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Posted: 11/27/2007 7:32:19 PM EDT
I've lost it already. For my next project Ive decided to work off of an AR10 action. And for the most part when the choice of caliber came into question it was simple! 308 win right?....


The first thing that set it off was the 260 rem, then the rsaum, the wsm, Marty's rhino's, hell anything that could fit and feed from an AR10 mag.

I'm stuck. I've gone through all the pro's and cons but I need good advice.

What does the hive mind of ARFCOM say?

Think "tactical" purposes here, but not SHTF. If it was shtf I would have gone with 308 and that would have been it. I'm thinking 600-800 yard ranges, flat trajectories, very little drift, "the works" as they say.

So what do you guys think? Oh bye the way I like pie!
Link Posted: 11/27/2007 7:47:14 PM EDT
Link Posted: 11/27/2007 7:49:54 PM EDT
260 from your list but, 243 if it was there.
Link Posted: 11/27/2007 9:05:25 PM EDT
Hell if theres a better choice, you tell me!
Link Posted: 11/27/2007 9:21:53 PM EDT
[Last Edit: 11/27/2007 9:24:25 PM EDT by constructor]
I just think the flatter, the better for unmarked distance and less recoil doesn't hurt either. 95gr sierras @ 3200 in the .243 or 123gr Scenars @ 2950 in the 260 will smoke a 308 easily. the 308,260,243 will fit and function like the rifle was made for themwith 19 in the mags.
Link Posted: 11/29/2007 2:40:13 PM EDT
There are just SOOO many viable options these days, it's insane. I know I have driven myself batty over calibers, still do. All can be good options within respective parameters.

I have come to the conclusion that 308, 260, and 300 ALL perform incredibly well, and unless your shooting a match, the real world results will all be close, say inside 1000 yds.

If I were I rich man, would have first a .260 with some 142's loaded up, and then a .300 Win Mag with some 200 BTHP's, just for that extra "ooommphh" at distance.

Link Posted: 11/29/2007 4:14:36 PM EDT
I have too many that duplicate most of the others. For me the next build on the AR platform will be the .338 Rhino once Marty gets the Rhino brass in.
Link Posted: 11/29/2007 4:16:06 PM EDT
Either the 260 or 6XC.
Link Posted: 11/29/2007 4:17:56 PM EDT
Rhino's brass is not avail at this time.

300WSM doesnt work too well, but 300RSUM does.

I wouldn't use a caliber less than 308 for a LR rifle. Give up too many bullet options.

Do you reload?

1.I would go with the 308, tons of ammo/brass/bullets. Loads and dope readily available. Huge selection of match ammo available. 1000yrds with 175SMK is "easily" attainable. Its not "flat" shooting but just about every variation has been loaded and works well. Proven

2. 300RSUM IF you reload AND want to go past 1K. Give up too much mag capacity/ cost for a "special" round. Barrel wont last that long.

Link Posted: 11/29/2007 4:22:53 PM EDT
If you are considering customs like the Rhino, you may also want to look at the 6.5x47 Lapua. It's shorter case is a little better fit for long ogive match bullets of 130 grains or more.


Link Posted: 11/29/2007 4:29:23 PM EDT
.260 Rem, or 7mm/08.
Link Posted: 11/29/2007 4:39:43 PM EDT
[Last Edit: 11/29/2007 4:41:01 PM EDT by gks452]
Even though I picked .308 I really like the .260. It's a great all around round for anything under 250 pounds. But for some reason 6.5mm is a caliber that never caught on in the USA. I think the doom of the .260 was all the magazine articles that listed it as a good caliber for women and recoil shy men. Nothing like calling something good for ladies and whips to ruin something good.
Link Posted: 11/29/2007 4:51:26 PM EDT
[Last Edit: 11/29/2007 4:56:45 PM EDT by CaptSchofield]
ok since your leaning towards a custom caliber why not invent your own.

After reloading for many, many years I finally took the plunge and decided to make one just for me.
It was the 25 WSSM necked out to .358 hence the, 358 WSSM, shortened for legality in my state for Deer hunting. Now every one I know wants one.

Here is one to ponder, how about a 308 necked to .277 you could call it .27-08 or 6.8-08 or even the .278
Easy conversion, plentiful brass, large bullet selection.
You could probably get a .277, 115 OTM really smokin' powered by a 308 case.
Load out the 140gr or 150gr bullets for a long range screamer
If I were going to build a AR-10 it is what I would do
Link Posted: 11/29/2007 5:53:09 PM EDT
You forgot to add a few:

257 Roberts +P with the 115 Berger

6.5 x 55 with shorter lighter bullets

If going custom:

277 on the 6.5 x 55 case, as the 6.8 SPC bullets allow the longer case and still fit the mag. To me, this might be a VERY nice combination. I hereby officially propose to call it 270 Phalcon .... a quick foray into QuickLoad suggest (24" barrel, 115 gr bullet, 55000 psi) 3100 fps ...

Why not 30-284 or even 27-284?

338 RCM?
Link Posted: 11/30/2007 4:29:17 AM EDT
can you even get brass for a rhino?
Link Posted: 11/30/2007 5:01:19 AM EDT
I picked .308, I have had some really odd ball calibers in the past and have decided that I am sticking to more mainstream choices from now on. I just don't have the time to mess with wildcats, custom or hard to find replacement parts, and the like right now. Sometimes it is nice to be able to just go buy a box of factory ammo and shoot. .308 will do all you want out of this rifle. The other caliber I would have considered is .243, most of the parts will be identical, factory ammo is common, and you can handload it to be a great long range paper puncher.
Link Posted: 11/30/2007 9:05:54 AM EDT

Originally Posted By constructor:
260 from your list but, 243 if it was there.

+1, but I am biased towards 6mm cartridges.

Link Posted: 11/30/2007 11:33:11 AM EDT

Originally Posted By 223Rem:

Originally Posted By constructor:
260 from your list but, 243 if it was there.

+1, but I am biased towards 6mm cartridges.

+2, most anyone who shoots competitively and wins uses a form of 6mm.
Link Posted: 11/30/2007 1:56:40 PM EDT
Although it's not listed, 7mm/08 would be damn awesome. The 7mm/08 is my favorite 'large framed' rifle at current. I shoot the hell out of mine.
Link Posted: 12/3/2007 4:59:03 PM EDT
So, did you choose?

Link Posted: 12/4/2007 11:38:29 AM EDT
I'll take 260 rem. theres enough 308 win out there in terms of ammo I understand that. if i ever want to convert back to 308 then its as simple as a barrel swap so SHTF is covered.

but better ballistics all around is the way to go in this scenario.

I'll find ammo from hsm and blackhills (if it ever comes back again)

I would be paying the same for match grade ammo in either case.

Speaking of barrel swaps I'll even set some cash aside for a 338 rhino barrel.

Link Posted: 12/4/2007 1:18:09 PM EDT
I think my next AR10 will be a 260.

What the hell should I do with the other four stripped lowers
Link Posted: 12/5/2007 5:30:03 PM EDT
[Last Edit: 12/5/2007 5:31:07 PM EDT by Falar]

Originally Posted By ALASKANFIRE:
I think my next AR10 will be a 260.

What the hell should I do with the other four stripped lowers

I voted .308 because it is very popular with tons of load data and bullets available and is versatile enough for pretty much anything. However, an AR10 in .260 would be really cool for a dedicated long range rifle as it is basically a flatter shooting .308 using smaller, lighter bullets. If Armalite offers them again I'll pick up a .260 upper with the 24" match barrel.
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