Looks Good!!

Any AR15, not chambered in 5.56/223, pistol calibers, 22LR, or WSSM calibers (6.8 7.62x39, 300 FB etc.)

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Looks Good!!

Postby DocH » Wed Jun 28, 2017 1:00 am

I found the following interesting...

"Back from the dead! It's the 6.5x45mm once again! Now much more slickly rendered, and this time with a 144gr bullet fired at a modest but potent 2450 f/s. Optimized for the mountains of Afghanistan, this load of the 6.5x45mm hits harder than even the vaunted 7.62x54mmR past 1000 yards, due to its insane sectional density and high ballistic coefficient, producing 40 ft-lbs more energy at that range than the Russian cartridge. This cartridge is lightweight, at only .040lbs per round, it is closer in weight to 5.56 (.028lbs) than 7.62x51 (.060lbs), but outperforms both. It is loaded with the slick 144 grain Lapua Full Metal Jacket Boat Tail bullet, but with an added cannelure for reliable feeding and cartridge durability. The heavy bullet ensures rapid incapacitation, but the FMJ design allows compliance with all European and international agreements."


From:http://nolo84.deviantart.com/art/6-5x45mm-144gr-184877083
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Re: Looks Good!!

Postby John A. » Sat Jul 15, 2017 3:03 pm

Yeah, the military is wanting to replace 5.56 with something else.

So, they took 308 and subtracted 223 from it, and right smack dab in the middle was the 6.5's and such.

I'm more interested in the 9x39mm Russian, but that's just me.
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Re: Looks Good!!

Postby Colorado Osprey » Sun Jul 16, 2017 5:22 am

DocH wrote:I found the following interesting...

"Back from the dead! It's the 6.5x45mm once again! Now much more slickly rendered, and this time with a 144gr bullet fired at a modest but potent 2450 f/s. Optimized for the mountains of Afghanistan, this load of the 6.5x45mm hits harder than even the vaunted 7.62x54mmR past 1000 yards, due to its insane sectional density and high ballistic coefficient, producing 40 ft-lbs more energy at that range than the Russian cartridge. This cartridge is lightweight, at only .040lbs per round, it is closer in weight to 5.56 (.028lbs) than 7.62x51 (.060lbs), but outperforms both. It is loaded with the slick 144 grain Lapua Full Metal Jacket Boat Tail bullet, but with an added cannelure for reliable feeding and cartridge durability. The heavy bullet ensures rapid incapacitation, but the FMJ design allows compliance with all European and international agreements."


From:http://nolo84.deviantart.com/art/6-5x45mm-144gr-184877083


The problem with the 6.5x45 and the 7x45's are that very, very few bullets can be loaded to mag length for the M4/M16 variants... the 144 grain Lapua is not one of them. If we are comparing bolt guns why choose such a puney cartridge if not limited by mag length. The 260 Remington for example does all that and more and is an off the shelf product in guns and ammo. It is even available in the AR-10 size chassis.

It would also be interesting to see how they got to their velocity with the 144 grain bullet. All the load data for that cartridge from almost 40 years of wildcatting put the velocity at or below 2100 ft/s with a 144 grain bullet and only the 85 grain loads were up to 2400 ft/sec .

Interestingly enough if you put a 85 grain pill in a 6x45 you get 2800 ft/sec a 400 ft/sec gain. Even stranger for comparison is the 223/5.56 with a heavy 80 grain bullet is only 2700-2800 ft/sec with the lighter bullet.

The 6x45 seems to always outshine the rest in a ballistic comparison basted on the 223/5.56 casing including the 223/556. To quote Mike Milli aka Dtech, " It makes ballisticians go grey."
Lets just remove all the warning label and let nature take its course.
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