Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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rjrivero
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by rjrivero »

silencertalk wrote:Why bother when 300 AAC BLACKOUT is out?

300 AAC BLACKOUT brass can be made from 223 brass, and there is factory subsonic.
There are some places in the country where you can NOT hunt with stepped down rifle cartridges. You CAN hunt with 30 Carbine because it's strait walled.

Just saying. There are SOME areas where this would make sense for some.
snipecatcher
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by snipecatcher »

silencertalk wrote:I have not verified 2000 fps from a 7 inch barrel, but it should work at 55,000 psi with H-110 powder and a 110 grain bullet - in a real 300 AAC BLACKOUT chamber.
I think that may be pushing it. If I seat a 110 V-max on 17 grains of 2400 (faster than H110), I get 1950 fps in a 10" barrel. I could get 2000 fps, but the load would be compressed and I would have flat/dimpled primers. This is with a 300 Blackout chamber. The faster burn rate of 2400 is probably a better match for barrels 10" and under.
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300Blk
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by 300Blk »

The powder which gives the most velocity in a normal barrel length is probably the same powder that gives the most velocity in a very short barrel. This is because peak chamber pressure - the limit of how much powder you can use, is reached when the bullet has only moved less than an inch.

The Remington 123 grain factory ammo does 2100 in a 9 inch so 1950 fps in a 10 inch seems way slow for 110 grain.

Check your brass, chamber, and bore.
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by 82nd airborne »

Is this actuall chronograph velocity, or is it how remington usually does (Ie. .30RAR) where the box says one velocity and the actuall velocity is about 300fps slower? Im assuming you have actually chrono'd the factory ammo extensively.
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curious sam
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by curious sam »

IIRC most factory ammo is chrono'd out of a longer barrel, like 24" or 26".
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by daviscustom »

I was simply wondering why 30 carbine would be a bad option. It's a straight walled cartridge so I assume with carbide dies no lube would be needed. Since it is not a brand spank'n new cartridge there may be deals to be had on brass and reamers and dies. The slow twist standard barrel is certainly a big strike against 30 carbine since it would mean a custom barrel. Mostly I was just kicking the idea around and thought maybe I could get a straight answer instead of just a line-up of 300 Blackout cheerleaders. It very well may be that 300 blk is the best choice, but I was curious why it would be better other then the obvious availability of factory subsonic ammo and factory chambered rifles. ( I realize these are not small considerations)

I have a pretty good supply of .308 bullets, and as of yet, no brass/dies/guns for any of these options, so this was simply a fact finding mission....I had/have no other agenda in asking my questions.
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300Blk
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by 300Blk »

82nd airborne wrote:Is this actuall chronograph velocity, or is it how remington usually does (Ie. .30RAR) where the box says one velocity and the actuall velocity is about 300fps slower? Im assuming you have actually chrono'd the factory ammo extensively.
Ha. No. The Remington advertised velocity for 300 AAC BLACKOUT is actually the velocity is the loaded to on the press.

Fact is, the single biggest reason why published velocities are never achieved in the real world is because they test them in barrel lengths longer than anyone has.

To solve this problem, we made 16 inch the "standard" SAAMI barrel length for 300 AAC BLACKOUT.
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by 300Blk »

82nd airborne wrote:Is this actuall chronograph velocity, or is it how remington usually does (Ie. .30RAR) where the box says one velocity and the actuall velocity is about 300fps slower? Im assuming you have actually chrono'd the factory ammo extensively.
The factory ammo is rated at 2315 fps, and Noveske chronoed it at 2340 and a govt user got 2360.
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by 82nd airborne »

I like that method much much bettter than using a 40" barrel and a casefull of C-4 to get velocity numbers.
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Aaron Fouraker
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JohnDS
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Re: Pros/cons of 7.62x25 vs 30 carbine vs 300 Blackout

Post by JohnDS »

Is it Remington ammo, or Hornady ammo produced under contract for Remington?

When will it be readily available? I keep seeing people requesting re-loaders to sell them ammo...?
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