Question about building an AR

[Atroxus]

Still thinking the.300blk sounds better. I really like the idea of being able to use the same bolt and magazines for 5.56.

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[Swannytheswan]

Heck.. look at the .300 OSSM.. need a new bolt and barrel, but has 30/06 ballistics.  Contact Chris Meyer with Titan Outdoors.. he loves his.

I shoot an AR in .243 WSSM...  I am pushing a 90 gr. Accubond faster than 3000 fps.   legal for deer, too..   and it rocks the yotes too.

with the .243 wssm does that fit in a AR-15 and what mags and bolt does it use?? sorry I don't want to hijack but I just read bout it and I like the sound of it

[Huntbear]

The .243,.25, and 300 OSSM all work very well on a standard AR platform..

I have Pmags that work just fine, I just took a small amount off the top, so the bigger/fatter case would go in...
I also have 3 metal 5 round mags for hunting.

It will take a new barrel in, and BCG.. I do not know for sure but I think there is only 2 companies making them.  The one I have is Olympic Arms. 

I can not wait to see how it performs on deer at 300-400 yards with the Accubond load I have worked up.  I also have a bunch of Varmint Grenades worked up for it too... basically will blow a yote in two...   

[KFhunter]

I've interested in the 6.5 grendal round myself

[JohnVH]

love my grendel

[FALFire]

Still thinking the.300blk sounds better. I really like the idea of being able to use the same bolt and magazines for 5.56.

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You will not get anywhere near .308 performance from a 300 Blackout. The 300BLK is the old 300/221 aka 300 Whisper from SSK Industries made long ago and works very well for very close range use when suppressed. There is a slightly better offering called the 7.62x40 that is available through Wilson Combat, Wilson was not the creator of the round but liked it so well he now offers it through his website. The 7.62x40mm is designed to shoot lighter weight .30 caliber bullets using a slower twist rate like 1-12 keeping velocities higher than the 300BLK. The 300BLK typically uses a 1-8 twist to spin the 200+ grain bullets.

I know full well what the 300BLK is, I have one and it isn't worth doing just because it uses the 5.56 bolt unless you plan on shooting suppressed, there are much better cartridges available and you already mentioned it.... the 6.8SPC. I've had two of those but sold them after having a very difficult time finding brass, perhaps brass is easier to acquire these days but not likely due to the recent events and the best brass comes from Silver State Armory located in Packwood, Wa.

If you are using the AR for big game the 243WSSM and 25WSSM flat out kick everything else in the teeth and never has to come up with a BS excuse for not performing. Now that Oly Arms has the .300 OSSM you can have near 30-06 performance from an AR15...That is serious firepower. The WSSM rounds feed exceptionally well from a slightly modified 20 round AR15 mag, the downside is you cannot build one from parts, there are only a couple of gunsmiths that have Olympic ARMS approval to build those uppers, Oly Arms of course then there is Mike Milli aka (DTECH) owner of Dedicated Technologies, he hangs out on Predator Masters.

Oly Arms will not sell you any of the parts nor will they sell to any gunsmith to build the WSSM calibers..... at least that was the way it used to be a few years ago.

There is one that you may have over looked, the 6WOA aka 6x6.8SPC aka 6mmDTECH, slight shoulder changes make them ever so slightly different and not interchangeable. They all use the 6.8SPC parent brass necked down to 6mm, using a 22" or longer 9 twist tube from BlackHole Weaponry located in Moses Lake, Wa. the 6x68 has produced some pretty nice results. I inquired about this wildcat round years ago when the 6.8SPC came about but then no one was doing anything with it, now it's the hottest ticket available and can easily shoot 95gr Bergers into one ragged hole at 100 yards. Recoil is slightly more than a standard 5.56 but velocities can be in the 22-250 zone, plus it is not as hard on the operating system as the WSSM rounds are and the brass is no where near as difficult to resize. I built a 6x6.8 upper for my neighbor and it's a shooter no doubt, first rounds loaded were producing 2 inch groups at 300 yards with noticeable velocities well above standard 6.8 rounds.

With the 6.8SPC we found we were losing too many coyotes when shooting them with 90gr Speer TNT'S even with good solid hits the dogs just ran off, so we moved to the 110 V-Max bullets where we started blowing huge holes in the pelts making them worthless, we dumped the 6.8's and went back to 22-250's then up to the 243Win using 95 Bergers, nice clean holes without the major pelt damage. The 6x68 will be used extensively next season for dogs as so far it has turned out to be a very good dog gun that is extremely accurate and easier on pelts using the Bergers.

One other 6mm caliber is the 6x45 which uses the standard 223 case necked to 6mm, this is what I use. It is very effective on coyotes with little to zero damage using Berger bullets and 55gr Nosler ballistic Tips. It is deer legal in this state and kills deer very well using most any 85gr soft point bullet. No mag mods need to be done and obviously still retains the 5.56 bolt.

[thinkingman]

Still thinking the.300blk sounds better. I really like the idea of being able to use the same bolt and magazines for 5.56.

Sent from my DROID BIONIC using Tapatalk 2

You will not get anywhere near .308 performance from a 300 Blackout. The 300BLK is the old 300/221 aka 300 Whisper from SSK Industries made long ago and works very well for very close range use when suppressed. There is a slightly better offering called the 7.62x40 that is available through Wilson Combat, Wilson was not the creator of the round but liked it so well he now offers it through his website. The 7.62x40mm is designed to shoot lighter weight .30 caliber bullets using a slower twist rate like 1-12 keeping velocities higher than the 300BLK. The 300BLK typically uses a 1-8 twist to spin the 200+ grain bullets.

I know full well what the 300BLK is, I have one and it isn't worth doing just because it uses the 5.56 bolt unless you plan on shooting suppressed, there are much better cartridges available and you already mentioned it.... the 6.8SPC. I've had two of those but sold them after having a very difficult time finding brass, perhaps brass is easier to acquire these days but not likely due to the recent events and the best brass comes from Silver State Armory located in Packwood, Wa.

If you are using the AR for big game the 243WSSM and 25WSSM flat out kick everything else in the teeth and never has to come up with a BS excuse for not performing. Now that Oly Arms has the .300 OSSM you can have near 30-06 performance from an AR15...That is serious firepower. The WSSM rounds feed exceptionally well from a slightly modified 20 round AR15 mag, the downside is you cannot build one from parts, there are only a couple of gunsmiths that have Olympic ARMS approval to build those uppers, Oly Arms of course then there is Mike Milli aka (DTECH) owner of Dedicated Technologies, he hangs out on Predator Masters.

Oly Arms will not sell you any of the parts nor will they sell to any gunsmith to build the WSSM calibers..... at least that was the way it used to be a few years ago.

There is one that you may have over looked, the 6WOA aka 6x6.8SPC aka 6mmDTECH, slight shoulder changes make them ever so slightly different and not interchangeable. They all use the 6.8SPC parent brass necked down to 6mm, using a 22" or longer 9 twist tube from BlackHole Weaponry located in Moses Lake, Wa. the 6x68 has produced some pretty nice results. I inquired about this wildcat round years ago when the 6.8SPC came about but then no one was doing anything with it, now it's the hottest ticket available and can easily shoot 95gr Bergers into one ragged hole at 100 yards. Recoil is slightly more than a standard 5.56 but velocities can be in the 22-250 zone, plus it is not as hard on the operating system as the WSSM rounds are and the brass is no where near as difficult to resize. I built a 6x6.8 upper for my neighbor and it's a shooter no doubt, first rounds loaded were producing 2 inch groups at 300 yards with noticeable velocities well above standard 6.8 rounds.

With the 6.8SPC we found we were losing too many coyotes when shooting them with 90gr Speer TNT'S even with good solid hits the dogs just ran off, so we moved to the 110 V-Max bullets where we started blowing huge holes in the pelts making them worthless, we dumped the 6.8's and went back to 22-250's then up to the 243Win using 95 Bergers, nice clean holes without the major pelt damage. The 6x68 will be used extensively next season for dogs as so far it has turned out to be a very good dog gun that is extremely accurate and easier on pelts using the Bergers.

One other 6mm caliber is the 6x45 which uses the standard 223 case necked to 6mm, this is what I use. It is very effective on coyotes with little to zero damage using Berger bullets and 55gr Nosler ballistic Tips. It is deer legal in this state and kills deer very well using most any 85gr soft point bullet. No mag mods need to be done and obviously still retains the 5.56 bolt.

This is where I'm heading.
If you reload, why mess with anything else.

[Swannytheswan]

i really need to start reloading so i can play with all those cool wildcats

[rock]

.450 bushmaster, go big or go home.

[JohnVH]

.450 bushmaster, go big or go home.

it wouldnt be that then, it would be the .50 beowolf

[mountainman]

To the first question of the Op...it can and has been done. Check out the multi-caliber Hydra. Quite a concept. Played with one quite extensively at thi years S.H.O.T. show. Can be put into .308 win in just a few seconds.. Check it out!...

http://www.mgi-military.com/index.php?id=2&sub_id=24

[Atroxus]

.450 bushmaster, go big or go home.

it wouldnt be that then, it would be the .50 beowolf

Can either of those be used with a standard ar-15 lower, and the 5.56 magazines?

To the first question of the Op...it can and has been done. Check out the multi-caliber Hydra. Quite a concept. Played with one quite extensively at thi years S.H.O.T. show. Can be put into .308 win in just a few seconds.. Check it out!...

http://www.mgi-military.com/index.php?id=2&sub_id=24

That Hydra system looks very cool, but I am guessing very expensive and all or mostly proprietary parts.

Part of the reason I am looking to build an AR instead of buying one whole is because I am on a very tight budget. Building will allow me to spread the cost out over time as I buy components. I'll be getting my lower and parts kit next month, and it will likely be a month or more after that till I have money to buy the next piece(s) for my build.

Budget concerns are also in part why I am still leaning towards the .300BLK. I like the idea of being able to swap just the barrel instead of an entire upper, as well as being able to use the same mags for both calibers. I also reload, so being able to cut down 5.56 brass to reload for .300BLK is very attractive as well.

[JohnVH]

.450 bushmaster, go big or go home.

it wouldnt be that then, it would be the .50 beowolf

Can either of those be used with a standard ar-15 lower, and the 5.56 magazines?

Yes, both are AR15 size

[rock]

Yep, same magazines and everything, just connect the new upper.

[Atroxus]

Yep, same magazines and everything, just connect the new upper.

Nice...guess I will have to do some more research/comparisons then.