300 BLK...

[IdahoSharpshooter]

I recently came into a couple bulk boxes of 190gr SMK's.

Anybody got any experience with them or loading data you'd care to share?

thanks,

Rich

 

[Sheldon N]

For 300BO subs? I'm doing the same thing, but with 200g SMK's. After some research I settled on Accurate 1680 as a good choice for powder... just need to wait for my can to get out of NFA jail to start load development. Seems like 10-11g is the number most people talk about.

 

[mic2377]

If this in an AR-15, then AA-1680 is the standard, between 10.3 and 11.0 gr depending on gas system and barrel length, and this will generally cycle the action. I have not loaded the SMK's but shot many 190 gr Nosler CC's. I don't recall the OAL, but 10.4 gr was subsonic and ran great in my 16" pistol-gas Noveske.

I have also used H4198 and RL7 with good success.

If you are running a bolt gun, want it to be really quiet, or don't care about cycling, use a faster powder.

 

[rifleman700]

Depending on your case capacity 11 grains AA1680 only gives you 65% case fill which is a little low and may lead to inconsistent performance. And with 11 grains you are only burning 75% of your powder so if you like big fireballs this will be the ticket. You can still go with a slower powder and still be subsonic and be around 85% fill ratio. 220's are best when running subsonic IMO.

 

[rebel]

The 190's shoot very well subsonic. I loaded for a 16 inch carbine gassed AR. I loaded 10.5 gr N120 with an OAL around 2.15. In playing with seating depth I achieved 1040 FPS. In my cases the bullet was just on the powder.

 

[Sniper338]

Im about to get to this... waiting on parts to come in..

 

[rebel]

Im about to get to this... waiting on parts to come in..

Great info here. http://www.300blktalk.com/forum/index.php

 

[rifleman700]

The 190's shoot very well subsonic. I loaded for a 16 inch carbine gassed AR. I loaded 10.5 gr N120 with an OAL around 2.15. In playing with seating depth I achieved 1040 FPS. In my cases the bullet was just on the powder.

81% fill ratio and 85% powder burned for this load - QL prediction with 16" bbl. I like this much better!!

 

[rebel]

81% fill ratio and 85% powder burned for this load - QL prediction with 16" bbl. I like this much better!!

I don't have QL, but have a friend that does! I use the 190 smks to figure a load for the 194 Lehigh. N120 burns alot cleaner. A1680 is a go to for AR shooters because it works, lots of gas to operate the system. But God is it dirty. If you load heavy supers with it, compressed, it really becomes a different powder.

 

[Geno C]

I use h110 and lil gun with 220s in mine. I use a savage single shot that is surprisingly accurate and an ar with the gas shut off and a side charge handle. I don't know how it works for cycling

 

[Coleridge]

I've been shooting 208 Amax in a bolt gun with 8.1gr of Lil Gun with good results. I had heard that subs really just don't shoot well but I have had good luck (not benchrest accurracy but usually always under an inch at 100 yards). Just got some of the Maker Rex bullets to shoot a few deer (sub'd) and had to come all the way down to 7.4gr to get below the speed of sound consistently (not sure if the different bearing surface, softer material or what caused the faster speed). They shot dang near as good as the Amax & will open down to ~600 fps. In the 900-1100 fps range they open to around 1" in diameter. Should work on pesky deer.

 

[Canadian bushman]

I ran the 240 smks with h110. Ridiculosly low es. I couldnt believe it sometimes. Had to of been a fluke.

 

[rebel]

I've been shooting 208 Amax in a bolt gun with 8.1gr of Lil Gun with good results. I had heard that subs really just don't shoot well but I have had good luck (not benchrest accurracy but usually always under an inch at 100 yards). Just got some of the Maker Rex bullets to shoot a few deer (sub'd) and had to come all the way down to 7.4gr to get below the speed of sound consistently (not sure if the different bearing surface, softer material or what caused the faster speed). They shot dang near as good as the Amax & will open down to ~600 fps. In the 900-1100 fps range they open to around 1" in diameter. Should work on pesky deer.

Paul makes a great bullet. He has both sub and super designs for 300 BLK. If you have a single shot or bolt action, try his 100 grain load with 5 gr. of trailboss. Suppressed your can hear the firing pin hit and the impact on target. I use these for smaller game and pests.

 

[IdahoSharpshooter]

Thanks, I should have mentioned that it is a pistol AR with an 11" barrel. It also has a YHM Cobra II suppressor.

I have been playing with 250gr case gas checked bullets at about 1060+/- fps.