The 6UM

[Elkster23]

I only ask cause I'm doing an 18" 25-7prc. Here is thunderbeasts limits on the ultra 7 ill be using. I think i should be good.
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I run an ultra 7 on my 18in barreled 6um. Around 3250. No issues yet.

 

[Ryan Avery]

I only ask cause I'm doing an 18" 25-7prc. Here is thunderbeasts limits on the ultra 7 ill be using. I think i should be good.
View attachment 829774

You will be in the mid-60s on powder. It should be fine.

 

[Brandon.miller.4]

You will be in the mid-60s on powder. It should be fine.

Not to repeat myself, but if there's no issues on 18" barrels why do most seem to be running 20" or more with the 6um? Curious more than anything.

 

[Formidilosus]

Not to repeat myself, but if there's no issues on 18" barrels why do most seem to be running 20" or more with the 6um? Curious more than anything.

Because most people are ignorant on short barrels and already believe a 20” is wildly short; and/or the want more MV hence the 6UM to begin with.

 

[HighUintas]

One reason a person may want a longer barrel is reduced noise/blast. Even if you're using a suppressor on a 16" 5.56, the shooter's ear dB is close to or above 140 for most suppressors tested in TBACs 2024 suppressor summit. A longer barrel will reduce that further, but is one of those personal preference tradeoffs

 

[NSI]

One reason a person may want a longer barrel is reduced noise/blast. Even if you're using a suppressor on a 16" 5.56, the shooter's ear dB is close to or above 140 for most suppressors tested in TBACs 2024 suppressor summit. A longer barrel will reduce that further, but is one of those personal preference tradeoffs

Not comparable to an extra equivalent length of suppressor attached.

-J

 

[rbutcher1234]

One reason a person may want a longer barrel is reduced noise/blast. Even if you're using a suppressor on a 16" 5.56, the shooter's ear dB is close to or above 140 for most suppressors tested in TBACs 2024 suppressor summit. A longer barrel will reduce that further, but is one of those personal preference tradeoffs

These two scenarios aren’t even remotely comparable. ANY suppressed 16” will be massively superior to a barrel length of equivalent caliber, any length. Even with the worst suppressor.

 

[HighUintas]

Not comparable to an extra equivalent length of suppressor attached.

-J

These two scenarios aren’t even remotely comparable. ANY suppressed 16” will be massively superior to a barrel length of equivalent caliber, any length. Even with the worst suppressor.

I'm talking about a 16" suppressed gun vs a 20" suppressed gun.

Not a suppressed vs not suppressed/long barrel scenario

 

[NSI]

I'm talking about a 16" suppressed gun vs a 20" suppressed gun.

Not a suppressed vs not suppressed/long barrel scenario

Yes. And I’m talking about the outsized decibel reduction value that comes from spending additional length on a higher volume suppressor rather than carrying around an equivalent total length made up by a lower volume suppressor and additional barrel. Barrel is for velocity. Suppressor is for …. Suppressing.

-J

 

[HighUintas]

Yes. And I’m talking about the outsized decibel reduction value that comes from spending additional length on a higher volume suppressor rather than carrying around an equivalent total length made up by a lower volume suppressor and additional barrel. Barrel is for velocity. Suppressor is for …. Suppressing.

-J

Yes I agree, but I have 1 suppressor only. So if I'm concerned about shooting it while hunting without hearing protection, I might choose a 20" over 16" for a 6um. This is part of the reason I'm waffling on having my 243 cut back or not. So for someone in the 1 suppressor boat, that may be a consideration for them.

 

[rbutcher1234]

Sounds like you need a second can

 

[Brandon.miller.4]

Good info, had the dominus or magnus cans been available at the time, I definitely would have gone that route for the added volume. For now, I'll use what I have and be happy with my 18" barrel.