Reloading 7.62x39 Relative to 6.8SPC?

Self Regulated

Self Regulated

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Hey guys,

I have been investing alot of my time thinking whether or not I should spend the cash and invest in an AR15 upper in 6.8spc, but like many of us, money is always an issue. Once you factor in the upper, brass, bullets etc. you are looking at big money.

I myself have a CZ858 and love it due to the fact that ammo is super cheap. I recently have been considering to reload for it for some longer range shooting. If I used a .310 cal bullet in 110gr, 100gr or even 90gr bullets, would this not compare to the velocity of a 6.8spc relative to the grain of the bullet?

I would imagine a 90gr bullet out of a 7.62x39 would yield approximately 3000fps or so from the muzzle. This would make for quite the paper puncher out to 500m and I would assume it would still retain a fair amount of energy at that distance.

Am I making any sense to anyone? :D
 
Well, I mean you see guys with Ar-15's spitting rounds out to 500m with a 55gr or 60gr bullet. So I can't imagine a 90gr or even a 100gr bullet having that problem.

Am I wrong in saying that?
 
That's because a .223 in 55-60 has higher bc than than 100 gr. .308 or .310. when shooting long range Ballistic Coefficient makes a difference...not just muzzle velocity.

There really isnt' much out there in .310 for relading anyways.
 
Pathfinder said:
That's because a .223 in 55-60 has higher bc than than 100 gr. .308 or .310. when shooting long range Ballistic Coefficient makes a difference...not just muzzle velocity.

There really isnt' much out there in .310 for relading anyways.
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Mystic Precision has 123 grain Hornady Vmax in 310, great bullet, outshoots any other ammo I've tried in my sks. My range is only 200 yards, but no problems out that far....
 
gpracer said:
Mystic Precision has 123 grain Hornady Vmax in 310, great bullet, outshoots any other ammo I've tried in my sks. My range is only 200 yards, but no problems out that far....
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Have you considered building your AR in 7.62 x 39? It might be an acceptable compromise. Components are easier to find at the moment than for the 6.8 SPC and I agree with gpracer about the Hornady VMax bullet in 123 gr. I am shooting it at 300 m with excellent results on an AR platform.
I also have looked into the 6.8 SPC and from what the guys in the states tell me, the 6.8 SPC barrel is going to be hard to come by for a while yet. They say not that many barrel makers to fill multiple demands. The 6.8 is at the bottom of the list so they tell me. The short COAL of the 6.8 reduces the amount of powder space limiting velocities; bullet selection isn't great at the moment either.

Just a thought.
 
Ever check to see what Rem 6.8 SPC loaded ammo is worth ?
No brainer 7.62x39 hands down a clear winner for an AR.
Have had one for over a year now and not thinking of selling as long as surplus ammo stays CHEAP!
 
What does .308 and .310 refer to again? Why is .310 better for longer distances? All this reloading is fairly new to me so I apologize.

If you could find a 100gr or 110gr bullet and stuff a bit more powder in the casing I am sure you would have a great round for 400m-500m shooting.

I have considered purchasing an ar-15 in 7.62x39, but I already have a CZ858 and I believe the CZ's are capable of great accuracy even in a restricted 15.4" version.

What does the AR-15 have that the CZ doesn't other than availability of parts? Would I want a DI AR-15 over a short stroke piston CZ-858?

:dancingbanana:
 
Self Regulated said:
What does the AR-15 have that the CZ doesn't other than availability of parts? Would I want a DI AR-15 over a short stroke piston CZ-858?

:dancingbanana:
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Will your CZ-858 do this at 100 yds? 16inch barrel; Falcon 1.5 x 5 SIR scope; 123 gr. VMax Hornady bullet; WW Brass; Hornady LR Match primer

AR30calgroup.jpg
 
Truthfully, it probably would if not extremely close. CZ's with surplus garbage shoot 1.5"-2" at 100 yards on a good day. I can't imagine what it would be with handloaded ammo on a bench.

What size is that diamond target?
 
There is no physical reason why a .30 caliber must have a lower BC than a .223. If you can find a high BC bullet it would be worth seeing what you can do. Give it a shot and post pics! A bit of drop doesn't matter if you have a laser rangefinder. Bullet weight doesn't directly affect wind much, BC does.
So go for it!
 
Juster said:
There is no physical reason why a .30 caliber must have a lower BC than a .223. If you can find a high BC bullet it would be worth seeing what you can do. Give it a shot and post pics! A bit of drop doesn't matter if you have a laser rangefinder. Bullet weight doesn't directly affect wind much, BC does.
So go for it!
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And BC stands for....? :confused:
 
gpracer said:
Mystic Precision has 123 grain Hornady Vmax in 310, great bullet, outshoots any other ammo I've tried in my sks. My range is only 200 yards, but no problems out that far....
Click to expand...

hmmm. must be new, cant find it on the hornady website. The only 123 gr. .310 bullet I see there has .252 BC...hopefully its not too windy on the 500 yard range :D

I agree that the hornady will shoot well in that case as it does in most from what Ive experienced.
 
Self Regulated said:
Truthfully, it probably would if not extremely close. CZ's with surplus garbage shoot 1.5"-2" at 100 yards on a good day. I can't imagine what it would be with handloaded ammo on a bench.

What size is that diamond target?
Click to expand...

Group Size .914 inches on a 2" diamond.
 
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