Blown primers on New Hornady 6.5 Creedmoor brass HELP

[HardrockZ28]

Lost and don’t know what is going on.
This is a new batch of Hornady Creedmoor brass. New brass as I opened the sealed package.

What I did after opening the package was Inspect all the brass, cleaned the flash holes, Neck sized the brass, Installed Primers, loaded powder and press in the ELD’s.

This is my stander load for the Savage 6.5 Creedmoor, Reloader 17, 41.15, CCI 200 primer OAL is 2.800, Hornady 140 ELD-M, Temp was at 94 degrees.

So I started out shooting my 3 Foaling shots, 3rd shot brass same load, same powder lot and same primer lot, all good and no problems with the brass> I loaded the new brass and the 3ed shot brass all together, did not mix up the brass I know that. As I am very anal when I comes to loading.

I then waited for the barrel to cool down and then shot my next group, I then notice black rings around two primers.
Then shot 9 more with no problems 3 at a time with about 10 minutes cool down time in-between, on shot 10 the black ring showed up again, thinking to myself what the Beep. After another cool down I started on my next group.
First shot was fine all looked good. And then all when to hell, two primer blow out but bolt lift was not bad when I removed the brass. And it happen two more times. So I then grabbed my other box of 3 shot Hornay brass some load (Everything) as I loaded this brass the same time I loaded the new brass. At NO time were the cases in sun, I always keep my cases in the shade with a fan blowing over them and me. It’s Houston Texas in Aug and 100 degrees days is the norm around here.
Why would new brass blow out primers? All primers felt good going in and this is my go to load, I shot this load every weekend. The old 3 shot brass did fine and looks good for another reloading.

Relader17 by the Hornady book is MAX 42.0 and I’m well under that. And the ones that blow out the primers, new primer just fall in the primer pocket. And the primers that blow out do not show any signs of problems as all still have the nice dome on them.
I’m not sure what’s the problem is or did I just get a bad batch of brass? Now I have 25 cases all loaded that I don’t want to shot or trust.

 

[Sniper338]

Rl 17 is HOT, you got MAJOR pressure issues. Just look at the flat primers on the rest!!!! Your way above safe pressure, you should have stopped sooner. You have to use another powder!!!!!

It doesnt matter what the book says! Attention to detail sir. Books are a reference, not an exact!! Theres no way for s book to say safety margins correctly. Start low and work up is always said here on this forum. Every shot needs examined when working up loads!!

Even though you shot some, let me barrel cool, its still heating up more in the barrel, plenty enough to make that happen

 

[Sniper338]

What works in one gun doesnt in another!!

 

[dedogs]

I agree, it looks like a pressure problem. Bottom left of lower picture shows ejector mark as do some of the others if you look close enough. Flattened primers + ejector marks = PRESSURE! What else besides new brass is different (new)? New lot of powder, new batch of primers, etc.? dedogs P.S. I wouldn't shoot the other 25 either.

 

[230grRN]

First of all you're making the assumption that the new cases are the same as the old cases. Hornady is a manufacturer and their main goal is to put product in your hands and not have shortages in the market, what this means is they have muliple presses turning out brass for any given caliber at any given time. What does this mean? Well your cases may look the same on the outside, but the they may be very different on the inside.

The brass is virigin and has never been fired in your gun so your already have less case volume to start with and the very real possiblity the case volume is much lower than you 3x times fired stuff to begin with. I'd start by measuring the volume of the new compared to the old.

Also Re17 is a known powder for going over pressure pretty quickly combine that with the high temps and there's another problem, and if you allowed any of the rounds to cook in the chamber for several seconds this can add to the condition.

Best to be safe, just pull your loaded rds and start over.

 

[czim]

Have you by chance weighed the new brass to see if it is heavier than the older brass that you have? I also use RL17 for my Creedmoor with CCI BR2 primers. My go to is 40.5 but went as high as 42.5, was just more accurate a bit slower. I am in S. Florida so also see the heat like you do. This weekends shoot was about 94 degrees out and had no issues with pressure.

 

[DeadEyeDick45]

I had a similar experience with over pressure signs; flattened primers, ect. I shot six and knew a problem existed. Since I hadn't loaded all the new brass I measured 10 of the remaining cases and found that the brass was sized badly at the factory. Shoulder was 1.455", about where the 6.5 Grendel is supposed to be. I didn't mess with the brass, I "recycled" it and bought some new which is correctly sized. Sent a email to Hornady but never got a reply.

 

[Riesel]

A lot of good advice here ^^^^^^ New brass is a change in the formula and any time spent in the chamber of a hot barrel is going to run that pressure
up. That barrel might feel just warm on the outside but could be very warm in the chamber. I was popping primers in a new build and slowed it way down and use my barrel cooling device to help. South Texas, 99 degrees in the shade. Might just designate it a winter load

 

[HardrockZ28]

Tonight I will pull down the other 25 rounds and measure the case volume with my other Hornady brass and measure all the brass and report back on my findings.
This is not the first time that I have started with new brass and used the same power lot and same primer lot and never had this problem before. Started with 10lbs of Reloader 17, only have about 21/2lbs left.
Even the temp is around the same for the last 2 months 88 to 98 average thru out the day.

Well some good news I finally found H4350 this weekend that I have been looking for and pick up 8 lbs. so I will start testing on the Creedmoor.

Thanks for everyone input

 

[Ringostar]

I would also check the headspace of the new cases.

 

[243winxb]

Neck diameter of a loaded round should not be larger then .295"

 

[swampthang]

Tonight I will pull down the other 25 rounds and measure the case volume with my other Hornady brass and measure all the brass and report back on my findings.
This is not the first time that I have started with new brass and used the same power lot and same primer lot and never had this problem before. Started with 10lbs of Reloader 17, only have about 21/2lbs left.
Even the temp is around the same for the last 2 months 88 to 98 average thru out the day.

Well some good news I finally found H4350 this weekend that I have been looking for and pick up 8 lbs. so I will start testing on the Creedmoor.

Thanks for everyone input

My lite gun.is a 6.5 creedmoor I shoot 1000us benchrest, if you want a good load to try I use 42.7gr of h4350 behind a 140berger vld and routinely shoot sub 5" , 5 shot groups in competition.
I seat 0.02 off lands. I love it. Great gun ,easy to tune and great barrell life. I just went over 2400 rounds down my 5r Bartlein and it still shoots listed out for me.

 

[jlow]

Tonight I will pull down the other 25 rounds and measure the case volume with my other Hornady brass and measure all the brass and report back on my findings.
This is not the first time that I have started with new brass and used the same power lot and same primer lot and never had this problem before. Started with 10lbs of Reloader 17, only have about 21/2lbs left.
Even the temp is around the same for the last 2 months 88 to 98 average thru out the day.

Well some good news I finally found H4350 this weekend that I have been looking for and pick up 8 lbs. so I will start testing on the Creedmoor.

Thanks for everyone input

I too am guessing its because 1) you are close to the edge on your load, 2) high temps, and 3) different case weight volume changing your pressure. Hornady brass is not famous for their weigh volume consistency....

 

[Riesel]

Waiting for Lapua

 

[swd]

Waiting for Lapua

Shoot a 6.5x47 and wait no longer

 

[DHuffman]

Or make your own Lapua cases from .308 or do like I did for my latest creedmoor build and make small primer Lapua cases from .308 win Palma cases.

 

[Liven The Dream]

OAL of Brass ? Had a problem similar with a .260. New Remington Brass all kinds of H PSI signs .
Came to find out that New Brass was.012 to long ,No room for blow back.

There was a Wise Man in Northern CA. wrote and tested rounds 24-7. He passed last year.
I had Lunch on the Range with Him one day. A lot of small talk. We got around to powder R-17 came up !
He said " didn't you read the article I wrote about that stuff " No must have missed it. " He replied Best Fertilizer for my Wife's Flowers "
Good Luck

 

[Cuando]

A Savage you say? Under max loads blowing primers?

Headspace.

 

[WyleWD]

Tonight I will pull down the other 25 rounds and measure the case volume with my other Hornady brass and measure all the brass and report back on my findings.
This is not the first time that I have started with new brass and used the same power lot and same primer lot and never had this problem before. Started with 10lbs of Reloader 17, only have about 21/2lbs left.
Even the temp is around the same for the last 2 months 88 to 98 average thru out the day.

Well some good news I finally found H4350 this weekend that I have been looking for and pick up 8 lbs. so I will start testing on the Creedmoor.

Thanks for everyone input

Are you weighing or dropping your powder charges?? WD

 

[Grimstod]

This is one of the biggest problems I have with the design of the Creedmoor. Hornady way over rated the PSI. The cup design of the Creedmoor is the same as the 260 or 308 which are rated for 60,000psi while Harnady gave the Creedmoor a rating of 62,000. Way to hot. It is why Creedmoor brass does not last very long. Lapua did their 6.5x47 right though by making the cup thicker and using small primer.