Now if we're stepping up to AR-10 length and going for maximum subsonic mass then skipping 8.6blk for something like the .375 Raptor might be interesting for reloading. Just neck up a .308 WIN and shove 400gr of copper in there.
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The 375 can have higher numbers but it's still shooting the same weights as the 8.6 as there's 405gn coppers for that too.
The 375 seems cool but would be arguably more costly for basically the same thing as you're stuck paying for modified mags/modifying your own and $450 minimum for a chambered barrel.
8.6 although I guess controversial is quite ironed out as a cartridge/platform type thing as it uses unmodified "cheap" AR10 mags and seems to have crazy good reliability from the testing done while making it.
It's better ironed out than the .300blk as I've experienced serious mag binding in probably 6 different kinds of mags when using a handful of different sub loads. The 8.6 can't do that as the bullet diameter is the neck diameter of a .308 so the anti tilt ridges won't contact or rub that hard. I can't speak to the 8.6 but .300 supers are also pretty iffy as some of them are REALLY short in the mag and will sometimes have serious feeding problems.
Gassing is another matter which the 8.6 seems to have handled pretty well. The pressure differencial with the .300 at the chamber is like 15K-62K which is insane. I've had issues with this personally with supers being punchy as fuck and damaging the rubber end of a buffer in like 100 rounds WITHOUT a can. That upper is still extremely over gassed with an 11oz 9mm buffer without a can yet doesn't cycle subs that reliably without a can. Q seems to have learned from that and applied it to the 8.6 by having the chamber pressure/pressure at the gas port for supers and subs be a lot closer together giving better cycling.
Adjustable gas blocks are sorta out of the question as with how dirty subs are the toolless ones seize up and are really best to be set and forgotten if your gas port is oversized.
I'm still not buying shit in 8.6 but as a hunting cartridge it seems quite good if range isn't a major priority. The supers seem quite impressive and the cartridge lends itself to shorter guns with it being done burning powder sooner than smaller bore calibers.
I got bit hard by subsonics but am moving on and selling a lot of the gear as they're not particularly useful unless you KNOW you actually have a use for them. Having to range shit for anything past like 75 yards to get good hits gets old and maximum effective range while theoretically being very good is way harder to actually make use of.
I agree with 100y being about the max range for .300blk as shit just seems to fall apart beyond that. Supers make just about everything easier to do
got two mec-gar glock mags for my old man's dagger and it turns out that the mag catch can't hold them in. the mags fall out when you shoot. fucking daggers, dude. i'm just gonna keep the mec-gars and get him OEM glock mags instead which is probably what i should have done in the first place.
I got some and the work good in my G17, AR9, and P80s. We'll see how they hold up but I think they'll last longer in the AR9 as that likes to chew up the mag catch notch on my other mags.
Probably 800 rounds deep over 7 mags, I like how smooth they feel over both Glock and other compatible mags I have
