7 SAUM load data

[Longtine88]

I am thinking that RL26 may be a better option with the nosler brass, little less bulky. I am thinking the 7 saum with nosler brass will run out of room before it hits pressure.

You can find pressure with RL26 found it around 3,120 fps mark. I found the same as you did with N565 node around 2,930 fps. And it was a very very accurate spot. The RL26 I was having strange velocity jumps. Like I found a node that was accurate and the velocities would be like 3020, 3022, 3028 then one goes 2870 fps.

 

[ridgeline300]

You can find pressure with RL26 found it around 3,120 fps mark. I found the same as you did with N565 node around 2,930 fps. And it was a very very accurate spot. The RL26 I was having strange velocity jumps. Like I found a node that was accurate and the velocities would be like 3020, 3022, 3028 then one goes 2870 fps.

What is your setup? Barrel length / COAL/ Brass. How many grains did it take you to hit 2930?

 

[Longtine88]

Proof 1:9 twist 24" N565 64.7 grains New Norma brass. COAL 3.006"

 

[ridgeline300]

That sounds about right. Are you crunching powder at 64.7 grains?

 

[Longtine88]

What is your setup? Barrel length / COAL/ Brass. How many grains did it take you to hit 2930?

APR 7mm saum 24" Carbon Proof Sendero 1:9 twist
F210M primers & New Norma Brass

You may have been talking about RL26 so let me break them down:
Berger 175 Elite's

RL26
62.0 2961
62.3 2974
62.6 3006
62.9 2973
63.2 3027
63.5 3038
63.8 sticky bolt

N565
63.8 2893
64.1 2910
64.4 2935
64.7 2928 Produced ES 11 SD 6.2 0.28" 4 shot group and several .2's 3 shots
65.5 2950
65.3 2961 Never hit pressure

RL23
60.7 2942
61.0 2965
61.3 2979
61.6 3004 3009 3010 2993 4 shots made .282" group
61.9 2983
62.2 3030 Never hit pressure

And today tried N560 with nice results. Had to stop cause of rain.

N560
62.0 2927
62.3 2976
62.6 2974
62.9 2996
63.2 3000 3004 3010 No pressure hit. Rain. 3 shot 0.31" group

I will finish this ladder later.

Hope that helps.

 

[Longtine88]

That sounds about right. Are you crunching powder at 64.7 grains?

I had to vibrate the kernels down to keep it from crunching the powder on N565. But N560 I was not compressed yet.

 

[ridgeline300]

Thanks for the info. I have a ton of 565 so I think I will be running that in my case. My velocities mirror yours, assuming about 50 FPS less since I have a 22" barrel. I didn't notice any pressure in mine until 67 ish. I think N560 could be great, especially in the shorter chambers like the one I am loading for a friend now.

 

[Longtine88]

Man that powder had to be midways through the neck at 67

 

[ridgeline300]

Man that powder had to be midways through the neck at 67

About 1/4 of the way!

 

[Longtine88]

Went back to the ladder I was playing with on N560.
Norma Brass
F210M Primer
N560 63.0 Grains
.002" neck tension

4 Shots 3,002 2,996 2,994, 2999 ES 8 SD 3.0 0.244" group

I think I'm landing here if my 1000 yd groups hold true.

 

[ridgeline300]

What is the consensus on primers? I have been using 210's but it seems like a lot of people are using magnums.

 

[Buttermilk]

I use F210GMM and WLR in my 7 SAUM.

 

[ridgeline300]

Went back to the ladder I was playing with on N560.
Norma Brass
F210M Primer
N560 63.0 Grains
.002" neck tension

4 Shots 3,002 2,996 2,994, 2999 ES 8 SD 3.0 0.244" group

I think I'm landing here if my 1000 yd groups hold true.

Thanks for all of the good info. Your results with N565 just about mirror mine. I am tempted to try RL26 or 560 but I have 2 8lb jugs of N565 so I think I will make it work. Since the barrel has settled down, it seems 65.5 is on the upper end of pressure so I will likely back down to 63 ish and play with that since I just about have all my brass fired. How far are you jumping your 175's and what is your COAL?

 

[Longtine88]

Jumping the 175's 0.065" to Lands COAL 3.078". FYI I thought I could fix the out of line's velocity swing in the RL 26 with a magnum primer and It didn't work. Got the same results but 10 FPS faster about. The magnum primer's didn't gain me anything in N560 either.