300 blackout speer 125 gr tnt load.

For those of you have been playing around in loading 300 blackout, I am look for some intel. I am just getting started with loading 300 blackout. I have been reading up on the topic the past several months. And this is what I have come up with for a plinking load.

- LC converted brass I convert, and gauged with the Sheridan gauge.
- Speer 125 gr TNT
- CCI 400 SRP
- W296 starting at 17 gr
- OAL 2.050

My one question is what would be the max load for W296? I have looked up and down the World Wide Web and cannot find a lead on the max. Plus Speer doesn't have any thing published for the load.

Thx
A bomb

Semper Fi


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I dont use 296, but the Speer 125 TNT is a great bullet for the 300.

Work up in .3 increments till you start getting pressure signs.

As of right now I have been doing my metering with the Lee powder disks. With the powder disks and the W 296 it has been a challenge to make small increases. When you go up in a size on the disk it increases the 296 charge by 1.5 gr. I have been able to get it to meter charges consistently with the W296.

Now I know the powder disk isn't the best when it comes to metering, but all my loads in 45 and .223 have been in bulk, and I am looking at a bulk 300 blk plinking round not a match grade round.




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Here's some info... http://www.hodgdonreloading.com/data/rifle

With the lee double disk you have to switch both disks in order to go up small increments. For a work up you should probably load a small quantity at each weight and just use your powder scale and a funnel until the load is as you want it. Them when you find your sweet spot calculate which disks to use for production.

Excellent timing. Just bought some.

Did you find those bullets locally or order online? I'd like to get some to load on the lower end. I've only loaded 150-168 in the blackout.

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Originally Posted by balyon885

Did you find those bullets locally or order online? I'd like to get some to load on the lower end. I've only loaded 150-168 in the blackout.

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seems like I find one box each week in Casper at their sportsman warehouse.

You use it to load blackout? How you like it?

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I ended up getting the micro disk that I can adjust. Which so far it has been very consistent I throws and can be dialed in to the load I want.

I got my tnt's from Midway USA, but have been keeping my eye open for them in the Denver metro area.

I'm hope within the next month I will be able to take my work up loads out since me barrel just shipped. I'll report back. All the guys on 300blktalk have good reports for the 125 gr tnt.


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I've seen a lot of guys like them, I worked up a loads to get the gun to cycle, now I need to work on how accurate I can get the bullets I use. Look forward to seeing your report back.

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The 125 TNT is an incredibly accurate bullet. I know a lot of Benchrest for score guys shooting the wildcat 30BR have used them when their normal Berger or BiB are scarce.

It is my favorite light weight bullet in 300 Whisper. The 125 Sierra has a better BC, but it is also much more expensive.

What kind of FPS you getting hosey? Barrel length?

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Originally Posted by Limited GM

What kind of FPS you getting hosey? Barrel length?

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Max velocity 2220-2240 out of a 16 inch Rock Creek 1-14 twist using N-110 or Lil-Gun. Best accuracy around 2150.

Cool thanks.

Almost bought a box of these, Sportsman on 84th and i25 had three boxes on the shelf tonight.

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Originally Posted by balyon885

Almost bought a box of these, Sportsman on 84th and i25 had three boxes on the shelf tonight.

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Should have bought them..they are some of my favs for 300 BLK

Check the Speer 125gr tab here...
https://onedrive.live.com/redir?resi...t=file%2c.xlsx

What COAL are you guys settling on?

This is what AAC recommends for the 125 Speer based off the .250 bullet measurement.

• Speer TNT 125 1986, OAL: 2.01

Read the part at the bottom in red in the link below explaining the .250 bullet measurement. I just found this info and loaded some xtreme 150 grain flat nose using this method that most have issues cycling and initial testing is looking up, and my COAL is way under what most are recommending at the 2.000 area.

http://www.advanced-armament.com/ass...er-MiniBro.pdf

I'm using the 125 Sierra (2121), 17.9 gr W296, Tula non magnum primers, reformed Remington brass, OAL 2.21".

Feeds great from pmags, locks the bolt back, and I'm seeing sub MOA performance from an 18" Wilson 1/8 barrel. No chrono data though :/

The Sierra load data shows a max load of 18.3 gr with H110.

Thanks. Good stuff.

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With the powder disks and the W 296 it has been a challenge to make small increases.

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I have learned to use tape. run tests and find that the disk is a little too much for the load?

You measure by hand test loads then when you find what works the tape on the disks makes it repeatable. [Flower]