Which new cartridge with Ar-15 upper

[chrisk]

I stripped an upper that I have not shot for years. I currently have .300 blk, 5.56, 7.62x39 and 6.5 Grendel. What next?

[TacticalCowboy]

450BM, 458 socom, 50 Beowulf

[DUKFVR]

300 ham'r

[chrisk]

450BM, 458 socom, 50 Beowulf

And I have a .450 Bushmaster, my bad

[Colton]

6.8 SPC, 6 ARC or 224 Valkyrie

[okrattler]

Depends on what you're wanting to do with it. If you're gonna be shooting deer, pigs and varmints I'd get a 6ARC or .224 Valkryie.

[TacticalCowboy]

And I have a .450 Bushmaster, my bad

350 legend, maybe?

[bloodtrail18]

25-45 Sharps

[chrisk]

25-45 Sharps

I like this cartridge from what I have seen

[Clay C]

Sounds like you have your basis covered, so why not something fun and cheap(ish) to shoot? You could go .22LR or do a RDB 9mm conversion from CMMG.

[Drycreek3189]

6.8 SPC punches above its weight !

[TheWidowMaker]

6.8 SPC punches above its weight !

if you go this route the only barrel I recommend is an ARPerformance which are now sold by blackstone armory. I'm shooting a 90gr gold dot reload out of an older 14.3" ARP barrel 2900fps. That's some good ballistics.

[Drycreek3189]

if you go this route the only barrel I recommend is an ARPerformance which are now sold by blackstone armory. I'm shooting a 90gr gold dot reload out of an older 14.3" ARP barrel 2900fps. That's some good ballistics.

I have an ARP barrel on what I call my “night” gun and an AR Stoner on my “day” gun. Both of them shoot a 115 grain Federal Fusion very well, and both were rebarreled from .223/5.56. The 6.8 is just a good cartridge !

[Billy Bad Bass]

6.8 SPC or .300 Ham'r

[xman59]

i would likely choose the 6mm arc,,,, or a 10mm upper