MRGG-A (6.5 CM) vs 6 ARC?

[rlsmith1]

Of course Hornady has done a lot of good with the 6 ARC and I love my 14.5" version has been great. Now I'm starting to see (or maybe just pay attention to) 14.5" 6.5 Creed rifles and I'm kind of intrigued. Anyone have experience with both and have any input?

I love my 18" 6.5 CM AR10 and I'm trying not to convince myself to chop it to 14.5" but the 14.5" AR10's seem pretty sweet and my MK5 2-10 sure feels more at home on an AR10 than an AR15

 

[Bigjake83]

Of course Hornady has done a lot of good with the 6 ARC and I love my 14.5" version has been great. Now I'm starting to see (or maybe just pay attention to) 14.5" 6.5 Creed rifles and I'm kind of intrigued. Anyone have experience with both and have any input?

I love my 18" 6.5 CM AR10 and I'm trying not to convince myself to chop it to 14.5" but the 14.5" AR10's seem pretty sweet and my MK5 2-10 sure feels more at home on an AR10 than an AR15

A buddy of mine bought this rifle from PSA. I helped him set everything up and it was easily a Sub MOA rifle with Hornady American Gunner 140gr ammo, keep in mind that was right out of the gate with no break-in so I'm sure once the barrel brakes in and with handloads it could realistically hit the half MOA mark.

They're out of stock now so I would just check in with PSA every week, PSA seems to do a good job at restocking thier rifles in a timely manner.

 

[rlsmith1]

A buddy of mine bought this rifle from PSA. I helped him set everything up and it was easily a Sub MOA rifle with Hornady American Gunner 140gr ammo, keep in mind that was right out of the gate with no break-in so I'm sure once the barrel brakes in and with handloads it could realistically hit the half MOA mark.

They're out of stock now so I would just check in with PSA every week, PSA seems to do a good job at restocking thier rifles in a timely manner.


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Did you get a chance to shoot it much past 500y yet? Seems like Norma 130 Golden Match might be a good bullet for that barrel length too?

 

[ut755ln]

Of course Hornady has done a lot of good with the 6 ARC and I love my 14.5" version has been great. Now I'm starting to see (or maybe just pay attention to) 14.5" 6.5 Creed rifles and I'm kind of intrigued. Anyone have experience with both and have any input?

I love my 18" 6.5 CM AR10 and I'm trying not to convince myself to chop it to 14.5" but the 14.5" AR10's seem pretty sweet and my MK5 2-10 sure feels more at home on an AR10 than an AR15

To me they are completely different animals. The advantage of the 6 ARC is that you take a small frame standardized AR and increase the capability versus 5.56. Most of the 6 ARC rifles I have shot or seen shot have no problem staying super sonic to 1k yards and shoot flatter at any range in between versus 5.56.

The 6.5 CM gas guns are large frame, not small frame. So to me they are heavier, kick more, less standardized, ect. They can be just as accurate and depending on the setup (barrel length, cartridge) definitely have more range than the 6 ARC. The MRGG entries the military conducted were very similar in terms of goal compared to the 6 ARC. They are taking an existing platform like the KAC SR25 and changing to a more efficient cartridge that extends the range and arguably the lethality of the weapon.

 

[rlsmith1]

To me they are completely different animals. The advantage of the 6 ARC is that you take a small frame standardized AR and increase the capability versus 5.56. Most of the 6 ARC rifles I have shot or seen shot have no problem staying super sonic to 1k yards and shoot flatter at any range in between versus 5.56.

The 6.5 CM gas guns are large frame, not small frame. So to me they are heavier, kick more, less standardized, ect. They can be just as accurate and depending on the setup (barrel length, cartridge) definitely have more range than the 6 ARC. The MRGG entries the military conducted were very similar in terms of goal compared to the 6 ARC. They are taking an existing platform like the KAC SR25 and changing to a more efficient cartridge that extends the range and arguably the lethality of the weapon.

Yeah I agree, but in some ways the 6.5 CM variant is a little more standardized (standard AR10 bolt and magazines) when compared to the ARC (Grendel bolts and mags). I do think the ARC / Grendel cartridge is going to stick around, but being able to run Creed ammo is a really nice feature.

Might just have to try it but I'm a little hesitant to chop this Criterion that shoots so well as an 18" right now!

 

[rlsmith1]

After running the numbers, the 6 ARC shooting a 108 ELD should expand out to 680y (2525fps MV, 1600fps threshold) while the 6.5 CM shooting a 140 ELD should expand out to 710y (2450fps MV, 1600fps threshold) which is pretty much a wash. Of course the Creed has more energy, but both have over 550ft/lbs of energy at 750y (the 6.5 has 700ft/lbs while the 6 has 575ft/lbs). They are also within 0.5 MIL for drop and 0.1 MIL for wind out to 750y and stay supersonic to pretty much the same distance (within 60y of each other).

Not sure it's worth the weight penalty to me but may try it down the road if real world results are different. Below is a summary of assumptions which are best I could find online (6 ARC is pretty much where I've seen things in my rifle).

14.5" 6 ARC
108 ELD M @ 2525fps
1000' std DA

14.5" 6.5 Creed
140 ELD M @ 2450fps
1000' std DA