300 Blackout

[MJPLEO]

<span style="font-size: 14pt"><span style="color: #000099">Gentlemen,

I just finished up my 300 Blackout build and I have to say that it is a lot of fun to shoot. I loaded up 20 rounds (17gr of H110 under 125gr Nosler BT's) and think this is showing some promise. Unfortunately it would not cycle reliably but I think that's due to the light load I tried. I'll make up some more rounds for tomorrow and go from there. Anyone have a "go-to" hunting load for H110 and 125gr Nosler BT's? I have a 16" Wilson barrel with a 1 in 8 twist.

I can see this being more of a novelty until I can get a suppressor but a lot of fun nonetheless.

Both targets were shot from 100 yards lying prone with a front bag rest. The top is five rounds and the bottom one is 12 rounds. The other three of the 20 I made up went in to making sure I was on paper

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[3O8Junkie]

Re: 300 Blackout

Looks like a winner to me! I am guessing once you get your loads figured out it will get even better. Lets see some gun porn! I was just talking about the 300 Blackout at the range this week with a younger guy. I'd love to see yours.

 

[MJPLEO]

Re: 300 Blackout

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ShooterMcGavin33</div><div class="ubbcode-body">Looks like a winner to me! I am guessing once you get your loads figured out it will get even better. Lets see some gun porn! I was just talking about the 300 Blackout at the range this week with a younger guy. I'd love to see yours. </div></div>

Added a couple of pics.

 

[PLeighton]

Re: 300 Blackout

Nice build.
There are some good theads with load data here and over at silencer talk.

For a super sonic accuacy load, try using N110 instead of H110.
The Sierra 110gr & Hornady 110 V-Max are really accurate using super sonic 300 BLK loads as well.

If you think it is fun now, just wait till you put a can on it!

 

[Ballista One]

Re: 300 Blackout

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MJPLEO</div><div class="ubbcode-body">Unfortunately it would not cycle reliably but I think that's due to the light load I tried.</div></div>

Low gas volume is the likely the cause of the reliability issue. Are you experiencing a failure to eject or failure to feed? It will more than likely cycle fine with a suppressor on. If you do not plan on shooting it suppressed, you may want to bump the size of the gas port.

 

[MJPLEO]

Re: 300 Blackout

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: m_gale</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MJPLEO</div><div class="ubbcode-body">Unfortunately it would not cycle reliably but I think that's due to the light load I tried.</div></div>

Low gas volume is the likely the cause of the reliability issue. Are you experiencing a failure to eject of failure to feed? It will more than likely cycle fine with a suppressor on. If you do not plan on shooting it suppressed, you may want to bump the size of the gas port. </div></div>

<span style="font-size: 14pt"><span style="color: #000099">It ejects just fine (leaves a neat pile about 2 feet away) but fails to strip a new round and return to battery. After doing some more reading, the load I tried was definately too light, ie; NEED MORE POWDER! Anyway, I loaded up some 17.5gr and 18.0gr for another function check. I will bring out the Chrony later this week once I have it running like it should.

Thanks everyone for all your suggestions.

Matt</span></span>

 

[AXEMAN]

Re: 300 Blackout

what is the gas port length, it pistol or carbine gas? adjustable gas block?? good looking rifle

 

[BERTMAN77MK2]

Re: 300 Blackout

always at the forefront Matt! want 1 but have several projects to finish 1st--2 boltguns and 7 AR15's

 

[MJPLEO]

Re: 300 Blackout

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: AXEMAN</div><div class="ubbcode-body">what is the gas port length, it pistol or carbine gas? adjustable gas block?? good looking rifle </div></div>

<span style="font-size: 11pt"><span style="color: #000099">Sir,

Thank you for the compliment. It is a carbine length gas tube with a Rainier lo-pro block. Once I put in for a suppressor, I will get an adjustable block, maybe PRI lo-pro adjustable. The trouble will be finding one to fit under that forend as it's a fairly tight fit.

Matt</span></span>

 

[MJPLEO]

Re: 300 Blackout

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BERTMAN77MK2</div><div class="ubbcode-body">always at the forefront Matt! want 1 but have several projects to finish 1st--2 boltguns and 7 AR15's </div></div>

<span style="font-size: 11pt"><span style="color: #333399">You do stay busy Sir. Let's see em' when you get them done. I like seeing the different SH member builds, there are always some good ideas floating around.</span></span>

 

[colt933]

Re: 300 Blackout

I'm getting about 1020fps with 220 SMK and AA 1680 (10.1 I think)

Accuracy is <1MOA at 100 shot through AAC 7.62SD.