Hornady Superformance flattened primers

[Irishyorkie]

Good afternoon, its been a while since I was on here but have a query someone may be able to help with.

I tried some Hornaday Superformance gmx 130 grain in .270win and noticed that the primers are flattened in all the cases, they shot and grouped well, didn't feel any different, no sticky bolt indicating pressure signs. I know they are marketed as a beefed up round.

Has anyone else experienced this with Hornady or indeed flattened primers in factory loaded bullets?

many thanks.

 

[NullMac]

That's what we want, flattened but not blown

 

[Irishyorkie]

Thanks NullMac.

Ive attached picture for reference.

 

[finnbear270]

They cool!, no worries.

 

[scrumbag]

I had same with the 257 Roberts version.

 

[25 Sharps]

They cool!, no worries.

Thanks NullMac.

Ive attached picture for reference.
View attachment 271593

They’re hot, or soft primers. You have to decide which.

 

[Irishyorkie]

Hard to tell, thats the only pressure sign. they do market them as increased velocity ect. so they will no doubt be a hotter load.

May just avoid rest of box, just switched to a .270 from 6.5x55. I'm using some factory until I find a copper bullet that I Iike and build some brass reserves ,then will load.

 

[25 Sharps]

Hard to tell, thats the only pressure sign. they do market them as increased velocity ect. so they will no doubt be a hotter load.

May just avoid rest of box, just switched to a .270 from 6.5x55. I'm using some factory until I find a copper bullet that I Iike and build some brass reserves ,then will load.

I’d there is an absolute absence of other pressure signs then may just be softer primers used. No such thing as a free lunch though so higher velocity is usually linked to higher pressure.

That said .270 is rated to higher pressure (62.3 kpsi) than a lot of other stalking cartridges.

 

[User00040]

Try cleaning the barrel/bore.

 

[Irishyorkie]

I’d there is an absolute absence of other pressure signs then may just be softer primers used. No such thing as a free lunch though so higher velocity is usually linked to higher pressure.

That said .270 is rated to higher pressure (62.3 kpsi) than a lot of other stalking cartridges.

very true 25 sharps, to be honest the . 270 seems to push most factory ammunition to a decent velocity, not sure why it needs Superformance haha.

 

[Irishyorkie]

shot through rifle post running in with cheap ammo and deep clean. it is a new rifle but doubt that would have an impact.

 

[C h r i s]

Deprime and see if new primers are a slack fit. Assuming you have dies etc. If slack then assume overpressure.....

At least the headstamp is not obliterated.

 

[long_range_rob]

I’ve been using Superformance in the 25-06. It’s pokey but works well.

 

[Foxyboy43]

“no sticky bolt indicating pressure signs.”
As per above posts - this, plus no extractor “smiley faces” or bolt wipe marks all indicate the round is fine. That said if your confidence with the round is in any doubt it may well bring flinch in it’s wake so you may wish to finish the box and then change ammo.
Good luck.

 

[finnbear270]

Look fine to me, but If you have doubts, don't finish them up.

 

[Irishyorkie]

thanks for the thoughts guys. Im confident that theres no other signs, it just running hot. I'm just working through a few boxes of factory copper so its not the end of the world.

 

[Utectok]

Thanks NullMac.

Ive attached picture for reference.
View attachment 271593

Looks acceptable to me

 

[Smellydog]

If I had reloaded those cases the primers would be flatter!

 

[Jelen]

Superformance gmx in my friends 6.5PRC did the same. It also made the primer pockets loose after 1 firing.
Out of interest I pulled one bullet to weigh the powder, except I couldn't pour the powder out. It was a solid lump which required breaking up and teasing out with a wooden skewer.

 

[User00040]

If I had reloaded those cases the primers would be flatter!

Do you carry a hammer around to open your bolt, or just use a handy rock?