DUD Remington 7.5 small rifle bench rest primers

[Nic Swink]

Nothing wrong with the primers you got primer pocket issues. Are you seating them according to feel or depth? You can see the misfired ones are deeper than the fired one

This is my first time reloading I got a buddy that’s been reloading prob over 20 years I’ve been getting my info from him for the most part. I did not uniform the primer pocket. so I guess I need to start pulling

 

[Dusty Stevens]

This is my first time reloading I got a buddy that’s been reloading prob over 20 years I’ve been getting my info from him for the most part. I did not uniform the primer pocket. so I guess I need to start pulling

Did you buy the brass already processed or something? How are you seating the primers-what tool?

 

[Nic Swink]

Did you buy the brass already processed or something? How are you seating the primers-what tool?

Yes there 204 Hornady brass and the primers were seated by a RCBS

 

[SSL]

This is my first time reloading I got a buddy that’s been reloading prob over 20 years I’ve been getting my info from him for the most part. I did not uniform the primer pocket. so I guess I need to start pulling

I'm certainly not trashing your friend, but you also need to get some good books on the basics of reloading and follow them closely. You might want to read up about primer depth while you are at it. Primers should be set firmly against the bottom of the primer pocket. This normally will position the primer just enough below the case rim to prevent "slam fires" or dragging on the bolt. Simply running your finger over a properly seated primer, you should feel a slight depression, not a divot, just enough to feel it. I've been loading for nearly 60 years and the only time I've ever seen primers that far below the case rim was with bad (over cut) primer holes...usually caused by someone 'uniforming" primer pockets with far too much enthusiasm.

 

[Dusty Stevens]

Yes there 204 Hornady brass and the primers were seated by a RCBS

An rcbs what tool? And id carefully measure the depth of those pockets and get hornady to send you some new brass

 

[SSL]

Yes there 204 Hornady brass and the primers were seated by a RCBS

Not trying to be a smartass, but did you use the small ram in your tool? If you used the large ram it would explain the primers seated only flush. The ram would seat the primer, but be stopped by the case head before it seated to the bottom of the primer pocket.

 

[Indianhead15613]

Primer pockets are deep.....do you use an adjustable uniformer ? Set screw may have come loose and cut them too deep ......their definitely deep

 

[jasophil1]

Bad cases primer pocket to deep check with caliper i got some hornady 22 hornet that was bad once .

 

[Nic Swink]

I'm certainly not trashing your friend, but you also need to get some good books on the basics of reloading and follow them closely. You might want to read up about primer depth while you are at it. Primers should be set firmly against the bottom of the primer pocket. This normally will position the primer just enough below the case rim to prevent "slam fires" or dragging on the bolt. Simply running your finger over a properly seated primer, you should feel a slight depression, not a divot, just enough to feel it. I've been loading for nearly 60 years and the only time I've ever seen primers that far below the case rim was with bad (over cut) primer holes...usually caused by someone 'uniforming" primer pockets with far too much enthusiasm.

I’ll take all the info I can get. So the factory brass I still need to uniform the primer pocket? Cause I didn’t touch the primer pocket

 

[Tokay444]

If it’s too deep, making it deeper won’t help.

 

[Nic Swink]

Primer pockets are deep.....do you use an adjustable uniformer ? Set screw may have come loose and cut them too deep ......their definitely deep

I didn’t touch the primer pockets

 

[gravelyctry]

Gotta be bad primers. Send them my way and I’ll get rid of them for you.

 

[SSL]

So the factory brass I still need to uniform the primer pocket?

No, do not deepen them.

 

[Stephen H]

Pull the bullets and see if you maybe forgot to put powder in them

 

[Nic Swink]

I didn’t touch the primer pockets

I just measured a factory primer pocket along side with the casing I orderd and there both Hornady the factory is 0.119 and the cases I orderd new were 0.121 0.120

 

[SSL]

Remington 7 1/2 primers measure a nominal .110" in height. Read here: https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/

 

[JohnKielly]

What did the ones that fired look like?

If the primers had expanded towards the edge of the primer pocket, then there's a liklihood that the chamber is more generous in dimension than the brass can handle. In such instances, the round gets pushed to the front of the chamber, fires and the primer immediately backs out to make contact with the bolt face. Once chamber pressure releases or the brass expands, the case comes back to the bolt face, when the primer "rivets" or expands in diameter.

 

[Nic Swink]

Remington 7 1/2 primers measure a nominal .110" in height. Read here: https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/

Remington 7 1/2 primers measure a nominal .110" in height. Read here: https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/

Thanks for your help I’m gonna read up on how deep the primer needs to be and maybe get a hand primer tool.

 

[Nic Swink]

What did the ones that fired look like?

If the primers had expanded towards the edge of the primer pocket, then there's a liklihood that the chamber is more generous in dimension than the brass can handle. In such instances, the round gets pushed to the front of the chamber, fires and the primer immediately backs out to make contact with the bolt face. Once chamber pressure releases or the brass expands, the case comes back to the bolt face, when the primer "rivets" or expands in diameter.

The normal specs for seating a primerare for them to be at least . 002" below flush, up to . 009" below flush. Too high, and the primer may not go off-too much energy is absorbed in seating the primer deeper
That’s what I have found

 

[RegionRat]

@Nic Swink , I just scanned the thread and may have missed this question/answer, but did the duds ever get disassembled to verify 1) there was actually powder in them and 2) if the primers in fact failed to ignite? Forgive me if I missed it someplace scanning this over too quickly.