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Old 10-12-2017, 05:05 PM   #1
hoythitman
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Default Need help on understanding Gas volume and Chamber pressure

I am building a new rifle. Pretty set on going 7 SAUM. Here is the problem, I prefer shooting suppressed, I have a SilencerCo Omega 300. Rated up to 300 win mag.

300wm uses significantly more of the same powder at basically the same chamber pressure as the SAUM.

I sent an email to SiCo they said itís not rated for any ultra mag. I clarified it was short action UM and said no. I canít imagine something using less of the same powder at the same pressure being unsafe but I want to figure out a way to tell gas volume because that is what he referenced.

Any help greatly appreciated

For reference 7SAUM 180 load data says 65 grains of H1000 being max.

300 WM starting load for 180 is 78 grains of h-1000




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Old 10-12-2017, 05:42 PM   #2
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I'd wager the person heard ultra mag and stopped there probably not knowing the difference between ultra mags and short action ultra mags. I'm not a silencer expert, but I do know a lot about reloading and can't imagine that silencer not handling the 7 SAUM.

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Old 10-12-2017, 07:00 PM   #3
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Interesting. I can't see how the gas volume could be greater with the 7 SAUM but since the 7 will be higher velocity, the silencer would need to dissipate the gas over a shorter period of time. Chamber pressures may be equal but the pressure in the suppressor could be higher with the 7. Like anything else, the manufacturer will err on the side of safety to minimize risk of being sued. Be sure to let us know what happens when you shoot it ��
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Old 10-12-2017, 07:12 PM   #4
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Communication!? I’d call back! Main thing is not going against manufacturers recommendations for warranty sake (assuming suppressors have warranties).
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Old 10-12-2017, 08:32 PM   #5
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Call em back up and ask them if it will run a 7 wsm or 300 wsm. No way a 7 saum is running more pressure than either of those 2 cartridges.
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Old 10-12-2017, 09:40 PM   #6
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Update. It is safe with the WSMís


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Old 10-12-2017, 10:00 PM   #7
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Wouldn't the best thing to do is run your load through quick load to find out the specific pressure in the 7saum? I don't know enough to answer the question but I think there's a lot of factors that go into pressure but quickload should give you an accurate number to compare with 300wm. I would not be disregarding SiCo's advice easily. It's potentially an expensive experiment; and if they figure out your Omega was over pressured, you might be kissing your suppressor goodbye.

I'm interested because I'm considering a 6.5saum and one of my cans is an Omega.


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Old 10-13-2017, 10:54 AM   #8
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It's not the chamber pressure, which is what a calculator will tell you, but the pressure in the can you need to consider. You can go by what the can manufacturer says or you can experiment.
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Old 10-13-2017, 02:42 PM   #9
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Quote:
Originally Posted by treestand View Post
It's not the chamber pressure, which is what a calculator will tell you, but the pressure in the can you need to consider. You can go by what the can manufacturer says or you can experiment.


I know. Iím just perplexed is all. On paper it looks the same or less that other rounds that are safe. 7 mag 180 Berger loads are using 10-15 more grains of powder. Going 100fps or so faster and itís safe to shoot that through a 20Ē barrel. But I canít shoot a lighter powder charge a little slower through a 28Ē tube and be safe. Doesnít make sense.

I talked to someone else at SiCo who said they were going to look further into it because it should be susafe through the Omega. Said their list says all UMís long and short but the short is, in his opinion lower volume, lower speed, and same pressure as 7 win mag or 7/300 mag which itís ok for


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Old 10-14-2017, 08:28 AM   #10
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Quote:
Originally Posted by hoythitman View Post
I know. Iím just perplexed is all. On paper it looks the same or less that other rounds that are safe. 7 mag 180 Berger loads are using 10-15 more grains of powder. Going 100fps or so faster and itís safe to shoot that through a 20Ē barrel. But I canít shoot a lighter powder charge a little slower through a 28Ē tube and be safe. Doesnít make sense.

I talked to someone else at SiCo who said they were going to look further into it because it should be susafe through the Omega. Said their list says all UMís long and short but the short is, in his opinion lower volume, lower speed, and same pressure as 7 win mag or 7/300 mag which itís ok for


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Makes sense. The 7 SAUM shouldn't be much, if any, different, than those. Can you let us know what they say?

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Old 10-14-2017, 08:52 AM   #11
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Quote:
Originally Posted by LWD View Post
Makes sense. The 7 SAUM shouldn't be much, if any, different, than those. Can you let us know what they say?



LWD


Ok. So, the SAUM has an almost identical uncorking pressure and less volume than the wsm. But ďI still canít say yes.Ē I think they are afraid to give the go ahead to something with ďultra magĒ in the name in case someone ran a regular UM through it. So Iíll be shooting through it.


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Old 10-14-2017, 09:17 AM   #12
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He said I can buy a program that will work all of it out but itís $150 and Iím not. Lol


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