Virgin Peterson Brass

[41rem]

Was test firing some virgin Peterson brass in a 28 Nosler using a ladder test using these components

Nosler 150 ballistic tip
Reloder 26
Federal 215

Nosler reloading data (current online information)

Starting load
78.0 grains 3202 fps
79.0. 3263
80.0. 3319
81.0. 3355
Maximum load
82.0. 3421

The 81.0 loading have a very slight ejector Mark, the 82.0 gave a more distinct ejector mark. Bolt lift was unchanged thru all 5 rounds

 

[Harvey_NW]

In my experience new brass won't show pressure as quick as fireformed, it's theorized some of the energy is expended by blowing the brass out to the chamber walls. Once formed and bumped minimally, that energy is converted back to propulsion.

In that situation I would probably roll with 80gr to help mitigate trashing brass, and then repeat the pressure ladder to be safe once formed and see if anything changes. I also would love to see pictures of anything you shoot with a 150 NBT going 3,300+fps .

 

[41rem]

Here's the question, is the mark on the maximum load a sure sign of over pressure?

I'd like to continue to develop this particular load but don't want to stress the brass or rifle.

The mark is directly on the 28

 

[41rem]

I also would love to see pictures of anything you shoot with a 150 NBT going 3,300+fps .

It will be an pronghorn when it happens. W


I was hunting NE Montana last October with my trusty 270 WCF and after 1 week of hunting the distance to an unspooked pronghorn was more than the 400 yards I was set up for. Quite a bit more

That began this Nosler Mountain Carbon in 28 Nosler experiment.

 

[Harvey_NW]

Here's the question, is the mark on the maximum load a sure sign of over pressure?

I'd like to continue to develop this particular load but don't want to stress the brass or rifle.

The mark is directly on the 28

IMHO, if you've gone from clean case heads to pronounced ejector on new brass, you're either there or damn close. If you don't want to trash brass or risk a temp swing or moisture causing issues, I'd load and shoot 10 and see how 80gr groups and roll with that to form the rest, but I load conservatively. I don't believe in seating depth and powder charge "tuning" so if 80 shoots, great. If it doesn't, try a different bullet or powder because you're realistically not going to get it to shoot as good as you want by making little changes to the same ammo.

 

[41rem]

Interesting. I had previously developed a load using Nosler 1x fired factory ammo brass with these same components.

I settled on 80.5 grain load with an average velocity of 3250 & SD of 13, accuracy was sub MOA out to 300 yards

I can run that same load in this brass and gain around 70 fps with hopefully more brass life than the Nosler would have provided.

Thanks for the heads up

 

[Jebel]

How long is your barrel?

While the Nosler load data goes up to 82.0g of RL26, the top velocity at max pressure is 3385 from a 26” barrel. I prefer to use the velocity as the better indicator of top pressure, adjusted to your barrel length.

In my loads using Peterson brass, I tend to hit max velocity below the max charge. Likely due to the somewhat thicker, tougher cases. I’ve had good performance from Peterson.

Added: And I expect to get 25-40 fps less velocity using virgin brass until FF.

 

[41rem]

My barrel is 24". Maximum load velocity was 3421.5 off the Xero

 

[SDHNTR]

Interesting. I had previously developed a load using Nosler 1x fired factory ammo brass with these same components.

I settled on 80.5 grain load with an average velocity of 3250 & SD of 13, accuracy was sub MOA out to 300 yards

I can run that same load in this brass and gain around 70 fps with hopefully more brass life than the Nosler would have provided.

Thanks for the heads up

That extra 70 fps is excessive pressure. It’s telling you something, don’t ignore it.

 

[NWBLKTAIL]

i’m using Peterson brass in my 65 PRC, I have never used it in any cartridge. This is my first go around with it. First 50 rounds.

Running what I think is a really modest charge of 52gr of 4831sc with a 130TMK loaded to book. If i am shoot a string moderately fast I will get ejector marks with no bolt lift on shots 4-5. If I shoot real slow no issue. Velocity is like 2680fps with a 22” OEM tikka barrel. Have a hard time thinking I’m on the “edge”

I’ve ran full house loads of H1000 behind 162eldx’s in Hornady brass for 5 firings in 7rem mag and never had any pressure signs even shooting in warmer weather and quick strings.

I’m still learning, but this is what I know so far.