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Do you folks think the new? Barnee 85 grain 223 would replace the 6x45, at least in an AR platform? I dont know if u can buy just the bullets yet?
 

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Do you folks think the new? Barnee 85 grain 223 would replace the 6x45, at least in an AR platform? I dont know if u can buy just the bullets yet?
That is one log-asses bullet. I would suspect it would need at least a 1:6 twist and a 1:7 at the slowest.
It would have to be so deeply seated I don't see it repacing anything.
 

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they are close to each other but nothing ever seems to eclipse another cartridge when it "comes close" --- they will both work

85grain barnes: barnes says it's 1.069" long and requires a 1:8 or faster twist--their match ammo is loaded to 2.245" coal, and it clocks in at 2583fps from a 20" colt with a 10fps SD---- barnes aslo states it's best to single load them and they are only for wylde or nato chambers NOT 223rem

6x45 :
75 gr (5 g) SP
2,700 ft/s (820 m/s)
1,214 ft·lbf (1,646 J)
80 gr (5 g) SP
2,650 ft/s (810 m/s)
1,248 ft·lbf (1,692 J)
90 gr (6 g) SP
2,540 ft/s (770 m/s)
1,300 ft·lbf (1,800 J)
100 gr (6 g) SP
2,400 ft/s (730 m/s)
1,279 ft·lbf (1,734 J)
 

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they are close to each other but nothing ever seems to eclipse another cartridge when it "comes close" --- they will both work

85grain barnes: barnes says it's 1.069" long and requires a 1:8 or faster twist--their match ammo is loaded to 2.245" coal, and it clocks in at 2583fps from a 20" colt with a 10fps SD---- barnes aslo states it's best to single load them and they are only for wylde or nato chambers NOT 223rem

6x45 :
75 gr (5 g) SP
2,700 ft/s (820 m/s)
1,214 ft·lbf (1,646 J)
80 gr (5 g) SP
2,650 ft/s (810 m/s)
1,248 ft·lbf (1,692 J)
90 gr (6 g) SP
2,540 ft/s (770 m/s)
1,300 ft·lbf (1,800 J)
100 gr (6 g) SP
2,400 ft/s (730 m/s)
1,279 ft·lbf (1,734 J)
An 85 grain bullet in a 6x45 can be pushed to 2750+ in a 20" barrel. The .224 bullet will have a slight ballistic advantage.
 
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