308 vs 300AAC
- Thread starter Grayrock
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Flynt said:
I have a POF P308 as well. Did you try shooting suppressed/subsonic with the gas plug rotated to N? I ask because the gas port is smaller when the gas plug is rotated to S so I'm wondering if the larger port would help to get more gas to push the bolt back. Working up subsonic loads for the POF is one of many projects I still haven't got to yet.
I have a DD SBR in 300 Blackout and a number of .308 Win rifles and I don't see much overlap between the two cartridges. A suppressed SBR in 300 BLK shooting subsonic ammunition makes for a really good home defense rifle. A suppressed AR 308 shooting supersonic ammunition makes for a really good anything else rifle. I consider the .308 Win to be a better all-around cartridge if you have to choose one.
What is in question now is what range and target the OP actually intends to use the rifle for. It's the real issue. .300BO is a 200m max round, .308 will run 800m and more.
What range and target is really intended? Put a maximum practical distance on it, and describe the target, then pick the cartridge that is suitable. You choose what best fits that task, not what is popular or if it could be stuffed into a particular magazine.
In the choices given, range does have a particular input into the decision. There are incremental differences that make one a better fit than another. We don't even know if suppressed use is even intended, so we need to know more about the circumstances to even comment with some credibility. .300BO vs .308 was far too wide a variation to start with.
What range and target is really intended? Put a maximum practical distance on it, and describe the target, then pick the cartridge that is suitable. You choose what best fits that task, not what is popular or if it could be stuffed into a particular magazine.
In the choices given, range does have a particular input into the decision. There are incremental differences that make one a better fit than another. We don't even know if suppressed use is even intended, so we need to know more about the circumstances to even comment with some credibility. .300BO vs .308 was far too wide a variation to start with.
ny32182
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Correct, that is what I meant. But I also thought Grendels actually are proprietary... I believe they were for quite a while (anybody who wanted to make Grendel-anything had to pay licencing fees)... is that no longer the case?
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Grayrock
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This is the input I got from my friend. We will be in central Texas hill country. Usually driving up on feed pens or walking up on a pack of hogs will likely not be a very long shot. He already has long distance guns. I think he just wanted something to throw a little more lead downrange, be handy for easy sighting and deployment and be something he could point to and say "My friend built me this rifle." Does that provide a better perspective to what I am seeking?
Yes ... and a 300 BLK would be very good in those situations. Add a suppressor and a scope/reticle with supersonic/subsonic stadia and it would be even better. I have my suppressed DD SBR sighted in at 50 yards with 220gr subsonic ammunition since it's primarily a home/car defense rifle. The 220gr bullet drops approximately 6" at 100 yards with barely any loss of velocity. Even at 200 yards (36" drop) the bullet has only lost 50 fps. Your friend could have a lot of fun with the 300 BLK and it would certainly be capable and most likely preferable to a .308 Win in that situation. Shorter, lighter, less recoil, functionally quieter (suppressed), cheaper to shoot, good super/sub loads available, plenty of options for handloading, and a true multipurpose short range cartridge. What's not to like?
LKLive13
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Not even a close matchup. 308 shoots a lot longer range than 300BO
Ibmikey
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Ibmikey
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NY 32183, Try installing a Magpul enhanced buttpad to the CTR stock, you will notice a great difference after shooting a few rounds
Varminterror
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This has not been the case for several years - Alexander Arms released the trademark on the 6.5 Grendel name in 2011, after which SAAMI recognized it. Prior to that time, it was only the reamers, dies, brass, and barrels which were really affected. Mags and bolts were never subject to the trademark concern.
To the subject of the conversation - mags and bolts, both for the 6.5 Grendel were readily available even prior to the SAAMI recognition, as it uses the same bolt and magazines as 7.62x39mm.
bangswitch
Member
Without reading all the posts beyond this one, I'd reply that the .308 AR-10 will be heavier than the 300BLK AR-15, and more expensive to shoot. Knowing his primary purpose would be a big help for everyone to know in order to most appropriately recommend which one.
I have an M4 in 300BLK that I built, as well as a .308 semiauto (but not an AR-10). I reload for both. Both calibers can use the same bullets, but .308 brass is more expensive, and the case takes twice as much powder. 300BLK 125 gr. loads are about 2000 fps on average, .308 runs about 3000 fps for the same bullet weight. MV drops more as bullet weight climbs for 300BLK than it does for .308; a 200 grain 300BLK will go about 1400-1600 fps, whereas .308 will go around 2400, and a semiauto .308 may have issues with the heaviest bullets (past about 178 gr.). The 300BLK is good with 220 gr for subsonics. I load mostly 125's and use my 300BLK in CQB matches, but have shot a couple of 300 yard silhouette matches using 155 grain.
If he's wanting a good caliber for long distance shooting, I'd recommend a 6.5 Grendel on the AR-15 platform, or a 6.5 Creedmoor on the AR-10 platform. Both are good past 1000 yards, where the .308 starts to fag out around 800. I built a Grendel upper to use the same lower receiver as my 300BLK.
marksman13
Member
If hunting 150-300lb animals within 300 yards is the primary goal, the 6.8 SPC II is the way to go. Ammo is a little more difficult to find than 300 BLK or 308, but not so much so that it is not worth adding the cartridge to your stable.
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