7 SAUM load data

[Pudgy]

Is that seating depth correct?

It is. I had a small seating node close to the lands. And a wide node .30 wide from .65 to .95 off the lands. There is typically one node close and 1 off the lands. The one farther of isn't always the absolute most accurate, but it's usually far more consistent over the course of a match.

All seat does is "time" the load. Or time the bullets exit from the barrel.
Your want the bullet to exit at the optimal moment when there is reduced harmonics at the muzzle.
I can usually find this timing cycle twice in a seating test.

 

[bergara0256]

Here's my F-class load.
ADG - 180 hybrid- .75 jump - 58 N555 - Fed 210
Bartlien 30" 1:8.4 TW. Chrono 100 shots in strings of 20 in 100 degree weather. ES 25.2 SD 5.5 - 2930 fps

here's a picture of 24 shots from my seating test at 1000 yards. It's a 6.5-inch by 4.6 inch group. Within the group is a 3 shot 2.3 X .85 Inch group that was the .75 jump I ended up using.

Do you change barrels a lot throughout the year? Do you always use the same reamer?

 

[Phil Rizzo]

Wow. I know zero about match setups. Extremely long FB?

 

[Pudgy]

Do you change barrels a lot throughout the year? Do you always use the same reamer?

This was my first year, It was a SAAMI spec reamer (cut by unknown munitions) put on my hunting action (Zermatt arms Bighorn Origin) a used F-class stock (didn't fit me) and a TT diamond trigger. I only used 1 barrel, just retired it with 2,000 rounds on it at the end of my last match at Rattlesnake where I placed 2nd.

I am just finishing 2 custom rifles actually built for f-class and that fit me. I have 4 barrels cut using the same reamer specifically for the 180 hybrid. I am testing the 7RSAUM against the new 7PRCW (6.5 PRC necked up to .284). Whichever I end up sticking with I will use that reamer going forward

 

[bergara0256]

This was my first year, It was a SAAMI spec reamer (cut by unknown munitions) put on my hunting action (Zermatt arms Bighorn Origin) a used F-class stock (didn't fit me) and a TT diamond trigger. I only used 1 barrel, just retired it with 2,000 rounds on it at the end of my last match at Rattlesnake where I placed 2nd.

I am just finishing 2 custom rifles actually built for f-class and that fit me. I have 4 barrels cut using the same reamer specifically for the 180 hybrid. I am testing the 7RSAUM against the new 7PRCW (6.5 PRC necked up to .284). Whichever I end up sticking with I will use that reamer going forward

Keep us up to date on how it all goes! Wishing you the best of luck man!

 

[Pudgy]

Wow. I know zero about match setups. Extremely long FB?

I use .225 free bore. But have used less and haven't had a significant difference in performance as long as I can seat the bearing surface above the neck/shoulder union to avoid any potential donuts

 

[Longtine88]

I use .220 and .200. I've found the same. Seating depths way off lands generally are the most consistent and a very very large node at that.

 

[Huntnpack]

Is that seating depth correct?

Not Likely. Say it isn't so !!

.075 not .75 ?

It is. I had a small seating node close to the lands. And a wide node .30 wide from .65 to .95 off the lands. There is typically one node close and 1 off the lands. The one farther of isn't always the absolute most accurate,

.03, .065, .095. Maybe?

Put the Tape Measure away !!!!
& Back up Slowly.

 

[Pudgy]

Not Likely. Say it isn't so !!

.075 not .75 ?



.03, .065, .095. Maybe?

Put the Tape Measure away !!!!
& Back up Slowly.

that pesky little zero, never there when you need him. .075 is indeed the correct amount or put another way 75/1000
Or 75 thousandths off the lands.

 

[bergara0256]

I saw pressure signs with mild ejector marks at 65.5ish of h1000. Bolt got a tiny bit sticky on the 4th or so round. That is why I backed off to 64ish. Gotta love the SAUMs. My 20" proof was shooting 64.5 at 2795fps. Curious how much faster yours will be with the extra 2".

Went out and shot the 7SAUM and at 64.5 it was 2,900 FPS.

 

[AnesthesiaMD]

Went out and shot the 7SAUM and at 64.5 it was 2,900 FPS.

That's awesome. Did it shoot well?

 

[Huntnpack]

OP, Apologies for my brief sidetrack.

For any of you 7 SAUM guys that may be interested.

300 SAUM Custom ADG Brass Group Buy?

Huddle Up !!! For those interested in helping to organize an order of 300 SAUM ADG Brass. This may be possible !! Please post your interest & any amount of brass you would commit to buying. We are fully stocked in 7 SAUM if anyone is looking for loaded ammo or brass. We currently have 31...

www.longrangehunting.com

Now back to the regular scheduled programming

 

[bergara0256]

That's awesome. Did it shoot well?

It shot really well for a 500 dollar barrel. I'll take a .3moa.

 

[DACroxton]

I run a 7 SAUM on a stiller predator LA, 26" benchmark barrel with 175 Berger Elite Hunters, Nosler brass, Fed 215M primers and .002" neck tension. COAL is 2.958" CBTO with my gauges is 2.240" which is .030" off the lands and where I found the best accuracy. RL26 I worked up and got a slight ejector mark at 63.5 grains and heavy bolt lift at 63.8, best accuracy was at 62.6 grains and 2996 FPS per my notes. I went back to my old load using H4831SC which is what I had been running previously and was more accurate and better ES/SD in my rifle with a velocity of 2957 FPS.

Buster, I am working on a 7SAUM and would be interested in your load data for the H4831SC powder? Were you using the FED 215M primers in that load?