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7 saum

I’m using a .314 bushing with ADG brass and a 21st .284 expander mandrel.

I got my rifle back from PCR about a week ago so should hopefully get some data soon.

I have several bullets but probably shoot mostly Berger 180s with N565 or R26.

Win M70 WSM action
Brux #5 @26”
McM Game Scout
Talley LW rings
Vortex HD LH-T
Throated for a Berger 180 @ 3.0”
Right at 10 lbs

79A40913-7D4C-456A-BC96-991FC2A3116D.jpeg
 
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I hit in the improved SAUM 26"
 
Steel head said:
Cci #200 or fed 210m’s


😂
Not without possibly having a Kentucky ballistics moment.
2880 is doable without wrecking brass in my 28”tube.
My new 30” maybe will do 2910ish???
Click to expand...
Right on. Seen few other post online guys sayn getn 3k with 26 inch tube and relaoder 26. Hard to believe. Mine will.b here next week. 32 inch with long action running the 190s long. So maybe 2950-3k will post what i see
 
Axel314 said:
Right on. Seen few other post online guys sayn getn 3k with 26 inch tube and relaoder 26. Hard to believe. Mine will.b here next week. 32 inch with long action running the 190s long. So maybe 2950-3k will post what i see
Click to expand...
Yea
How’s their brass life?
Lots of people load thermonuclear to brag regardless of the effects.
But the don’t tell you about the time they beat the bolt open on a warm day on a stump.
A 32 inch tube will certainly get you closer
 
Steel head said:
Yea
How’s their brass life?
Lots of people load thermonuclear to brag regardless of the effects.
But the don’t tell you about the time they beat the bolt open on a warm day on a stump.
A 32 inch tube will certainly get you closer
Click to expand...
O i agree with ya. My goal was to cruize them at 2950. We shall see. B trying h1000 and rl26 with 190 a tips and 190 bergers.
 
Axel314 said:
O i agree with ya. My goal was to cruize them at 2950. We shall see. B trying h1000 and rl26 with 190 a tips and 190 bergers.
Click to expand...
I’ve had some amazing vertical and results cruising in 190LRHT and I don’t sweat if it gets hot out or starts raining.
 
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I’m hoping to get somewhere near 2900 with the 180 eldm’s with H4831sc in ADG brass.
I’m just waiting on my damn barrel which was ordered on Jan 5th, with a supposedly 5-7 week lead time.
 
I’m wanting to have a barrel spun for my impact action in a 7 SAUM. I have the chance to get Retumbo and wanted to know if that would oils work for Berger 180’s. Thanks in advance
 
190 a tip with rl26 long action. 32 inch bartlein. Just a steel banger. Really impressed with the speed so far. 40 rounds on the tube
20210510_183131.jpg
 
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Steel head said:
R26?
If so you’re about 72k
Click to expand...
Yup rl26. Gonna try h1000 also. Dont see any pressure signs so far with rl26. I went another grain above this load and still no pressure. Rather run h1000. Seems to b mlre stable powder
 
Axel314 said:
Yup rl26. Gonna try h1000 also. Dont see any pressure signs so far with rl26. I went another grain above this load and still no pressure. Rather run h1000. Seems to b mlre stable powder
Click to expand...
If you don’t push R26 it’s about as stable as H1000.
 
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Anyone have any experience with all copper solids in the 7 SAUM? I'm putting together a 7 SAUM for a sheep hunt early next year and looking at the PVA Cayuga (151 & 170 gr) copper solids as an alternative to very scarce Berger VLDs, Hornady ELD-Xs, and Nosler ABLRs. It'll be a short action so mag length, deep seating, and velocity compromises may come into play. Seems like a 150gr copper solid could go nice and fast while still having the long, sleek profile of the traditional 180-190s?
 
ifgator said:
I’m wanting to have a barrel spun for my impact action in a 7 SAUM. I have the chance to get Retumbo and wanted to know if that would oils work for Berger 180’s. Thanks in advance
Click to expand...
Yes, if you have a 26" plus barrel. Same velocity as H-1000 with 0.5g more retumbo
 
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Ran some 175 elite hunters through my saum awhile back.
56.3 grains of 4350 got me 2950. Adg brass, 24" barrel , absolutely no pressure.
My buddy runs 175s at 2950 with a 26" barrel with 55.8 grains 4350. Group size is almost the same in both guns , Both r hunting rifles . Not one hole groups, this is 5shots in my saum. Es under 10 for 5 shots. For a hunting rifle I have no problem with this. If I was shooting at 2000 yards all the time I would definitely want better
16218926131892382917599693304967.jpg
 
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That's awesome! Good to know that H4350 is giving you speeds and groups like that. I just got ahold of some Norma brass, Berger 180gr Hunting VLDs, and I'll be fueling them with 4350 as well. Probably have to use a few more grains than you are since I don't have ADG brass. The barrel will be a 26" Proof Sendero light with an 8.6 twist. Can't wait to get it put together.
 
wyliecoyote said:
That's awesome! Good to know that H4350 is giving you speeds and groups like that. I just got ahold of some Norma brass, Berger 180gr Hunting VLDs, and I'll be fueling them with 4350 as well. Probably have to use a few more grains than you are since I don't have ADG brass. The barrel will be a 26" Proof Sendero light with an 8.6 twist. Can't wait to get it put together.
Click to expand...
Be careful. I’m using Norma brass and I’m getting heavy bolt lift with 175 elite hunters at 56g of H4350, and another user a little ways back pressured out below 54gr with 180s and ADG brass. As always start low and work up.
 
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Jabot said:
Ran some 175 elite hunters through my saum awhile back.
56.3 grains of 4350 got me 2950. Adg brass, 24" barrel , absolutely no pressure.
My buddy runs 175s at 2950 with a 26" barrel with 55.8 grains 4350. Group size is almost the same in both guns , Both r hunting rifles . Not one hole groups, this is 5shots in my saum. Es under 10 for 5 shots. For a hunting rifle I have no problem with this. If I was shooting at 2000 yards all the time I would definitely want better View attachment 7632694
Click to expand...
Also along with this ,my throat is very long. With the 180 hybrid seated at 2.914so they feed reliably they are being jumped 100 thousand. I forget how far the 175 r jumping
 
Jabot said:
Also along with this ,my throat is very long. With the 180 hybrid seated at 2.914so they feed reliably they are being jumped 100 thousand. I forget how far the 175 r jumping
Click to expand...
Checked notes 175s are being jumped 100 thousandths also
 
Jabot said:
Checked notes 175s are being jumped 100 thousandths also
Click to expand...
Jabot what primers are you using? I have been playing with ELD X 175@ mag length, Fed 210M, Norma 7 SAUM brass. I started getting heavy bolt lift consistently on 56.6 of H4350. I was struggling to push 2900 running a 24" proof carbon. I also have RL23 to play with and I'm switching to CCI 200s to see what that does. Barrel has 156 rounds on it so it should be leveling out if it hasn't already.
 
Funny u post this ,went and did primer test this morning. Don't bother with federal 215s. Br-2 3 shot es 5. Sd 2.9.
I know that's not a huge sample, but it will work for me.
16224907760847289139914073275462.jpg
 
So, just Shooting loads with new ADG brass and waiting till the Bartlein barrel speeds up, have 69 shots down the pipe.
Rifle: anTi XM action, Bartlein 22” #4 CFW
TBAC Ultra 7 CB and new Dominus CB
Load:
168 Nosler ABLR
58.0 R23
ADG new brass
Tula LRM primer

5 shots with Ultra 7:
2775
2775
2748
2749
2756
E=27
M=2760
S=12

13 shots with Dominus:
group 1
2763
2756
2746
2772
E=26
M=2759
S=11

Group 2
2756
2742
2768
2768
2764
E=26
M=2759
S=11

Group 3
2765
2761
2762
2758
E=7
M=2761
S=2

All 4 groups have a M = 2759 to 2761, so the mean velocity is about spot on
looks like I have an Extreme of 2775 high to 2742 low which = 33
Does that seem low, average, or high for new brass and a new barrel?
How do you calculate the SD for all 18 shots?

Thanks. I might try Federal GM210M primers also.
 
Last edited:
Another 30-50 rounds your barrel should be done speeding up. Until then I would worry to much about numbers. Do a velocity test after it settles in. Pick a speed u want to run it at. But in es of 33 on 5 shots would concern me a little, what's that going to be like in 10-15 shots. But numbers aren't everything, seen rifles with horrible numbers shot outstanding. Just my opinion, not saying I know everything
 
XTREM HTR16 said:
So, just Shooting loads with new ADG brass and waiting till the Bartlein barrel speeds up, have 69 shots down the pipe.
Rifle: anTi XM action, Bartlein 22” #4 CFW
TBAC Ultra 7 CB and new Dominus CB
Load:
168 Nosler ABLR
58.0 R23
ADG new brass
Tula LRM primer

5 shots with Ultra 7:
2775
2775
2748
2749
2756
E=27
M=2760
S=12

13 shots with Dominus:
group 1
2763
2756
2746
2772
E=26
M=2759
S=11

Group 2
2756
2742
2768
2768
2764
E=26
M=2759
S=11

Group 3
2765
2761
2762
2758
E=7
M=2761
S=2

All 4 groups have a M = 2759 to 2761, so the median velocity is about spot on
looks like I have an Extreme of 2775 high to 2742 low which = 33
Does that seem low, average, or high for new brass and a new barrel?
How do you calculate the SD for all 18 shots?

Thanks. I might try Federal GM210M primers also.
Click to expand...
You can use your google foo to find a calculator but you will have to do some math up front or just use this this figure out how to do it by hand. https://en.wikipedia.org/wiki/Standard_deviation

You get an avg of the velocities, subtract that avg from each velocity then square each of those numbers. Add all of the squared numbers divide that total number by total count of velocities (18 if I'm counting the number of data points above correctly). Take the square root of the divided number.
 
Jabot said:
Funny u post this ,went and did primer test this morning. Don't bother with federal 215s. Br-2 3 shot es 5. Sd 2.9.
I know that's not a huge sample, but it will work for me. View attachment 7637604
Click to expand...
I feel like I've had a recurring case of CRS with this gun for some reason. I'm starting over again, redoing my ladder to find a barrel whip node then going to screw around with depth. My gunsmith recommended running the 162s with the CCIs but I found a deal I couldn't refuse on 175s and had several thou of the 215Ms at the time and no CCIs which lead me down this evil path. Now 162 ELDX are unobtainium and since this is a hunting gun, I would prefer the X to the M's.

In a SA with mag length those things are buried in the case. Neck tension and powder compression are going to be key with those long 175s. I stumbled on another thread earlier today and above 56gr seems to be the common caution point of H4350 in a SA with 175s, 180s. I think I got to 56.6 with heavy bolt lift and some 56.3s were stout too. Tried H4831 but wasn't happy with speeds. Another person recommended RL23, and I've only got a lb of it but want to see what it will do. I had to interpolate data and tried a few last range outing, was like a canon going off compared to my H4350. Velocity shouldn't be an issue with it. Definitely more energetic than the 4350, but then again it was 5+ grains more than my other loads.
 
99106 said:
You can use your google foo to find a calculator but you will have to do some math up front or just use this this figure out how to do it by hand. https://en.wikipedia.org/wiki/Standard_deviation

You get an avg of the velocities, subtract that avg from each velocity then square each of those numbers. Add all of the squared numbers divide that total number by total count of velocities (18 if I'm counting the number of data points above correctly). Take the square root of the divided number.
Click to expand...
Thanks. Got a SD of 9.5
 
99106 said:
I feel like I've had a recurring case of CRS with this gun for some reason. I'm starting over again, redoing my ladder to find a barrel whip node then going to screw around with depth. My gunsmith recommended running the 162s with the CCIs but I found a deal I couldn't refuse on 175s and had several thou of the 215Ms at the time and no CCIs which lead me down this evil path. Now 162 ELDX are unobtainium and since this is a hunting gun, I would prefer the X to the M's.

In a SA with mag length those things are buried in the case. Neck tension and powder compression are going to be key with those long 175s. I stumbled on another thread earlier today and above 56gr seems to be the common caution point of H4350 in a SA with 175s, 180s. I think I got to 56.6 with heavy bolt lift and some 56.3s were stout too. Tried H4831 but wasn't happy with speeds. Another person recommended RL23, and I've only got a lb of it but want to see what it will do. I had to interpolate data and tried a few last range outing, was like a canon going off compared to my H4350. Velocity shouldn't be an issue with it. Definitely more energetic than the 4350, but then again it was 5+ grains more than my other loads.
Click to expand...
I wouldn't get to hung up on velocity if it shoots good at 2890 , run it there. Truthfully what's another 50 fps going to do. It's not going to make it leaps and bounds better. Also if you can find adg brass, I'm sure it would help your numbers. I run Norma in my 6xc , I can't get great results as far as numbers go with it either.
 
Agreed. Settled on if I can make above 2850 without pressure I would be happy. Was moving the direction of trying ADG too just haven't found it in stock or backordered it yet. I have pinged Peterson and Lapua every opportunity I've had when seeing their reps face to face, but no love so far. I managed to snag 200 rounds of Norma @$125 hundred because it was scarce for a while even before the insanity started. I'm kind of questioning that decision after having to ream primer pockets. The 215Ms were sitting proud in more than half of the 50 loaded. Checked them again for seating but couldn't get them to go any deeper. Punched those, reamed and now they sit flush.
 
I have a ARC Nucleus + Proof Barrel 7SAUM heading my way soon. Looking forward to breaking her in and working up my load. Action will be going in a Manners T6A and I have 1000 Berger 180 Hybrids waiting!

fmetz
 
fmetz said:
I have a ARC Nucleus + Proof Barrel 7SAUM heading my way soon. Looking forward to breaking her in and working up my load. Action will be going in a Manners T6A and I have 1000 Berger 180 Hybrids waiting!

fmetz
Click to expand...
A modified ARC magazine feeds 7 saum wonderfully in my Nuke.
 
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Steel head said:
A modified ARC magazine feeds 7 saum wonderfully in my Nuke.
Click to expand...
Modified how so? I'm setting up a very similar thing (Proof 7 SAUM barrel, Manners T6A, 180gr Berger VLDs) but using a short Mausingfield instead of a Nuke. I've got a bunch of Accurate 300 WSM DSSF mags for the build but was steered away from ARC mags for some reason I unbeknownst to me at this time. Can't remember why I thought the Accurate mags would work better . . . they certainly might . . . just interested in your take on ARCs. They are top notch for sure.
 
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