using Remington's 9 1/2 M primers. I got the sme result with Federal magnum primers too. I even tried this load in Matt's gun (we both have Remington 700"s) and it does the same thing. Even with factory rounds (180's) there is some primer flow like this.

Velocity? That's my next step. I have to borrow Gunther's Chrony and find out.

The 7mags are running about 2950.

MikeG
The reason I think this might be an issue is I had some .223's do this on a hot day and one finally burnt thru. What a mess!! Good thing I had on shooting glasses!!!

Hmmm. The corners of the RUM primers look fairly well rounded, which would indicate pressure isn't too high. It's hard to tell about the 7mm RM primers. That's not enough to rely on though.

Run your numbers through this online Powley Computer. You'll need chrono data to get a pressure calculation.
http://kwk.us/powley.html

Bye
Jack

You REALLY need a chronograph to know whats going on. Looking at primers, bolt stiffness,etc are surely "indicators" but a chrono is your better tool for the job.

FN in MT











I finally got the pictures to load !!!!

I'm using Remington's 9 1/2 M primers. I got the sme result with Federal magnum primers too. I even tried this load in Matt's gun (we both have Remington 700"s) and it does the same thing. Even with factory rounds (180's) there is some primer flow like this.

Velocity? That's my next step. I have to borrow Gunther's Chrony and find out.

The 7mags are running about 2950.

I agree with Jack, when my pressures started getting high, I've seen the primer edges flatten out. When I work a load up, I ususally place the brass where the loads were so I know the powder charge that was in them. I've seen the primers progressively flatten as I built the load up. From what I see, they don't look too flattened and could be more of a firing pin issue.

Primer flow is a poor indicator of pressure.... most often, it indicates bad firing pin fit to the hole.

The only real exception to this is if you are certain that you are using the exact same primers as the factory loads (and I mean lot and everything; you'd have to pull some bullets from factory loads and reload them with your powder/bullets to be sure).

What kind of velocities are you getting?

I agree poor firing pin fit

I just got home from work. ZZZZZZZZ

I thank all of you for your input. I'm going to get the Chrony and put a couple different loads across it to see what's up.

It's kinda funny that Remington would send one out the door that wasn't put together right don'cha think?!?!?

I may have to give them a little guff if this turns out to be somethng they didn't do right. I did send in the warranty card!!

[QUOTE=recoil junky]I just got home from work. ZZZZZZZZ


It's kinda funny that Remington would send one out the door that wasn't put together right don'cha think?!?!?


No not really a smaller firing pin than the hole it is fitted in-in a massed produced fire arm is more common than you might expect

How tuff would that be to remedy? I was thinking the firing pin spring might be a little on the light side too? What if the pin protruded to far? I can compare it to the 7's bolt/pin assembly I guess.

I'll have to take the bolt apart again and see how "loose" the pin is in the hole. At least w/ a Remington bolt it's east to take apart. I can't figure why Matt's gun would do the same thing tho. If there were any good gunsmiths around here I'd take it to them for a check-up and send Remington the bill.

I was starting to think I'd made too many rude comments about 270's and made some people mad. :)

What you are experiencing is pretty common with older rifles, especially old military ones that have been shot a lot. The firing pin hole in the bolt face enlarges and allows the primer cup to flow back into it. I've got a few that will leave marks resembling moon craters on the otherwise normal primers. As others have said, the nice rounded edges of the cups would indicate your loads are not excessive.

The only cure is to replace the bolt body with a new(er) one or have the gunsmith weld the hole closed and redrill it to proper opening. Probably cheaper to replace bolt and re-headspace.

This rifle is brand new, only been fired 20 times.

Was using the older rifles as examples. Understand that your's is pretty new. Have a gunsmith check out the striker hole for being oversize.

OK, it finally quit raining long enough to get the Chrony set up and here's some numbers for 100 grains of Retumbo and a 180 grain Hornady SST.
3341 fps
3330 fps
3320 fps
in that order. The book says it should be 3400 fps so I'm pretty dang close. Like I said before the primers are the only things showing pressure. So I'm going to have to agree with y'all and say that the firing pin was not fitted correctly at the store.