At the cost of more flash and blast indoors. Same reason I would not choose a .357 Mag indoors.
.300 blk out question
- Thread starter CANNONMAN
- Start date
- Status
CraigC
Sixgun Nut
The 7.62x39's twist rate can stabilize bullets 200gr and heavier? News to me. The 7.62x39's +200gr bullets expand at subsonic velocities? News to me. In fact, neither are true. The standard 7.62x39 twist does not stabilize heavy bullets and heavy bullets do not expand out of it.
CoalTrain49
Member
As nearly as I can tell from looking at a reloading manual it's about equivalent to a 30 carbine. It moves a 110 grain bullet at about the same velocity (maybe a few hundred fps faster with some powders) as a 30 carbine. The 30 Carbine was designed around 2000 fps using an 18" barrel. About the only difference that jumps out for me is the twist rate of the barrels. Because the 330 BLK was designed for heavier bullets the twist rate is much faster. 7.7 compared to 16.
I'm thinking not many people have shot an M1 carbine. It acts like a pistol cartridge in a rifle. It's a tweener.
I'm still looking at 300 BLK as a cartridge for a bolt rifle. The only problem it seems is not many build a rifle for that cartridge. Ruger and Remington, that's about it. Neither would be my first choice in a bolt rifle.
I'm thinking not many people have shot an M1 carbine. It acts like a pistol cartridge in a rifle. It's a tweener.
I'm still looking at 300 BLK as a cartridge for a bolt rifle. The only problem it seems is not many build a rifle for that cartridge. Ruger and Remington, that's about it. Neither would be my first choice in a bolt rifle.
Last edited:
CoalTrain49
Member
Sounds right to me.
Looks like 150 is about max for 7.62x39. Hornady manual doesn't list anything heavier than that. If Hornady won't make a bullet than there is probably a good reason for it.
Gordon
Member
I got into .300 Blk late in the game a couple years ago because the 5.56 pretty much did what I wanted and was cheap to shoot. Then my son started shooting it from a 8" pistol and a 16" switch barrel AR . He gets 2300+ Fps from 115 grain loads in the 16" and about 2000 fps from the pistol . These were impressive numbers to me after I found my short Noveske Infidel got about 2400fps with the 77 grain load so touted about . So I jumped on the bandwagon with a 10" .300 upper and it does get about 2100fps with 110-115 grain loads . These are OK for the smaller deer we see where I hunt to 200 yards or so which is as far as most shots are. Same for my son and it is why he started shooting it. FWIW 16" OAL barreled rifles or 10" pistols fit into the saddle bags of a Cruiser type motorcycle and this is why we have them ! 5.56 is more like a .22 Hornet with shorter barrels , it can do it, but the .30 is MUCH better for medium game.
CraigC
Sixgun Nut
It's more than just twist rate but also cartridge overall length and case capacity. Out of rifle length barrels, the .300 moves out a good bit faster than the .30Carbine with 40% more powder and a more slippery bullet. The .30 ends where the .300 begins. What the .30 does with a 100gr, the .300 does with a 150gr.
Barrel swapping isn't really a big deal. Any gunsmith can turn one from a blank easily. 1:8 is a pretty nice compromise for most loads between 123 and 180gr, including subsonics. Even 200-grainers, which aren't that uncommon in .303 British and 7.62x54R catalogs, even though I'd choose a much larger straight-walled caliber and far heavier bullets for any serious subsonic application. Dual purpose subsonic / full power caliber is always a compromise; when you bow to one direction you moon to the other, as they say.
Gordon
Member
I believe the .300 operates at 10,000 psi higher pressures than the .30US carbine does
Varminterror
Member
- Joined
- Jul 17, 2016
- Messages
- 14,893
I started shooting the “blackout” in either ‘97 or ‘98, long before AAC got wind of the idea. Over those years, I’ve seen all of those simple comparisons made - it’s basically a 30-30, it’s basically an x39, it’s nothing more than a hot 30 Carbine... In my experience, it’s none of those. The nuances among all of them are sufficiently insurmountable for such generalizations.
The most popular statements in recent years don’t make any more sense than these above - there’s a LOT of silliness passed around as “it’s the best at ________.” At either end of the spectrum, until you restrict the statement with a bunch of modifiers like saying “it’s best at _______ while still using standard mags and bolts,” it’s not really “best” at anything.
Nothing really wrong with it, and I do enjoy shooting it among a fleet of other cartridges in the AR, but it’s a long way from being “best” by any measure.
The most popular statements in recent years don’t make any more sense than these above - there’s a LOT of silliness passed around as “it’s the best at ________.” At either end of the spectrum, until you restrict the statement with a bunch of modifiers like saying “it’s best at _______ while still using standard mags and bolts,” it’s not really “best” at anything.
Nothing really wrong with it, and I do enjoy shooting it among a fleet of other cartridges in the AR, but it’s a long way from being “best” by any measure.
CraigC
Sixgun Nut
The cartridge is truly a study in compromises but it works well if you can use what it offers. Probably the only thing it's "best" at is subsonic use in the AR platform.
GunnyUSMC
Member
I’m not a fan of the 300 BO.
Here is one reason. This guy mixed up his ammo and fired a 300 BO in his 556.
I wanted a little more down range performance for shooting deer and hogs out to 250 yds.
So I went with the .277 Wolverine.
Where I hunt I don’t need something that will get me to 400 or 600 yds or more, but I need more then 150 yds.
Here is one reason. This guy mixed up his ammo and fired a 300 BO in his 556.
I wanted a little more down range performance for shooting deer and hogs out to 250 yds.
So I went with the .277 Wolverine.
Where I hunt I don’t need something that will get me to 400 or 600 yds or more, but I need more then 150 yds.
CoalTrain49
Member
I would probably still get it mixed up.
I used to load pretty hot for a 357 rifle. I always worried about mixing those with my model 19 ammo. I just sold the rifle and tore the ammo down. Problem solved.
CoalTrain49
Member
I have several .223's. Maybe I better look for a fatter case.
Demi-human
maybe likes firearms a little bit…
A Thirty- Four Fifty Bushmaster maybe? Also known as the Three Oh Bushout. It's for all those worn out Four Fifty cases that litter the ground at every range.
My SKS will stabilize 174 smks @ 1600 or 1700 (I think, I'd have to go dig thru my Magspeed data). Loads barely cycled my action tho....I'm also not actually sure what the twist rate is.
Also didn't someone market some sub Sonic 220s? I think I remember seeing a box at one point.
- Status
