When I finally get around to building a 300 Blackout my hunting bullet of choice will be the 168 Gr. Nosler bonded performance projectile. Seems like it will be in the perfect spot, or I will just build a really short 308 Winchester. Havn't decided yet.
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- Thread starter jiffx2781
- Start date
migrant hunter
CGN Ultra frequent flyer
- Location
- Southern Alberta
Well I got the call, so Wolverine will be making mine run. I guess I might get to kill a deer with it this year after all!
I'd better get my drill running and cut down some brass.
I'd better get my drill running and cut down some brass.
migrant hunter
CGN Ultra frequent flyer
- Location
- Southern Alberta
Yes, same barrel. Kinda curious about if the extra barrel length will give any real gains in velocity.
Well hopefully it will feed a soft point, many semi auto's have problems with them. Only one way to find out though, hope they work well for you.
168gr is heavy for 300BLK, velocities are not impressive when you get that heavy and probably won't be enough to ensure reliable expansion. Check your reloading manuals, you're way down on velocity compared to a 308 win or 30-06 which that projectile was designed for.
I've found the 155 A-max to be the best projectile for 300BLK balancing projectile weight and velocity. I have a couple different loads with that projectile that give sub moa performance from my ACR and my bolt action 300BLK.
I'll have to check my logs to see what velocities I was getting with each but I went back to 150 class projectiles and also mostly gave up playing around with subsonic loads as you still need to wear hearing protection and you really need to lob them in.
Yes it does but many of these guys are not hand loaders so since it's even harder to find factory loads it appeals to people a lot less. Plus you would need to have a bolt custom made for the 180 which makes it not only harder to convert but much more expensive.
It's a good round but not as practical for most people. 300BLK just needs a barrel swap and in this case since the gas system of the 180 is not the same as an AR and the gas port in his new barrel is sized for a DI AR it needs to be adjusted a little.
OP, measure the gas port of the factory 223 barrel, it should be close to the gas port size you need if it functioned cleanly on 223.
Not enough to make any real world difference, I've shot 300BLK in 10 inch, 16 inch, and 19 inch and it's hardly noticeable.
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Back when I had my PWS 10" 300BO I found that Hornady 208gr factory loads would not cycle that rifle even though my handloads with the same projectiles would cycle. Just a reminder that not all factory loads will cycle a semi auto.
I think you said you were using 110gr Hornady but you may want to try a couple other loads before you get too carried away opening the port.
Too bad you're so far away, would be a lot easier if you were testing at my place. We'd have it running in an hour, and a hand load developed in under three hours.
If you're serious about 300BO I would strongly recommend you start looking into handloading, it's the only way to really take advantage of the cartridge's versatility. I have loads developed for projectiles from 110 to 208 and pretty much everything in between.
To the other guys wanting 300BO that are handloaders, be sure to check your reloading manuals before you buy powders for this cartridge, it's a lot more picky and and even some powders listed as being compatible are only useful in a bolt action.
There are others that will work but I use H110 for light projectiles (110-140gr), Lil'Gun and A1680 are my go to powders for supersonic 140-168gr, and I use A1680 for 208gr subsonic loads. I have some built to test IMR4227 but haven't gotten around to shooting them yet.
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I seem to remember you also saying you don't shoot much other than hunting, not as good of a round for someone that also wants to burn off a couple hundred rounds in an afternoon like I've done with other 300BLK rifles I've owned.
And I think it was you who also found that running heavier cartridges in a lighter action like 450BM in an ACR leads to equipment failures. I think that was you anyway.
This is why I bought a Modern Hunter in 6.5CM rather than a Modern Varmint in 6.5G, if I want the power and velocity I just buy a rifle that is built for the case capacity I need to get the results I'm after.
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