Powder? Loading 300BLK Subsonic

[Rivardo]

I picked up a Remington 700 in 300 Blackout. I have no idea what powder to use. I'm gonna use medium-heavy cast bullets at subsonic velocities.

 

[hoytcanon]

See is you can find some CFE-BLK... it is proving to be fast and accurate in the 300 BLK and 7.62X39... are you planning on using light or heavy bullets for your subsonic loads?

 

[Paulinski]

As mentioned aboce CFE-BLK or AA1680.

When I had my LMT AR I was loading 10.2gr of AA1680 - nice and quiet never had any issues cycling and hold open on empty.

With you having a bolt gun you can go even lower powder charge.

Its a fun caliber fo-sho

 

[Ganderite]

2400 has been my go to powder for sub sonic. It is not position sensitive.

 

[Receipt]

4198 has worked well for myself.

 

[Rivardo]

See is you can find some CFE-BLK... it is proving to be fast and accurate in the 300 BLK and 7.62X39... are you planning on using light or heavy bullets for your subsonic loads?

lee 230gr cast

 

[Rivardo]

2400 has been my go to powder for sub sonic. It is not position sensitive.

I was looking at noslers data and notices 2400 was good for subs and supers

 

[MuthaFunk]

Canada Ammo's D4198 would be a cheap option as well.

For 210gr cast rifle loads in 7.62X39 I'll use 10 Gr UNIQUE and get ~ 1400 fps. If you went lighter sayyyy 8 gr you could be subsonic. UNIQUE is very easy to light so small charges work great with it.

 

[hoytcanon]

Hodgdon Website

CARTRIDGE - 300 AAC BLACKOUT
Bullet - 230 grain

Your search returned#7 loads.

Case:#Hornady

Twist:#1:8"

Primer:#Remington 7 1/2, Small Rifle Magnum

Barrel Length:#16"

Trim Length:#1.363"

Powder - IMR 4198

Bullet Diameter - .308"

C.O.L. - 2.260"

Grains - 10.8

Velocity (ft/s)1,062

Pressure27,900 PSI

Powder - CFE BLK

Bullet Diameter.308"

C.O.L.2.260"

Maximum Load

Grains - 11.3

Velocity - 1045 fps

Powder - H4198

Bullet Diameter.308"

C.O.L.2.260"

Maximum Load

Grains - 10.8

Velocity (ft/s)1,066

Pressure - 26,600 PSI

Powder - IMR 4227

Bullet Diameter.308"

C.O.L. - 2.260"

Grains - 9.6

Velocity - 1046 fps

Powder - 296

Bullet Diameter.308"

C.O.L. - 2.260"

Grains - 9.0

Velocity (ft/s) 1,058

Powder - H110

Bullet Diameter.308"

C.O.L.2.260"

Starting Load

Grains

Velocity (ft/s) - 1058

Pressure

Maximum Load

Grains - 9.0

Velocity (ft/s) - 1,058

Powder - Lil'Gun

Bullet Diameter.308"

C.O.L.2.260"

Grains - 8.2

Velocity (ft/s) - 1,068

Pressure - 30,000 PSI

 

[cr5]

I use A1680 for my 208gr subsonic loads.
I also have a load with Trailboss and 150gr pills that it a fun subsonic load in a bolt action.
Bolt action really opens up your options once you don't have to worry about cycling the action of a semi auto.
Buy a new Hornady manual and check the Hodgdon website. There's also quite a bit of data on the internet forums if you search around for it, just be careful with other peoples loads.

Here's some data that I found a while back (before there was much published data).
http://www.xcr.ca/CustomReloadingData.numbers.pdf

 

[todbartell]

I used H110 in my 300AAC subsonics with 225gr Hornady BTHP

 

[Rivardo]

I used H110 in my 300AAC subsonics with 225gr Hornady BTHP

H110 seems like a popular powder for the 300blk kinda like varget for 223/308

 

[todbartell]

It worked well too with supersonic 110gr - 125gr loads

 

[Rivardo]

It worked well too with supersonic 110gr - 125gr loads

Good stuff to know thanks. What heavy bullets are you using?

 

[todbartell]

I sold the rifle but was loading the 225gr Hornady BTHP