anybody got an ar10 in 6.5-284

[spencerhenry]

i am thinking of building an ar10 in 6.5-284. i am trying to find out as much as i can about reliability, magazine issues and the like. i know it can be done, that they exist, i just dont want to build one and then find out that they have some kind of little quirk.

[mrfish83]

I have a DPMS LR-260 in 260 rem. What's the COAL for the 6.5-284? I always thought it was considered a long action. Most AR-10 mags limit COAL to around 2.810"

[spencerhenry]

6.5-284 does not need a long action. if you want to seat bullets way out then the short action is short. a 6.5-284 most certainly does fit in an ar10. question is whether it is a good choice.

[Hoser]

My gunsmith in Pueblo built one a few years back. Ran good with virgin brass. After that it got finicky. He said he would not build another.

I would go with a 260 in an AR-10 if you want a 6.5 something. He has built several of them and they are much lower maint and cheaper to shoot. When I rebarrel my OBR it will be in 260.

[spencerhenry]

that is exactly the kind of information i was looking for.

my idea was to build a long range coyote gun, get the flattest shooting caliber in the rifle as possible. but in further research, the trajectory of a 6.5-284 vs a 308 is not as great as one would think. at 700 yds with optimum components in each the difference is only about 16 to 20 inches, at 300yds it is only like an inch or so. lately i have been wondering about a 6.5-300saum, i have read that the saum case is better for use in an auto. but havent found much for ballistics yet.

[C Ward]

Any caliber in an AR10 platform is going to be a comprimise with other than a 308 based cartridge. All the odd ball caliber riifles are inherently finiky and even the 260's and 243's can be , form powder burn rates and how it affects the port pressure of the gun .

To get the most out a 6.5/284 it really needs to be a long action gun . To take advantage of the case capacity and the high BC bullets it needs to be loaded long . When loaded to SAMMI OAL it will not reach the 3000fps range with 140's , the highest BC's are in this weight range .

If the high BC bullets are not going to be used it makes no sense to go with a hot rod cartridge that will shorten barrel life and increase your loading head aches . If varmint bullets are going to be used I'd get a 243 and be done with it .

The wind drift is really the more important number to compare since the bullet path is a known value and is compensated for with the scope before the shot .