Playing with fire

[ray1970]

So, I can't find reliable data for what I want to load so I am going to make it up on my own.

Hope I don't kill myself.

I'm trying to load some 150gr bullets for my .300 Blackout. Maybe some 168gr as well. I have data for lighter and heavier bullets so I am making a little graph with those weights and charges and going to fill in the blanks. Hopefully the pressure curve is pretty linear. Looks like I will probably try 16.0gr of 296 with the 150gr bullets and maybe 14.0gr with the 168gr bullets.

Wish me luck.

[Beer]

[20X11]

Good Luck!!!...when /if you survive, please share the data. Also, have you checked the 300blktalk forum Handloading section?

[ray1970]

Also, have you checked the 300blktalk forum Handloading section?

A little bit. But you can't always believe everything you read on the Internet. I think I'm pretty close to what those guys were saying worked for them.

We'll see.

[DFBrews]

I run H110 with my milsurp pull downs... 17 grains I believe

[DSB OUTDOORS]

I've been loading 12.5 grains of VIT N-110 with a 200 gr Sierra Matchking. Talk about a Zinger.

[DFBrews]

I've been loading 12.5 grains of VIT N-110 with a 200 gr Sierra Matchking. Talk about a Zinger.All 850 fps of it.

[dwalker460]

I had some load data for 150gr 300, will have to dig it up

[DSB OUTDOORS]

All 850 fps of it.
Did you chrono it? I didn't but it shot through a 15" log at 40 feet and ricocheted somewhere at a high rate of speed. [Coffee]

[Colorado Osprey]

Looks like somebody else had the same thought.
http://www.beyond556.com/bboard/showthread.php?6232-irritated-by-the-300-blackout-ammo-situation
"im getting good results with 150 grain seirra flat base game kings loaded over 16.50 grains of 296 and a winchester small rifle primer and an OAL of 2.050"

That data looks a little hot. (pressure spike) If you are trying to get a high velocity (relative) cartridge with 150-168's you might get away from pistol/shotgun style powders and look into something a little slower burning like 2015, 4198, 335 and powders used in the original "Fireball" size cartridge. That is the way they got best velocity with cartridges like the 7mmTCU and heavy bullets for silhouette shooting without going sub-sonic.

[dwalker460]

Pretty sure my 150gr load is for H-110 or maybe Tac, I will dig it up and see.

[DSB OUTDOORS]

All 850 fps of it.
The data I have for 200 gr sierra Matchking using VIT N-110 should be about 1,300 FPS, sorry Ray no data as of yet for the 296 powder. I'll keep looking.

[Zombie Steve]

I don't know the first thing about 300 Blackout, but I do know pressure curves aren't linear.

Assuming the bullet is fairly close in shape / bearing surface and all other factors are similar (oal, primer, not using IMI crazy thick brass, et cetera), you can always use data for heavier bullets and potentially take it a little higher. More often than not, your most accurate load won't be at max anyway.

Go slow, work up carefully checking for pressure signs (not just primers flattening). You'll be fine.

Once you get outside things that have been mapped out for 30 years, it really gets interesting. I've loaded some oddball lead profiles and some rifle bullets way longer than they should be for the weight, and it does make you want to cup and turn before you touch off the first one. Again, just always approach it with some common sense and error on the side of caution, and you'll be fine.

[ray1970]

I'm not interested in achieving top velocity here. Just looking for some affordable plinking rounds. They do need to reliably cycle the action though.

With powder and bullets a little hard to come by right now I'd rather not waste a bunch of it experimenting or working up a reliable load.

[ray1970]

I run H110 with my milsurp pull downs... 17 grains I believe

So my guestimation of 16 or 16.5 might be reasonable. I have some pulled 147gr projectiles as well as some Hornady 150gr.

[JM Ver. 2.0]

Did you chrono it? I didn't but it shot through a 15" log at 40 feet and ricocheted somewhere at a high rate of speed. [Coffee]

I laughed a lot. You crazy bastard. Lol.

**I'm a Buddhist Monk and I approve this message.**

[ray1970]

Ha. I forgot I have some older reloading manuals stashed away. Found quite a bit of data for .300 Whisper. Think I'll use that info and go from there.

Loaded up some 147 and 150gr stuff yesterday. Might try to get some 168gr loads put together this evening.