For hunting or plinking? It's a pretty vague question on your goals

 

If there *was* such a thing as a "standard" load it would be a 230 gn subsonic for use with a silenced SBR which is what they were designed for - clearing rooms.
Commercial rounds are either 230gn or 110 gn.
Look at the velocity of the commercial stuff and see if anyone has a load that matches.
Otherwise I say just shoot whatever floats your boat.
Almost nothing expands in bullets over 124gn in a 300 BLK. I have a couple boxes of the Rainier heavy bullets that expand but Rainier is out of business now.

 

Let's pick 30/30 for example, Winchester's standard load for 150gr PP is 34.5gr 748. What would be a STANDARD load for 300blk for a 150gr FMJ, wheather for plinking OR target OR repeling boarders?

 

I have a load for a Speer 2023 150gn
14gn 2400 for 1600 fps out of a 8" barrel.
Well within the pressure specs.
Problem with a lot of those 308 bullets is they're short and your seating depth is a little shy.
This bullet results in 2" COAL and a 1/4" seat depth. Works in mine but no guarantees on anything else since it depends on your feed ramp.

Hornady 3037 a boattail you can get COAL 2.260
I have a load with 17.5 gn of Li'l Gun for 1700 fps
My notes say 100% burn in an 8" barrel.
18 gn Lovex D063 only gives 1600 fps and not a clean burn in 8"
20 gn AA1680 also only 1600 fps and a nasty burn.
14.5 AA#9 - 1600 fps very clean burn
I did try a load of H110 - 18.5 gn = 1700 fps and my notes say "hot".
So my money is still on good ol 2400 or Li'l Gun
Oh - I also tried 13 gn of Blue Dot and it shot nice at 1600 fps

 

Rifle or pistol??

 

Doesn't matter - the 300 BLK was designed to reach maximum velocity in an 8" barrel.
A 16" gives a slight boost but not enough to worry about.

 

18 grains of H110 is pretty "standard" for 125 grrain Hornady SST bullets. Which is a good bullet for hunting and self defense. But it's too expensive for plinking. The two other "standard" bullets for hunting are Barnes 110 grain(forget which on) and Speer 150 grain Gold Dot. All too much for plinking. For plinking it would be Sierra TNT or some military factory pulls. Powder is whatever. Also if any powder is "standard" for the 30-30 its IMR 3031

 

I shoot 17.5 grs of win 296 with a 125 gr nosler BT in a rem md 7 aac with a 16 'barrel at a little over 2100 fps, my friend shoots little gun with the same bullet at 2200 fps. we both have killed deer with them.

 

For supersonics try H110 or W296, Lil Gun is not a good idea for autos. I like Sierra 135 gr. varminteer, magnum primers, and a good crimp. Take actual load from trusted source!

 

sindbad, know what you mean about Lil Gun. Tried that powder ONCE with 150gr FMJ's using SPEER load data and blew out the primer. So going with H110, 296 and A1680. Currently have my AR sighted in at 100yds with 6gr Trail Boss using Sierra 150gr JSP. Sure, it's a REALLY light load that doesn't even bump the bolt and doesn't have the velocity to expand, but at that range whatever I hit with it won't know it's coming! ;-)

 

Say whut?
If you blew out a primer with Li'l Gun you either overcharged it or had a loose pocket.
Li'l Gun is close to 2400 in charges but it burns a little hotter and builds pressure slower at ignition which really gives a good boost to heavy bullets.

As far as the 300 BLK I'd stick with powders in the middle fast range like AA#9, 300MP (or whatever they call it these days) Lovex D063
Subsonic AA1680, 5744 for subsonic heavy bullets 200+ gn

 

I am not going for the sub sonic effect, but my normal load is 17.5 gr IMR-4227 with a 125 gr. Sierra Spitzer for 2000 fps and 7/8" group at 100 yd

I quit working with other powders as this was good enough for an old man with bad eyes (that's why most of rifles are topped with optics these days)

FYI for you younger cowboys, go ahead and buy that higher magnification scope, I promise your eyes will grow into it, ( I used to buy 4 & 6x scopes, over the past few years they were replaced with higher magnification models)

 

Bubbajon, Thanks. I have been kinda leaning towards 2400 myself. Will check out those loads.
I was trying for 1900fps with the Li'l Gun load out of the Speer manual, which I guess was a bit too much, hence the blown primer.

 

Wow - that had to be in the red pressure wise. 1900 fps is probably unobtainable with a 150 gn bullet. Maybe in a long barrel with a longer burning powder.
I wonder if TS is on to something with his IMR4227 load.

 

Hill Country Shooter, know what you mean about the eyes. I have a Weaver 3.8-12X44MM on my 300blk. BTW, it's a 16" AR Stoner with a side pull bolt.

 

It's been a while since I have reloaded 300BLK, thanks to the events of last March, but on that day I was at the range testing loads for a 155gn projectile https://frontierbullets.co.za/?product=cmj-30-cal-155gr-spitzer-flat-base
I was using ADI AR2205 (repackaged W296 more or less). I forget the load without referral to my records, but it was nicely accurate at 50m.

 

with the blackout in an ar15 overall length is important for reliable feeding. Since case capacity is very limited to start with variations in case length with the same overall length can cause dramatic pressure spikes. Also without a decent crimp the bullet could be set back in case with impact of m4 feed lips or contact with end of magazine. Most bullets currently offered in .30 cal will not reliably expand at blackout velocities. Varmint bullets that would normally have explosive expansion results in another .30 caliber rifle may have satisfactory results for you? 30/30 bullets might be another choice if they will feed properly for you?

 

30-30 bullets have some shorties as well. I've even shot some AK bullets with success although I size them first.
Almost without exception you'll need to find a boattail spitzer to fit properly.
Case volume, powder and bullet weight are what impact pressure. As long as your seating depth is consistent you're unlikely to get wild variations.
That's why I mentioned that one bullet was short and how deep I set it.
COAL is a real PITA on most 300 BLK uppers because there's a lip in the feed that at minimum will scratch the bullet. Short COAL the tip can actually hang unless it has a steep ogive.
I stoned mine smooth so I don't have as much issue with shorties. It also means I have to be careful stacking them in the mag.
I make my own brass out of 223. I have a gauge that checks all the parameters because proper case size is pretty important.
oh, well - I don't use them as a matter of course I just found a couple boxes on clearance at the LGS.
What I need is a 30-30 - yeah that's it! Can't let them clearance boolits go to waste!

 

BubbaJon, just checked Hornady #10 manual and found 13.2gr 2400 max load for 150gr bullets. If I do go your 14gr 2400, I'm gonna do so REAL slow!!!!!!! Thanks for the heads up on the A1680 powder. Actually, my reason for going with the 300blk is to kinda replicate 30 carbine loads to maybe 2200fps for defense loads out of the AR using the Speer 110JHP. Also kinda like the idea of using the Sierra 110JHP for the same and maybe coyotes if I get the chance at them.

 

Probably the best bullet for self defense would be 125 SST. Frangible at close range and expands out to 200 yards or so.

 

So far no one has mentioned Hodgdon CFE BLK? I bought a pound, but I have not had a chance to try it. Supposed to burn very clean.

 

I have a pound and have not tried it either.

 

I'm a bit curious about that, too. Maybe because it's still kinda new? The Hodgdon website shows loads for 110gr on up to 230gr, with only one load for 208gr to 230gr, all subsonic. I'm just gonna HAVE to try that one! Thanks, sindbad.
JUST loaded up 10rds Hodgdon starting load of 22.5gr CFE BLK with Speer 110JHP. Will let you guys know in a few days how it does.

 

Thanks Bryan Alder: forgot about Shooter's World Powders. When I looked at their website they show another powder for the .300 aac blackout. The powder is SOCOM rifle powder. This looks promising. I will have to see if I can find some locally to avoid paying hazmat fees.

 

I FINALLY got around to working up a load for my 300 blk AR! Been having some problems with it cycleing, so took it to the local gunsmith where he installed an adjustable gas block, he figured that the original wasn't lined up right with the gas port. Now it's running just great with whatever I load in it. Anyway, the most accurate load so far is 19gr H110 with the Sierra 110 HP Varminter bullet, 'bout an inch and a half at 100yds! :adore::dancing2:arty: