280AI Peterson vs Nosler weight & H20 capacity

Carlos88

Carlos88

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Decided to weigh the brass and compare case capacities. Both cases primed with new primers (same lot).

Nosler:
Case only: 194.1grs
Case & H20 267.5grs
H20: 73.4grs

Peterson:
Case only: 206.0grs
Case & H20: 276.5grs
H20: 70.5grs
<4.1%

Capacity 73.4/70.5=1.041 or <4.1% Peterson

Given the above (I realize it's not apples to apples with different powders) should starting loads be 4.1% less than with Nosler brass? 5%?

Curious as to how you all approach loading with Peterson brass.

Thanks!
 
Thanks for doing this research. I have some Peterson 280ai brass on the way. It looks like I need to start around 2 - 2.5 gn. lower than book values and work my way up to pressure. Seems like a lot to me. Better safe than sorry.
 
I have not done the extensive measurements you graciously provided, but would assume Peterson and ADG are similar. I worked up several test loads of ADG 7RM and never ran into pressure issues. I moved from Nosler to ADG brass and ended up with very similar loads. Now I have a box of Peterson 7RM brass to work up. Probably doesn't make sense to keep changing brass, but availability seems to dictate this more often these days. I may have to be a little more scientific in my approach this time around.
 
Mark37082 said:
I have not done the extensive measurements you graciously provided, but would assume Peterson and ADG are similar. I worked up several test loads of ADG 7RM and never ran into pressure issues. I moved from Nosler to ADG brass and ended up with very similar loads. Now I have a box of Peterson 7RM brass to work up. Probably doesn't make sense to keep changing brass, but availability seems to dictate this more often these days. I may have to be a little more scientific in my approach this time around.
Click to expand...
What I have done in this situation is back off your normal load a few grains load one in the same manner as your previous load primer,bullet seating depth shoot over chrony and keep going up on powder till velocity is close to previous load then try a group and fine tune if needed ,its always worked good for me.
 
JMW67 said:
What I have done in this situation is back off your normal load a few grains load one in the same manner as your previous load primer,bullet seating depth shoot over chrony and keep going up on powder till velocity is close to previous load then try a group and fine tune if needed ,its always worked good for me.
Click to expand...
Yep. That sounds like the way to go. I'm going to try H4350, StaBall 6.5 & IMR4955. Data will be from the Hodgdon website. Shooting 140 TTSX, 145 LRX and going to order some Hammer's after I replenish the "fun gun fund".
 
Peterson has consistently less capacity than nearly all other manufacturers from my experience, however it is very consistent and very tough. ADG seems to be as good but retains a high capacity, usually on the upper end in the chamberings I have used it in.

For the same pressure, you will likely have a lower charge than your Nosler brass, however you won't see pressure signs until a fair amount higher. Start lower as you noted, and check velocity. I usually just work up until I was at the velocity of my previous brass, making sure to be observant for pressure signs, though the Peterson brass will take a fair amount more. I have used Peterson in my .260 AI, a couple .270 Sherman's, a 28 nosler, and two .338 Norma magnums.
 
Carlos88 said:
Decided to weigh the brass and compare case capacities. Both cases primed with new primers (same lot).

Nosler:
Case only: 194.1grs
Case & H20 267.5grs
H20: 73.4grs

Peterson:
Case only: 206.0grs
Case & H20: 276.5grs
H20: 70.5grs
<4.1%

Capacity 73.4/70.5=1.041 or <4.1% Peterson

Given the above (I realize it's not apples to apples with different powders) should starting loads be 4.1% less than with Nosler brass? 5%?

Curious as to how you all approach loading with Peterson brass.

Thanks!
Click to expand...
WOW what a difference. what scale are you using?
 
The way I solve differences that particular brass makes with a load is in Quick Load.

Just enter the new h20 volume and tune the charge weight to equal the same velocity and pressure you had with the first H20 volume.

Pretty quick, pretty easy, pretty precise if your using the same lot of powder.
 
I have not purchased QL yet. I've heard great things about it, but no longer have compatible PC's or laptops. It is hard to believe they don't offer MAC compatible versions.
 

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