7mm SAUM Starting loads

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Singo85
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Location: NSW

7mm SAUM Starting loads

#1 Postby Singo85 » Thu May 04, 2017 5:30 pm

Hoping to speed up the development of my SAUM. So after some ball park loads to get to 2950.

Barrel is a Bartlin 32 in 8.5. Will be using BR2 primers and have both 2209 and 2213sc and Berger Hybrids.

Any help with a ball park number so I can look for a node instead of a velocity on Saturday.
Cheers
Michael "Machine Gun" Singleton

Tim N
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Joined: Fri Jan 25, 2013 8:18 pm
Location: Branxton NSW

Re: 7mm SAUM Starting loads

#2 Postby Tim N » Thu May 04, 2017 7:14 pm

My current bartlein saums use about 56.5 of 09 to reach 2950 with hybrids
We don't rise to the level of our expectations, we fall to the level of our training. Archilochos 680-645 BC

DenisA
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Joined: Wed Nov 09, 2011 7:00 pm
Location: Sunshine Coast, QLD

Re: 7mm SAUM Starting loads

#3 Postby DenisA » Thu May 04, 2017 8:06 pm

Is everyone running 8.5 twist SAUMS? For the 183 SMK's and in anticipation of 195 Bergers?

ajvanwyk
Posts: 134
Joined: Tue May 17, 2016 5:50 pm

Re: 7mm SAUM Starting loads

#4 Postby ajvanwyk » Thu May 04, 2017 11:02 pm

I run a 1 in 9 and same as Tim, 56.5 of 09 to achieve 2950. The node that have worked for me sat between 2870 and 2890...

shooter mcreid
Posts: 320
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Location: Ipswich

Re: 7mm SAUM Starting loads

#5 Postby shooter mcreid » Fri May 05, 2017 7:56 am

Dennis, I have a 1:9, 2 x 1:9.5, a gain twist 10 to 9.25 and finally a 1:8.25.
The 9.5s seem to be working great for 180s and the 8.25 is well suited to the sierra 183s.
My 30" saums required around 55.9gr of 2209 to be around the 2950 mark, my 28" saums require 56.4 to get close to 2950.
Michael, I would think you would require somewhere in the high 55s to get 2950, then again I was suprised by tims load.

Matt P
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Joined: Mon Nov 14, 2005 8:22 pm

Re: 7mm SAUM Starting loads

#6 Postby Matt P » Fri May 05, 2017 8:11 am

Hi All
I have 3 SAUM's and 2 of the 3 run 56.2 of 09, one with VLD's and the other with Hybrids, the Bartlien with VLD's runs at 2950 and the Brux with Hybrids runs at 2915. The other I'm still playing with, down loaded to 284 speeds.
Matt P

ajvanwyk
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Joined: Tue May 17, 2016 5:50 pm

Re: 7mm SAUM Starting loads

#7 Postby ajvanwyk » Fri May 05, 2017 8:17 am

Shooter, what brand of barrel are you running ? 55.9 of 09 gives me no more than 2890/2900 in a 32" Bartlein. Given that you are 2" shorter I am surprised with your velocities. The other variable could also be the batch of 09, not that I have much experience on which lot numbers run hotter than others.

Albert

shooter mcreid
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Location: Ipswich

Re: 7mm SAUM Starting loads

#8 Postby shooter mcreid » Fri May 05, 2017 8:36 am

Albert, all barrels are Bartleins. maybe it is the powder? the two 9.5s are still young so possibly will slow down after a 200 or so rounds. The plan is to tune them very soon so ill report back with what they show for a bit of confirmation.

macguru
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Joined: Wed Aug 05, 2009 9:49 am

Re: 7mm SAUM Starting loads

#9 Postby macguru » Sat May 06, 2017 11:44 pm

Singo you probably needed more powder today for 2950 because its a new barrel. I bet it speeds up after another 100 rounds....

macguru
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Re: 7mm SAUM Starting loads

#10 Postby macguru » Sat May 06, 2017 11:54 pm

Screen Shot 2017-05-06 at 11.53.39 pm.png
Another tuning question .... What primers are people using BR2s , federal match ?? ..... I am using BR2s.

I get the odd high 6 - low 6 with the rest x ring elevation. This generates the odd 5 when mis-handled . Can it be the primer flash ? And some BR2s are 5.1, most 5.2 and some 5.3gr ... Is it the amount of chemical in the cup ? If so the shape of the energy curve would be a little different.....

I mean the other barrel is a 6 and it behaves alot better. (BR4s in that case...). I said i would never batch primers but .... I am definitely going to try some federals and see if i get the same group shape. see above. I am using 54.3 gr 2209, i think low 2900s. 8 twist pacnor super match.
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Last edited by macguru on Sun May 07, 2017 5:52 pm, edited 2 times in total.

shooter mcreid
Posts: 320
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Location: Ipswich

Re: 7mm SAUM Starting loads

#11 Postby shooter mcreid » Sun May 07, 2017 3:24 pm

Did some load testing on one of the 30" 9.5s this morning and found a good spot to be at 55.3gr, 180 vlds jumped 30 thou. Lab radar gave the average velocity of 2930fps.

Singo85
Posts: 91
Joined: Tue Mar 08, 2011 11:04 am
Location: NSW

Re: 7mm SAUM Starting loads

#12 Postby Singo85 » Sun May 07, 2017 4:06 pm

I did some testing yesterday.
Load and avg velocity below 180hyb touching lands with 2209 powder br2 primers
55.5 2890
55.8 2910
56.1 2925 bolt lift becoming firmer
56.4 2930 hard bolt lift
56.7 2955 hard bolt lift
Cheers
Michael "Machine Gun" Singleton

DenisA
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Joined: Wed Nov 09, 2011 7:00 pm
Location: Sunshine Coast, QLD

Re: 7mm SAUM Starting loads

#13 Postby DenisA » Sun May 07, 2017 5:09 pm

Tighter twists should produce slightly less velocity.

Brad Y
Posts: 1880
Joined: Fri Jun 26, 2009 8:21 pm

Re: 7mm SAUM Starting loads

#14 Postby Brad Y » Sun May 07, 2017 9:31 pm

How many firings per case are you getting from that 56 odd grains of 2209 at 2920?

ajvanwyk
Posts: 134
Joined: Tue May 17, 2016 5:50 pm

Re: 7mm SAUM Starting loads

#15 Postby ajvanwyk » Mon May 08, 2017 6:23 am

Brad Y wrote:How many firings per case are you getting from that 56 odd grains of 2209 at 2920?


Brad, I've been running 55.8 (so pretty close to your question) and after about 5-6 firings per case, still do not have any primer pocket issues. That said, 55.8gn of 2209 was only about 2880 ftp in my barrel. Hope this helps.

Albert


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