How many calibers are there in the AR10?

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14 years 5 months ago #4581 by Gunnut
How many calibers are there in the AR10? was created by Gunnut
Seams that there should be more than just .308! The AR10 action is plenty big enough to handel larger calibers the only limit seam to be the .308 mag! 2.8" coal. The 308 is a great versital round and can be custom loaded for most any application. But, how about a 7mm magnum for long flat shooting? The AR15 comes in many different cals. The next logical thing would be to do the same with the AR10. Just my thoughts.

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14 years 5 months ago #4583 by CoyoteDel
Replied by CoyoteDel on topic Re:How many calibers are there in the AR10?
I own AR10 thats chambered in 300WSM you might try accurace system in Colorado they do a real nice work on custom AR platform rifles

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14 years 5 months ago #4584 by lotoofla
Replied by lotoofla on topic Re:How many calibers are there in the AR10?
Your right that the AR-10 platform 'should' handel more calibers but for some it becomes a caliber, bullet weight, and twist specific issue. something that the bolt guns don't have to deal with. When itcomes to the 6mm (243win) the gas port size becomes VERY criticle. Some of the Custom Competion AR-10's in 243Win, 260Rem. and 7/08Rem have the gas port moved 2 inches forward from the stock position to get better timing with the gas system. ArmaLite has a better article about this on ther web site.
Tom

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14 years 5 months ago #4585 by Gunnut
Replied by Gunnut on topic Re:How many calibers are there in the AR10?
Cool! So, It's not a matter of it being overlooked. Just a matter of doing your homework for a custom barrel?

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14 years 5 months ago #4607 by lotoofla
Replied by lotoofla on topic Re:How many calibers are there in the AR10?
Yes that is correct. Case in point has to deal with the M-14 rifle. Its gas system differs from the M-1 Garand in that it will take just so much gas/pressure/volume that it will shut off taking any more before it cycles. This is why powder selectiom becomes more criticle for the M-14 rifle. Match shooters who use 190+grs bullets have to fine tune their rifles by rejetting the shutoff valve* to handel these bullets. Armalites National Match 7.62 NATO rifle is configured to use 168-190gr bullets for the 1,000 yard events and may not cycle reliably with anything lighter or heaveyer.
Tom *The shut off valve is used in combat to propel grenades with a special blank cartridge.

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14 years 5 months ago #4621 by BUILDING MY SASS
Replied by BUILDING MY SASS on topic Re:How many calibers are there in the AR10?
If you go to the home site....you will see that there are a few different calibers...you can call armalite and check as to which ones are available...some need to be special ordered....
other wise check DPMS...if you are looking for a smaller cal...243 270 and I think they make a 204 ruger if memory serve me right.. :silly:

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14 years 5 months ago #4622 by a Guest
Replied by a Guest on topic Re:How many calibers are there in the AR10?
Yea there are 12ga to 50BMGs on down. There out there if you look. The 12ga turkey shoot uppers are great mounts for the scopes. Watched a guy make $60000 one night.MSH

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14 years 5 months ago #4623 by lotoofla
Replied by lotoofla on topic Re:How many calibers are there in the AR10?
When you start going smaller in bore size your now 'painting yourself into corner' gas wise. This is were you MUST KNOW EXACTLY what caliber, what bullet weight(s), your going to use, other wise reliablity goes out the window. This pursuit should only be done by serious competetors looking for an advantage. The 204Ruger is made for the AR-15 platform by others, not the AR-10.
Tom

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14 years 5 months ago #4625 by BUILDING MY SASS
Replied by BUILDING MY SASS on topic Re:How many calibers are there in the AR10?
HAHAHAHAHHAHA.....you where paying attention... :lol:

Yes I know the .204 is on the 15 frame....Had to many thing on the computer at the same time...LOL
as for gas pressure...that all depends on who is making them...given that the .243 .260 270 and .308 are all the same casing for the most part...it is just the neck and shoulder and bullet size that differs...so I have read that most of the loads for them are pretty close...so I would say that "gas pressure is not a real concern depending on what distance you are shooting... and you always can install a gas valve to compensate.....
MSH put some light on this if you would.....
BMS

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14 years 5 months ago #4627 by a Guest
Replied by a Guest on topic Re:How many calibers are there in the AR10?
I'll put this back up on this section so as not to rewrite it but the 243 as an example can be a gasroid if you know what I mean. The 300 WSM is the worst of the lot but is workable. You can only extract after the pressure has eased of the case and that calls for a little dwell time up the barrel for this to happen. Lots of failure to extract with this one for that reason.MSH



Adding weight beats things up both ways and plays havic on the weak buffer tube threads. Wait until you have one of those break. I saw Tubb's break, funny as heck. The weights increases recoil to the shooter. The high power and race guns that we assemble are timed for low recoil. The buffer spring compresion rate is one of the main players. There will be no damage with the increase power buffer springs as long as you count the stack dim of the wire dia and don't have the compresion bottom out. It will increase forward recoil very little and the bolt cam pin takes most of the hit in the cam area only shired with the face of the bolt carrier and the barrel extension which has the most impact. Change cam pins every 20000 rounds. Ejection location is a direct factor of bolt carrier rear thrust speed. The more important thing is travel of the spent case. The rule of thumb is 3'at 3 o'clock. You only need 19500 psi to cycle the actions so gas port location is targeted to that location. Bullet weight factor is key here, a 243 set up for 58gr bullets can use a +2" gas port location where as the same using 107s will use a +4" gas port location. There aint a good combo location for the 243 where as a barrel set for heavy bullets most of the time won't cycle the light ones. The weight systems and heavy buffers should be left to blow back systems on the pistol rounds. We had a guy put all that stuff in his rifle and his scores dropped in the rapid fire stages because he couldn't stay on target. He wouldn't hear of doing it the right way and then wanted to enrole in my civilian class, he didn't get in that ether. I never told him why because it put him out of winning the matches.MSH

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