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300 whisper barrel? #5427605 11/18/14 02:10 AM
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Hymer Offline OP
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Wanting to get a 300 whisper or 300 blackout barrel for my encore. I don't see any diffrence in the two except, the blackout seems more popular so ammo may be easier to find. What preference do the experts here have?

Re: 300 whisper barrel? [Re: Hymer] #5427622 11/18/14 02:14 AM
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If you get a barrel chambered in 300 whisper, it can not fire the 300 blk out, since the blk out is a longer round. But a 300 blk out can fire either.


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Re: 300 whisper barrel? [Re: Hymer] #5427644 11/18/14 02:20 AM
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So there basically the same other than that? I should just go with the blackout then, right?

Re: 300 whisper barrel? [Re: Hymer] #5427660 11/18/14 02:25 AM
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The Smith & Wesson M&P15 300 Whisper is the only 300 Whisper I have seen that is advertised to shoot 300 Blackout.


It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.

� Dwight D. Eisenhower
Re: 300 whisper barrel? [Re: Hymer] #5427678 11/18/14 02:32 AM
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So if you wanted to get a close range deer rifle for the kids would you get a whisper or the blackout?

Re: 300 whisper barrel? [Re: Hymer] #5427693 11/18/14 02:38 AM
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I got the 300 blackout and love it. I agree with Chad above...... Get the BLKOUT.....


Shhhhhhhh better to be quiet than remove all doubt..
Re: 300 whisper barrel? [Re: Hymer] #5427701 11/18/14 02:39 AM
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I would get the blackout since it will take either.


Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: 300 whisper barrel? [Re: Hymer] #5427710 11/18/14 02:43 AM
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If a S&W 300 whisper can chamber the 300 Blackout, why can't other rifles do the same? Not trying to hijack post, but I'm confused. confused2


The Greatest Enemy of knowledge is not ignorance,
it is the illusion of knowledge.--Stephen Hawking
Re: 300 whisper barrel? [Re: Hymer] #5427775 11/18/14 03:09 AM
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Thanks guys, sounds like I should go with the blackout.

Re: 300 whisper barrel? [Re: Hymer] #5427803 11/18/14 03:22 AM
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300 whisper is a wildcat round invented/patented by J.D. jones of SSK Industries, AAC just tweaked it enough to meet SAMMI specs and "invented" the Blackout. For a barrel to say 300 Whisper they must have SSK authorization, atleast that it what I am led to believe. That's a shortened version of a long story that I'm also sure I'll be corrected on.

Side note my buddy has the 338 whisper, fires a 300gr 338 Sierra HPBT quieter than a pellet gun, it's awesome.


HHUUMMMM, what to write, what to write, I got nothing.
Re: 300 whisper barrel? [Re: Toxarch] #5427893 11/18/14 03:53 AM
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Originally Posted By: Toxarch
The Smith & Wesson M&P15 300 Whisper is the only 300 Whisper I have seen that is advertised to shoot 300 Blackout.


That's what the specs say on the S&W website.


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Re: 300 whisper barrel? [Re: Hymer] #5428076 11/18/14 08:01 AM
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Originally Posted By: Hymer
So if you wanted to get a close range deer rifle for the kids would you get a whisper or the blackout?

Get the Blackout, it will shoot either of them.
I have a 16" and an 8" SBR, both in 300 blackout. I shoot blackout ammo and Hornady Whisper ammo out of both.


It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.

� Dwight D. Eisenhower
Re: 300 whisper barrel? [Re: blackcoal] #5428078 11/18/14 08:18 AM
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Originally Posted By: blackcoal
If a S&W 300 whisper can chamber the 300 Blackout, why can't other rifles do the same? Not trying to hijack post, but I'm confused. confused2

The Whisper was made from a .221 case, and blackout is from a 5.56 case. Different throat sizes, specs are close, but use different reamers. Apparently the shorter, tighter throat in the Blackout case increases pressure when shot in a Whisper chamber and could exceed SAAMI max pressures. I'm no pro and that info is just a choke and puke from when I was looking up stuff before buying my blackout.


It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.

� Dwight D. Eisenhower
Re: 300 whisper barrel? [Re: Hymer] #5428371 11/18/14 02:31 PM
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It has to do with the overall length and SAAMI spec. The blk out chamber has a longer throat than the Whisper. So, the blk out bullets are seated out longer for increased powder capacity. This increased powder capacity allows increased pressure and proper cycling in an AR platform, which it was designed for. The 300 Whisper does not have a SAAMI spec, which means that it is "technically" a wildcat still, with varying case dimensions and chamberings. The 300 blk out has a SAAMI spec, meaning exact case drawings and chambering size on file. If you set a fired case of each next to each other, you can not tell them apart. They have the same case dimensions. But it's the overall length of the bullet that is the difference.


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Re: 300 whisper barrel? [Re: Toxarch] #5428380 11/18/14 02:34 PM
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Originally Posted By: Toxarch
The Smith & Wesson M&P15 300 Whisper is the only 300 Whisper I have seen that is advertised to shoot 300 Blackout.


Yes. If you increase the throat by .015", you have a blk out. Hornady has done 2 things. They want to sell their 300 Whisper ammo, so they chamber it in Whisper/blk out. If they increase the throat by .015", it can do both. Kill 2 birds with one stone.


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Re: 300 whisper barrel? [Re: Hymer] #5428487 11/18/14 03:13 PM
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Also, there are 2 main reamers used in the 300 blk out. The SAAMI reamer, which is the larger reamer. And the Wilson/Noveske "match" reamer which is .006" smaller than the SAAMI reamer. Why is this important?

The SAAMI reamer is based on MAXIMUM case dimensions. It is a large chamber and allows any cases or ammo to fit inside.

The Noveske/Wilson match reamer is a MINIMUM spec reamer. Meaning that it is based on the smallest (minimum) case dimensions of the blk out. It has a neck that is smaller, and it has the shoulder bumped back .006" shorter than max. The difference between min and max on the blk out is .006". It may not sound like much, but that's a normal difference between min and max (most rounds are either .006" or .007" between SAAMI min and max). The blk out was based on using cut down 5.56 military brass. This brass is much thicker. To make the blk out brass, you have to cut the case just below the shoulder of the 5.56 case. This is a thick area of the case. The case wall of the 5.56 is now the neck of the blk out round. This makes the necks thicker on the blk out with 5.56 brass, which makes a very tight fit on a minimum chamber. Next is the shoulder. The shoulder is .006" shorter than max. When you seat a bullet in a cut down 5.56 case in the blk out, it swells the case out more in the shoulder area to fit the bullet in (about .003" to .005", depending on the bullet). This swelling or increase in shoulder dimension can easily push your shoulder dimension over the minimum spec, but still be under max SAAMI spec. If the shoulder increases (even .001"), it will not chamber in a minimum spec chamber. This becomes a major issue.

Why you would make a tight/match chamber in an AR platform rifle goes against the grain? The AR is a battle rifle and needs to chamber and extract 100% of the time. By using a minimum spec chamber, you are creating chambering issues if any dirt or debris get into the chamber. If you shoot subsonic ammo suppressed, you will get a lot of powder fouling blowing back into this match chamber, and will start having chambering issues. The blk out round is not a "match" round and will not be used in long range competition, like the 223 Rem is. I truly do not know why you would put a tight, "match" chamber in an AR platform chambered in 300 blk out.


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Re: 300 whisper barrel? [Re: Hymer] #5431865 11/19/14 10:32 PM
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I have my contender chambered for rimmed Blackout - had to be different (300 blackout rebated with a 38/357 rim - I use 357 parent brass). I am happy enough with the MGM barrel. Only issue is crimps - the brass is 0.1 short and the crimp dies hate that.

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