Part of the reason for poor accuracy would be related to velocity speread, a very easy problem to run into when .1 grain of powder is equal to 1 percent of your total load of powder. Running the numbers in JBM a 208 amax at 900 fps will drop a whole minute lower then the same bullet at 950 fps.
300 AAC Blackout Accuracy Issues
- Thread starter RockChucker
- Start date
I have had much better luck with the subsonics and accuracy with aa1680 powder. Have been able to keep it below moa. Some people can see this as useless, others will like it. I have no use for a 44 mag mares leg, others do. I like interesting crap and am having fun with my blackout that I built. I will have an ar barrel to match soon. My bolt gun had an 11.5 inch barrel and is great in a backpack or a car trunk for coyotes and other critters at 300yrds with a 110 vmax or a 125 BT. To each their own.
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Seems fairly obvious to me.
(notice no hearing protection)300 Blackout / Whisper has been around for more than 25 years. It long predates many of the boutique short magnums that have come and gone since and judging by the reaction to it in the US, it will be around for a long time.
300 BLK is at its best in a short barreled PDW where it doesn't lose velocity like most other military cartridges and packs a punch all out of proportion to the firearm size. It is a niche cartridge but it has its uses and it is interesting to shoot for many reasons.
It punches a hole in paper as good as any restricted firearms can, and many of those can only be used for that purpose in this country.
That's cool Ranger, you don't have to like it or need it but a 110 vmax turns gophers into pink mist, as well as carves out an apple sized hole in coyotes. All from an 11.5 inch barrel and 1/3 the powder.
Not trying to convince you either. If I had to pay a smith I would do the same and stick with my 308, but I did it myself so all it cost me was half a blank(I split it) and time. I still live my 308 and will never not have one but it's about 1/3 the cost to shoot at close range and fits in a large backpack in its current configuration so....to each their own. Now to build my 6mm crusader....another weird caliber....
Not trying to convince you either. If I had to pay a smith I would do the same and stick with my 308, but I did it myself so all it cost me was half a blank(I split it) and time. I still live my 308 and will never not have one but it's about 1/3 the cost to shoot at close range and fits in a large backpack in its current configuration so....to each their own. Now to build my 6mm crusader....another weird caliber....
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Me, I would just buy the 308 Winchester and be done with it. I see no use it it.
If you want to fire a close ranges with out hearing protection, buy the Ruger SR22 and a brick of 22 rimfire! At least you could take it out to shoot gophers!!!
The whole point to the .300 Blackout is that you have a versatile cartridge that will perform well in short barrelled rifles. That's why all of my Blackout carbines are 16" and less. I've already got several long barrelled .308 Winchesters.
As "fun" as a short barrelled .308 Win. sounds (pardon the pun), I'm glad I went with the smaller more efficient Blackout.
Whatever blows your hair back.
BTW, I bought a SR-22. It broke on the first day I used it. "Tacti-cool" ain't cool at all when it's busted.
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Back to the 300 AAC accuracy issue, I'm convinced that the problem is that a barrel twist which will stabilize a 240gr subsonic bullet is simply to fast for a 110gr bullet and vice-versa.
Optimal barrel twists:
Good luck getting top accuracy with both bullets in the same barrel!
Trying to find a 6mm barrel which shoots 69gr FB bullets and 115gr VLD is probably simpler
Alex
Optimal barrel twists:
- 240gr SMK 1-9" or better
- 110gr Berger FB 1-19"
Good luck getting top accuracy with both bullets in the same barrel!
Trying to find a 6mm barrel which shoots 69gr FB bullets and 115gr VLD is probably simpler
Alex
Back to the 300 AAC accuracy issue, I'm convinced that the problem is that a barrel twist which will stabilize a 240gr subsonic bullet is simply to fast for a 110gr bullet and vice-versa.
Optimal barrel twists:
- 240gr SMK 1-9" or better
- 110gr Berger FB 1-19"
Good luck getting top accuracy with both bullets in the same barrel!
Trying to find a 6mm barrel which shoots 69gr FB bullets and 115gr VLD is probably simpler
Alex
I don't think twist rate has much to do with accuracy unless the bullet is under-stabilized. If light weight bullets are going to exhibit poor accuracy in the Blackout, then it's either a design/quality issue of the bullet itself or the huge amount of free bore the bullet must travel before hiting the rifling. The Blackout is throated so that 220gr. SMK's come in at an OAL of 2.26" in order to fit AR mags. At 1/2 the bullet weight, 110gr. bullets have a considerable jump.
The only problem with your theory is that typically the BLK produces better accuracy with light bullets than with heavy subsonics when running both in a fast twist rate.
Personally I think it has something to do with the powder burn rate and loading density. A very fast powder would be the equivalent to giving the bullet a smack with a hammer and then let it coast the rest of the way.
god. please come out to southern alberta to play... Also, that crusader looks interesting damn it -115gr going 3300? I do kind of want.
I'm anxiously awaiting juanvaldez to get his reamers so he can ship my 12"
it's been a looooooong three month wait, go gage just came in. The rest of the parts (stock, trigger, mounts, optics) were way quicker than expected so I've been playing with a goofy looking pencil barreled Stevens .223 on the local gophers.
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god. please come out to southern alberta to play... that crusader looks interesting damn it. 115gr going 3300? I do kind of want.
I'm anxiously awaiting juanvaldez to get his reamers so he can ship my 12"
it's been a looooooong three month wait, go gage just came in. The rest of the parts (stock, trigger, mounts, optics) were way quicker than expected so I've been playing with a goofy looking pencil barreled Stevens .223 on the local gophers.
Hate to burst your bubble but the Blackout won't do 3,300 FPS with 115gr. bullets. Unless it's a typo, it should be more like 2,300 FPS.
Currently, I'm using a Bushnell 3200 10x scope. It's ok, however, it's not the best sope I have available for load development. I've got a B&L 4200 6x24 scope going on my Rem. 700 for the next range session.
Until I'm satisfied with load development, I'm going to stick to 100 yds. for now. Ultimately, I won't see much use for this cartridge beyond 300 yds. for my purposes. My plan is to use this carbine for supersonic loads.
My short barrelled Weatherby will be for short range use only. It'll be 150 yds. or less. I suspect I'll leave the SPARC or my 1.5x5x Falcon on it for optics. It'll mainly be used for subsonics.
I threw my nightforce on it for a while while I wait for me new surgeon to come in for my 308. I have a falcon 4-16 to try out with it. Probably way more than enough for it. Might even end up throwing a vortex 2.5-10x44 on it. Seems to be about the proper size for the rifle.
na1|b0hm - I'm in Calgary, and am always interested in going and shooting stuff. Let me know when you get it all together and I'll send you some of my load data to try and help get you started. And yes the crusader should be sweet. I'm just getting all the pieces together...maybe in the fall time. I have a nice bartlien gain twist waiting to have rounds go down it.
na1|b0hm - I'm in Calgary, and am always interested in going and shooting stuff. Let me know when you get it all together and I'll send you some of my load data to try and help get you started. And yes the crusader should be sweet. I'm just getting all the pieces together...maybe in the fall time. I have a nice bartlien gain twist waiting to have rounds go down it.
I am also using an Elite 10x on my BLK bolt gun i think that is a good compromise for this round . Where are you in S Alberta? There are a number of us in Cowtown with Blackouts. Mine being the coolest of course.
I'm out about two hours east of cowtown... Easiest way to find the closest major center is to follow your nose. (locals will get that one) haha.
It just so happens that I have one of those wonderful bushnell 10x sitting on my reloading bench, a casualty of a direction change.
Thanks c4, load data would be good, just starting to acquire components now, so as soon as the barrel is installed I can get out shooting.
and suputin, after seeing some of your posts, not a doubt in my mind that yours is the coolest....
we'll have to get some people together and have a .300 blk shoot, I have no problem making the drive.
It just so happens that I have one of those wonderful bushnell 10x sitting on my reloading bench, a casualty of a direction change.
Thanks c4, load data would be good, just starting to acquire components now, so as soon as the barrel is installed I can get out shooting.
and suputin, after seeing some of your posts, not a doubt in my mind that yours is the coolest....
we'll have to get some people together and have a .300 blk shoot, I have no problem making the drive.
