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Here in IA we can't buy stamps for SBR's so it's what I need to do if I want a shorty. Any recommendations on a good barrel length? Iv'e read a lot of people go 10.5" to keep the OAL under 26, does a pistol need to be? I will be using a Sig brace if I build this thing. Thanks for any info and suggestions.

While I have your attention, is a 300 even worth building if we cant have silencers here? maybe I just need to stick with 5.56? So many choices, never enough money :lol:
 

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While I have your attention, is a 300 even worth building if we cant have silencers here? maybe I just need to stick with 5.56? So many choices, never enough money :lol:
A 300 makes a better pistol than 5.56 due to the ballistics of the rounds. 300 doesn't lose nearly as much velocity is a short barrel as 5.56


Chart of velocity for 6.8/.300/5.56 velocity by barrel length. Anyone have one that includes 6.5? - AR15.COM

For quick reference: 300 BLK at 16" gives 2400 fps with the rounds in the article; a 8" gives 2050 fps (14.6% reduction). In terms of muzzle energy, that is 1407 ft/lbs to 1062 ft/lbs (24.5%). 5.56 with same lengths is 3050 fps and 2475 fps (18.9%), or 1136 ft/lbs to 748 ft/lbs (34.2% decrease)

If you increase bullet weight in the 300, the ballistics change less per inch of barrel loss too, I believe. (can't find the numbers)

I just built a 300 pistol, but of course I am moving to MO in a month so I can SBR is I choose to :D
 

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Here in IA we can't buy stamps for SBR's so it's what I need to do if I want a shorty. Any recommendations on a good barrel length? Iv'e read a lot of people go 10.5" to keep the OAL under 26, does a pistol need to be? I will be using a Sig brace if I build this thing. Thanks for any info and suggestions.

While I have your attention, is a 300 even worth building if we cant have silencers here? maybe I just need to stick with 5.56? So many choices, never enough money :lol:
I'm just curious as to how you and millions of other "subjects" can live under such tyranny and still call yourselves Americans? ;)

Seriously, though, a friend of mine sells hundreds of thousands of rounds of .300 Blackout annually, and he does a lot of R&D. He recently bought a .300 Blackout pistol, but he does shoot suppressed. I can't fathom shooting a .300 Blackout pistol that's not suppressed, but that's just my personal opinion.

I do own and shoot a .300 Blackout, but it's a 16" M4. I really like the round, but my main purpose is to shoot suppressed, also.
 

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If youre not gonna put a can on it, I see no point in the round. Good luck finding more than 60 rounds at a time :lol:
 

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If youre not gonna put a can on it, I see no point in the round. Good luck finding more than 60 rounds at a time :lol:
Reloading. Even by scrounging a pound here and another here I am loading at .60/round with Hornady interlocks and about .70 with Mosley ballistic tips

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Understood. Seems to be a lot of work for a round designed to be supressed, that I cant supress.

Id go 10.5" -556, then whenever the laws allow, grab a 300 BO barrel and submit my form 4. Thats just me, though.
 

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I have an unlimited supply of .300 Blackout ammo, and I do enjoy shooting mine without a suppressor. If I hunted deer, I'd feel comfortable hunting them with my .300 Blackout M4 with 110-147 gr bullets, out to 200 yds. Most shots around where I live are under 100 yds.

I'm about to acquire 1000 220 gr. Sierra Matchkings for loading subsonically.
 

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I have an unlimited supply of .300 Blackout ammo....
This would be the only way I would go 300.

For those not as fortunate, Six8 is excellent out of short barrels. Less expensive and a breeze to reload.

Ive looked into getting into 300 and everytime I looked for inventory...OOS. Then when it shows up 3 months later, its $2 a round and its a small supply. Reloading is a great alternative though, but why bother when the availability and cost of other rounds are more end user friendly? Just my .02
 

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Ive looked into getting into 300 and everytime I looked for inventory...OOS. Then when it shows up 3 months later, its $2 a round and its a small supply. Reloading is a great alternative though, but why bother when the availability and cost of other rounds are more end user friendly? Just my .02
I do agree it is sort of a pain. However, at least for me, I intend to get a suppressor, so I will at least be using it to its full potential. Plus once I reload a few sets and am reusing brass for the second, third time, the price isn't too much worse than reloading premium .223

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since I can't use a can for hunting, I decided to go with a 6.8 over a 300. All the high performance supersonic 300 rounds are as light as the 6.8 rounds and have less oomph behind them.
 

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I just don't find cutting off .223 cases to be that much of a "pain." I use a jig with a Harbor Freight 2" cutoff saw, and I can process a lot of brass in a hurry. After that, it's just like loading any other bottleneck.

500 pieces of .300 Blackoiut brass will probably last me a long time. For those of you interested in buying commercial .300 Blackout in lots of at least 1000 rounds @ about $.90-or-less per round, then I know where you can get a bunch.

As I've previously stated, one of the advantages of .300 Blackout is that a barrel change is all that's needed for a conversion, although an adjustable gas block might be in order, if one is going to shoot suppressed.

My friend who is so heavily invested in marketing .300 Blackout is also doing a lot of work on 6.5/.223, which, of course, also uses .223 cases. He's getting some pretty remarkable ballistics out of that round. I've told him that I just don't see the commercial application, but he's forging ahead anyhow.
 
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