.300BLK load data catalog

[CJ]

Well, I decided to start a thread dedicated to .300 BLK load data since it is so difficult to find. I've some PM's lately about finding load data. A lot of the data out there literally makes no sense (same projectile, charge, vastly different velocities reported). So I'm going to post up data I've personally verified and tested.

---------------------------------------------------------
Supersonic

So, my cheap .300 BLK plinking load is as follows:

147gr FMJ M80 Surplus
15.6gr Alliant 2400
2.16" OAL
1900fps

This round has heavy recoil and it is a very hot load, from what I can find MOST supersonic velocities are around 2000-2100fps for 110gr projectiles, and I'm nearly there with a 147gr. I am the only one I can find that is using 2400 in the .300BLK, but it makes sense since it is a .44 magnum powder, which lobs 200-300gr projectiles out of a 8" barrel revolver. It only stands that 150-250gr projectiles out of a 9.5" barrel is going to be comparable. This load is extremely accurate (.34" group at 50 yards with a 9.5" barrel). I would expect 2000fps+ from a 16" barrel. So far this is the most energy I've been able to deliver with a .300 BLK load. My converted .223 cases last 3-4 reloads before the primer pockets open up and I have to get the ball bearing out. The primers are flat, but not seamless flat. There is no denying this is a hot load.

---------------------------------------------------------

I played with some subsonic loads using 2400, but it does not occupy enough case volume and is highly inconsistent and not useful. I need to try some of the cowboy powders for high volume/consistency.


---------------------------------------------------------

110gr Sierra HP
20.0gr H110
1.975" COL
2100fps estimated

This is a standard supersonic low recoil hunting load.

---------------------------------------------------------

125gr Nosler BT
19.5gr H110
2.013" OAL
2000fps estimated

This is a standard supersonic low recoil hunting load. H110 is the standard powder for supersonic loads.

---------------------------------------------------------
Subsonic

Caliber: .300 BLK
Specific: Subsonic
Powder: Alliant 2400
COL: 2.135"

chrg........1.......2......3.......4.......5

7.0gr......739...777....702....852....737

7.9gr......817...953....865....808....813

8.1gr......959...846....891....904....824

8.5gr......<Keith shot my chronograph>

So as you can see this project remained unfinished. Of course the SD will get better as the charges increase, my estimation is around 10gr of 2400 you might have a decent subsonic load here. I will revisit this again and finish my table.

*** Update 11/27/12 - Pointless endeavor, unable to cycle action at such a low weight, a heavier bullet is required for longer dwell time to cycle action. The action will start to cycle around a 200gr projectile, anything below that is a waste of time.

---------------------------------------------------------

225gr Hornady BTHP Match
11.7gr AA1680
2.16" OAL
1100fps

AA1680 is the standard subsonic powder for .300BLK. This load is for a 9.5" SBR barrel, if you're loading for a 16" barrel you would drop down to around 11.2gr. For reference the sound barrier in DFW @ 600ft elevation relative is 1130fps.

---------------------------------------------------------

220gr Nosler Partition SP
10.8 gr AA1680
2.10" OAL
1040fps



*all chrono data is taken from a 9.5" barrel.

[Nash B.]

I'm working on a handload database app for Android and program for Windows. It's still in brainstorm mode. I'm sure it's already been done, but I'm sure it hasn't been done the way I want it to be done.

[baylordjr]

Thanks CJ, this is a huge help, both by PM and thread

[CJ]

Hey no sweat, a lot of the data out there is just junk. For instance, that compiled .300blk load data thread I sent you doesn't make a whole lot of sense. Some will say the max charge is 19, and in teh same table it says 22, no sense at all.

[KBScobravert]

Hey, I replaced that chrono stantion.

If you want to chrono in the A/C bring it over to Shoot Smart and we can zing them all day long.

[CJ]

Hey, I replaced that chrono stantion.

If you want to chrono in the A/C bring it over to Shoot Smart and we can zing them all day long.

I know, I just love giving you hell in good fun. Only problem is you need to have a special accessory to shoot a chrono under fluorescent lighting which I don't have.

[ThreeFingerPete]

Lmfao @ <keith shot my chronograph >

[KBScobravert]

I know, I just love giving you hell in good fun. Only problem is you need to have a special accessory to shoot a chrono under fluorescent lighting which I don't have.

I think I remember you telling me this in the past. Sure would be nice to have though. Maybe after I get back into the paychecks and get my reloading equip set up I can add that to the list. Shoot Smart is too convenient

Lmfao @ <keith shot my chronograph >

I have been quilty of shooting a lot of things in my day but...............














yeah, I shot that fucking chrono

[CJ]

added additional info, slowly working out new loads.

[CJ]

10.8gr of AA1680 produced 1040fps, just right for a 9.5" barrel.