Supersonic 300 BO

[gundoctor]

I'm looking for supersonic 300 BO loading data using powder coated 230 gr Lee boolits.
I'm interested mostly in AA1680 & Hodgen LIL-gun powders.
All the loading manuals I have, only list subsonic 300 BO loads using heavy boolits & that's a shame because 200 gr+ supersonic loads will make a great medium range load for larger pigs. The lighter projectiles can be a little lacking in penetration.

And since I not going to spend the time & money to obtain a can, why worry about sonic booms.

[ohen cepel]

Quick look at Hodgdon online, and from what I know of loading 300BLK, I don't think you're going to get much over subsonic with that weight in a BLK. I don't think there is enough case capacity nor room on the pressure curve to push a 230 that fast in that cartridge.

[gundoctor]

Quick look at Hodgdon online, and from what I know of loading 300BLK, I don't think you're going to get much over subsonic with that weight in a BLK. I don't think there is enough case capacity nor room on the pressure curve to push a 230 that fast in that cartridge.

Some years ago, Accurate listed a jacketed 230 gr bullet load that was supersonic. I tried that load with cast lead & it generates a little over 1300 f/s in my AR. It also is not a compressed load.
& since cast lead generally runs a little lower pressure & higher velocity than jacketed, with the same powder charge, I'm wondering if there is more that can be wrung out of the load.
If no one has any answers, I guess I'll have to go back to the way I've done it for the last 50+ years.

As J.W. Hornady once told me, "If you're getting good brass life, You're not running too much pressure"

[imashooter2]

Sierra lists a supersonic load for their 240 grain jacketed. I’d be comfortable working up. You’ll have to decide for yourself.
https://sierrabullets.files.wordpress.com/2017/12/300-aac-blackout-03052018.pdf

[gundoctor]

Sierra lists a supersonic load for their 240 grain jacketed. I’d be comfortable working up. You’ll have to decide for yourself.
https://sierrabullets.files.wordpress.com/2017/12/300-aac-blackout-03052018.pdf

Thank you very much. That's exactly what I was looking for.
Now, it shouldn't take near as many rounds to find out where the safe max in my rifle is & with all this panic buying that's going on, working up loads can make it hard to replace what was used up.

[Texas by God]

Will a 230 grain .308" cast bullet at 1300 fps outpenetrate a 150 grain cast at 1800 fps in meat? Let us know.

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[beltfed]

Compromise:
15.5 IMR 4227 under 311334- 190 gr 9+1 or 311299-200gr COWW/Lino. Supersonic, runs my AR well.
Have not run it across my Oehler 33 yet.
beltfed/arnie

[gundoctor]

Will a 230 grain .308" cast bullet at 1300 fps outpenetrate a 150 grain cast at 1800 fps in meat? Let us know.

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I can't say for sure, if a 230 grain .308 @ 1300f/s would out penetrate a 150 grain .308 @ 1800f/s, because I've never had the opportunity to compare them directly.
What I can say is that a 230 grain .308 bullet has a SD of .346, which is about the same as a 500 grain .458 (.341SD).
As I was taught in the ballistics& handloading class I took back in 72, bullets of similar SD @ similar velocities have similar depth of penetration, as long as they are constructed of the same material. No matter if they are of different diameters.
I don't think a 150 grain .308 @ 1800f/s would be up to the same job. BUT that's just my opinion for, what its worth.

[Texas by God]

Good explanation, thanks. I remember Ross Seyfried in a G&A article stating that the over .300 sectional density were " superstars" for penetration on bigger than deer animals.
Some folks only think of SD as Standard Deviation.

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[gundoctor]

Will a 230 grain .308" cast bullet at 1300 fps outpenetrate a 150 grain cast at 1800 fps in meat? Let us know.

Sent from my SM-A716U using Tapatalk

I did some playing with a ballistic program & think I've got a better answer for your question.
The picture shows the velocity for the 230 grain Lee cast boolit @ 1700 f/s compared to a round nosed 150 grain jacketed bullet(it was easier to find than a cast boolit) @ 1800 f/s.
The sectional density on the two are 230 gr .346 & 150 gr .226.
So I still say the 150 gr 30 cal just aint in the same class as far as penetration.

[Texas by God]

I see what you mean. For hogs or deer I would definitely want a flat nose cast bullet regardless of the weight, though.

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[gundoctor]

For hunting loads, I employ one of these. https://www.midwayusa.com/product/1012693841?pid=371968
With a fairly soft alloy, it provides enough expansion to remedy any energy transfer issues, while still maintaining the high BC & SD.
I've been doing a 1/8 X .250 deep HP on this bullet for several years with the 1300 f/s load & 100 yd groups run about 1.5 MOA. The 100 lb doe I took with that load year before last, @ 40yd, had a 1" exit wound & collapsed when the boolit hit her..
I also have the 1/16" hp version that I use on Lyman 356402 & shoot in my 9mm KelTec sub2K
The only thing I don't like about the Forester set up, is it only works if you load the boolit in the case first. That makes determining how much weight is remove from the boolit a little difficult, unless I weigh the loaded round before & after drilling out the HP & that slows production.