What sort of Can for a .300 BLK AR-15?

[Jamoy1993]

Hi folks, so ive got a variation pretty much done for a modular 300 blackout upper receiver, barrel and bolt for my current AR-15 in .223/5.56

I want to toy around with sub sonic cast rounds. I have done the math and i can load a single round for about 20 pence a shot (Primer and Powder), ive got loads of brass and lead for free.

I am looking at getting a HQS Slim X, but it says the max rounds per minuite they reccomend is 6 (Which is pretty pants as i do practical shooting and want to use this at ranges where i do this with energy restrictions, maybe 20 - 30 rounds in quick succession dependant on course).

I need something that fits the following criteria:

About 300 quid new
Able to deal with semi automatic fire / doesnt reccomend sticking to 6 rounds / min
Has to be uniformly cylindrical (I am autistic about how cans look )
Black
Has to be about 40mm in diameter, i am going for a tucked suppressor look like the honey badger. I got the Midwest Industries SP Series 15" MLOK Rail over a 12.5 barrel.
Threads 5/8x24UNEF

 

[Jamoy1993]

Further research:

ASE Jet Z Compact will do the trick, 120 quid more but seems reasonable. Nominal Diameter of 40mm.

 

[Greenmist]

I have a Jet Z compact on mine, does the job well. Although mines a bolt action, where are you shooting a semi auto? (not jealous at all)

 

[wytonpjs]

Oceania Defence - several threads running mentioning them currently. If you want full auto, go for the inconel version

 

[Jamoy1993]

I have a Jet Z compact on mine, does the job well. Although mines a bolt action, where are you shooting a semi auto? (not jealous at all)

I wish lol. It will be a straight pull. Can probably get 2-3 shots off per second so it will get fairly hot quick!

 

[Jamoy1993]

Oceania Defence - several threads running mentioning them currently. If you want full auto, go for the inconel version

Il have a look, thanks!

 

[jthyttin]

It's not clear which rounds (sub or super) you're going to shoot stages with. If sub, you don't need to consider those round limitations.

That said, it's usually not a good idea to shoot a lot of (exposed) lead bullets through mod. There will be a lot of "stuff" including metallic lead, that will "condensate" (in lack of better word) inside the mod. Gas check might help some. Btw you probably want some kind of expander die to assist seating lead bullets w/o damaging the base.

I'm also somewhat curious, what kind of straightpull if you get up to 3rds per second (assuming shooting unsupported)...

 

[Jamoy1993]

It's not clear which rounds (sub or super) you're going to shoot stages with. If sub, you don't need to consider those round limitations.

That said, it's usually not a good idea to shoot a lot of (exposed) lead bullets through mod. There will be a lot of "stuff" including metallic lead, that will "condensate" (in lack of better word) inside the mod. Gas check might help some. Btw you probably want some kind of expander die to assist seating lead bullets w/o damaging the base.

I'm also somewhat curious, what kind of straightpull if you get up to 3rds per second (assuming shooting unsupported)...

Ofc shooting supported, i have an sgc with ambi cocking. I can probably get 2 per sec off un-supported. Wished they didnt knee jerk ban the lever release or mars actions...

I will be hardening my lead sufficiently with some antimony and will not be using checks with my bullets as im going to use a lee 230-5r mold which does not need checks. I also do not want to have a check come off in the can.

I beleive If the lead is sufficiently hard it will minimise leading, i may also consider coating. Initially i will use an allox coating. Ideally i would like a serviceable can so i van clean it if it becomes too leaded. However people in the states say they have shot thousands of lead cast in their cans with no issues.

 

[jthyttin]

I would weigh the can periodically and keep track of measurements. Using slowest possible powder might also help minimize the leading.

 

[Jamoy1993]

I would weigh the can periodically and keep track of measurements. Using slowest possible powder might also help minimize the leading.

Good advice I might also invest in an ultra sonic cleaner. As for powder thats the route i have taken. I think ive settled on VV N110 and it will produce circa 18k PSI according to GRT. This appears to be the slowest powder recommended for 300 blackout from Vihtavuori. I was originally going to use VV N310 as i load a 12 gauge slug using that that works very well in my M2 but the pressure would be way higher and require harder lead, more heat and more leading.

Load comes out to ~ 8.5 Grains of N-110 which should land me about 1000 FPS. This is based on Hornady load data straight from their manual.

I really only intend on shooting sub sonics with cast lead, anything super will be FMJ as well.

 

[Ginc]

I use the Silent Steel Compact Flow Suppressor. It's full-auto rated and has performed without any issues so far, except for the weight.

 

[Jamoy1993]

I use the Silent Steel Compact Flow Suppressor. It's full-auto rated and has performed without any issues so far, except for the weight.

That looks delicious. Whats the overall diameter of this suppressor and its cost please?

 

[Ginc]

42mm It cost me about 700EUR, for suppressor and muzzle brake with QD mount.

 

[Jamoy1993]

42mm It cost me about 700EUR, for suppressor and muzzle brake with QD mount.

Shame, wont fit my handguard. Its a nice one though.

Edit: Ive actually managed to change my order to a shorter handguard. This is a ballache trying to get mods that will fit it. Now my rail is 10.25 inch over a 12.5 barrel. Should be easier to get a decent moderator now.

 

[Ginc]

Yes, its way better to keep the muzzle outside the handguard, than struggle while fitting muzzle devices. My setup is a little bit to tight, no place for other type of QD system.

 

[Jamoy1993]

Yes, its way better to keep the muzzle outside the handguard, than struggle while fitting muzzle devices.

I mean, it would have been very sexy. Was going for that honey badger look. I considered if i was using it for practical shooting too, the beeper we have does not register suppressed shots so it would be good to remove it for competitions too.

 

[jthyttin]

I doubt you get any benefit from flow-through design on straightpull. And the (moderation / suppression) performance is not very good, so basically very small and light "traditional" mod will equal them.

Regarding subsonic performance, there are very few if any commercial designs available in Europe / UK that are optimized for subsonic or especially subsonic 30cal centerfire. If you can special order different A-Tec models, there's at least few off-the-shelf models worth considering (Optima 40 and AR 40-3). Those should be supersonic optimized. All AU Jet-Z models are out of production so you'd be limited to what you can get on the shelf in UK.

 

[Ginc]

I shot subsonic 308win with Hausken JD224 suppressor. No problems, and this setup produces minimal amount of heat using 8,7gr N320 pistol powder per shot.

 

[Jamoy1993]

I doubt you get any benefit from flow-through design on straightpull. And the (moderation / suppression) performance is not very good, so basically very small and light "traditional" mod will equal them.

Regarding subsonic performance, there are very few if any commercial designs available in Europe / UK that are optimized for subsonic or especially subsonic 30cal centerfire. If you can special order different A-Tec models, there's at least few off-the-shelf models worth considering (Optima 40 and AR 40-3). Those should be supersonic optimized. All AU Jet-Z models are out of production so you'd be limited to what you can get on the shelf in UK.

I guess its not paramount i have optimal efficiency as i do intend on sharing this mod with my 308 bolt action. So if i can get something that is "decent" i will be happy.

That is a bummer about the Jet's

I shot subsonic 308win with Hausken JD224 suppressor. No problems, and this setup produces minimal amount of heat using 8,7gr N320 pistol powder per shot.

Il need to have a look at that. And nice, i did consider N320 as well. I am trying to keep the pressure spikes as low as possible so i can get away with having slightly softer lead. The scary part with the pistol powder and the 230 grain bullets is the load ratio is sometimes below 50% which i dont want to tempt fate with a potential double load as i am still relatively new to reloading (1.5 years)

 

[jthyttin]

N320 is only marginally slower than N310. Cannot see the benefit of heavy lead bullets in straightpull. Lead is very forgiving in the MV department, and unless you need extra momentum for fullsize poppers or something, just choose something in 123-165gr that feeds nicely.