Loose primer pockets

[bowhunter-tw]

Ive never experienced loose primer pockets before, but I think I’m seeing it in 7 rem mag. I didnt see any other signs, primers looked fine, bolt lift normal, could I still be getting pressure signs? Primers went in very easy with bench primer but wont fall out if tapped on table

[Hoss50]

3 hours ago, bowhunter-tw said:

Ive never experienced loose primer pockets before, but I think I’m seeing it in 7 rem mag. I didnt see any other signs, primers looked fine, bolt lift normal, could I still be getting pressure signs? Primers went in very easy with bench primer but wont fall out if tapped on table

How many firings and what brass? On mag cases I get about 4-6 firings before the primer pockets are pretty loose. 

Part of it depends on how hard you are pushing the cases with load pressures. 

[bowhunter-tw]

6 hours ago, Hoss50 said:

How many firings and what brass? On mag cases I get about 4-6 firings before the primer pockets are pretty loose. 

Part of it depends on how hard you are pushing the cases with load pressures. 

This would be second firing if you count factory loading. I was loading 65.3gr of 7828ssc behind an 162gr hornady interlock

[Hoss50]

1 hour ago, bowhunter-tw said:

This would be second firing if you count factory loading. I was loading 65.3gr of 7828ssc behind an 162gr hornady interlock

2nd firing is kind of quick for loose primer pockets unless you have a crazy high pressure load. 

What brand brass? Some are softer than others. 

[bowhunter-tw]

20 minutes ago, Hoss50 said:

2nd firing is kind of quick for loose primer pockets unless you have a crazy high pressure load. 

What brand brass? Some are softer than others. 

Thats what I thought too, max load in the book is 65gr, wouldnt figure .3gr over is really pushing it that much? 
 

Two different Headstamps

“W-W Super”

”R P”

was going to sort out the RP brass and is use it first. Both have looser pockets after second firing. They dont fall out and cannot be pushed in my finger though

[MULEPACKHUNTER]

You could always crimp the pocket prior to loading primer. Light crimp would be easy to achieve by hand. oversized pin in your hand prime tool and giver light press until it tightens up the top of the pocket.

[Hoss50]

1 hour ago, bowhunter-tw said:

Thats what I thought too, max load in the book is 65gr, wouldnt figure .3gr over is really pushing it that much? 
 

Two different Headstamps

“W-W Super”

”R P”

was going to sort out the RP brass and is use it first. Both have looser pockets after second firing. They dont fall out and cannot be pushed in my finger though

I used both of those brands when I was making my own 257 weatherby brass out of 7mm Rem Mag and 264 Win Mag brass. 

4-6 firings was typically all I got before a neck cracked or the primer got too loose. 

I seat my primers with my RCBS press and I will just keep running the brass until it takes almost no pressure from the press arm to seat the primer. When the primer is super easy to set, I mark that case, and after I fire that loading I trash the case. Assuming the primer has at least enough grip to hold itself in. 

[bowhunter-tw]

17 minutes ago, MULEPACKHUNTER said:

You could always crimp the pocket prior to loading primer. Light crimp would be easy to achieve by hand. oversized pin in your hand prime tool and giver light press until it tightens up the top of the pocket.

Where do you get an oversized pin? Ive got a lee bench primer, and an older lee hand primer I could designate to primer crimping.

 

but even if I fix these should I back off on load if this is an indication of pressure? Im getting 3120fps out of a 24” barrel, which is a bit faster than the book estimates, that might also be an indication pressure is spiking in my particular chamber? 

[Ernesto C]

Have you tried one of this? ...

https://www.brownells.com/reloading/measuring-tools/case-length-gauges/swage-gage-primer-pocket-gauge/

Ernesto C.

 

[bowhunter-tw]

6 minutes ago, Ernesto C said:

Have you tried one of this? ...

https://www.brownells.com/reloading/measuring-tools/case-length-gauges/swage-gage-primer-pocket-gauge/

Ernesto C.

 

I have not, that looks like a gauge though rather than a swaging tool

[Ernesto C]

2 minutes ago, bowhunter-tw said:

I have not, that looks like a gauge though rather than a swaging tool

Correct, or use it to check your primer pocket before loading your rounds to see if they are loose. I learned this from Davidinthesun he's a very nice fellow coueswhitetail member with lots of reloading experience.

[bowhunter-tw]

2 minutes ago, Ernesto C said:

Correct, or use it to check your primer pocket before loading your rounds to see if they are loose. I learned this from Davidinthesun he's a very nice fellow coueswhitetail member with lots of reloading experience.

Oh I gotcha, yah I probably should get one to check them

[Ernesto C]

Don't forget that using different brands of brass may cause more pressure in some. Some brass brands are thicker then others. Maybe, using the brands you are using but do a test..reduce your powder charge, try get them on the 3000 fps and compare point of impact between the 2 brands of brass you are using?

You may experience also different velocities from one brand to other (because of pressure cause by brass thickness) Stick to one brand and when you ran out of those then use the other brand but verify point of impact and velocity.

Ernesto C

[PRDATR]

I never cared for 7828, thought it was too slow. Back off a little and keep it around 3000, that extra speed is negligble when it comes to bullet performance. I got better results with RL19.

[bowhunter-tw]

29 minutes ago, PRDATR said:

I never cared for 7828, thought it was too slow. Back off a little and keep it around 3000, that extra speed is negligble when it comes to bullet performance. I got better results with RL19.

I had RL19 but havent found anymore of it or else id be using that