AR-15 Caliber Change?

[Mike D]

AR-15 Caliber Change?

What is the attraction to 300 BO with its rainbow trajectory and difficulty with bullets expanding at low velocity?

It's a suppressed home defense round

Not true Brent.

I've killed 2 nice bucks with my 300 blackout, a 190# 10 point and a 160# 12 point. On the 12 point I was actually using subs. Watched both deer fall in sight. I've lost count of how many pigs I've killed with it with every one being DRT with shoulder shots. I use the 110 grain Barnes TAC-TX bullets exclusively.

And this is a 3 round group I shot with it this week at 300 yards. Disregard the high shot. We'll chalk that one up to shooter error.



Oh and all of this is with an SBR with 8" barrel. Yes the 300 blackout is an short range cartridge (250 and in) IMO but it doesn't get the credit it deserves.




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[lbbf]

I have an AR in 223 Wylde. Wanted something to reach out a little farther so I built a 6.5 Grendel upper. Just pull the pins take the 223 off, put the 6.5 on and push the pins back. I love it since I can practice with the 223 and save a few pennies but when I put the 6.5 on the stock and trigger are the same. I put the same scope on both.

[muddydog]

I'm actually on the opposite side of the OP. I have the 300 blk and want to add a 5,56. Either will work for whitetails with good shot placement. I will simply do a barrel swap on my gun. It's a simple 5 minute job with the right tools. Only disadvantage I see with this is the need to re zero the optic. Not a big deal....just use the 300 for deer, hogs, then switch to 5.56 for range fun shoots.

[justintyme8303]

Try these Federal

https://www.federalpremium.com/ammunition/rifle/family/fusion/fusion-msr/f223msr1

[35remington]

I will simply do a barrel swap on my gun. It's a simple 5 minute job with the right tools.

I would not trust a barrel replacement to maintain zero.

[Bucksaw]

If I were in your shoes, I would just buy a new 300BLK upper. You can get one complete for $300 or so. Then get a scope that lives on that upper, and keep your current scope on the .223.

That's a thought. I didn't think of that.

[Bucksaw]

I have an AR in 223 Wylde. Wanted something to reach out a little farther so I built a 6.5 Grendel upper. Just pull the pins take the 223 off, put the 6.5 on and push the pins back. I love it since I can practice with the 223 and save a few pennies but when I put the 6.5 on the stock and trigger are the same. I put the same scope on both.

So, how are those 6.5 rounds on price and availability?

[muddydog]

I would not trust a barrel replacement to maintain zero.

I mentioned the need to rezero after a change.

[35remington]

I mentioned the need to rezero after a change.

We're not talking about the same thing. You are talking about setting one zero for .223 and another for .300BLK.

I'm saying that if you go from .223 to .300BLK and then back to .223, I would not trust that you can just click the scope back down to the old .223 value and trust it.

[coop]

Mike D, I don't mean to de-rail the OPs thread but how does the 300 compare to the 7.62X39.

[Zen Archery]

Get a better scope. (I usually pay 1.5 to 2x for the scope the. I do for the gun). Get some 70gr Barnes TACTX or TTSX and you'll be set. Never go cheap on hunting ammo. No point in having a good gun and shooting moderate ammo (ya know, the killing end.). Unless you reload hot ammo for the 300Blk it's not gonna do anything a well placed 5.56/.223 Barnes bullet can't do at 100 yards.

If you get new upper .300, .277, 6.5, 6.8, 7.62x39 etc. you'll still have to get new glass. And spend more. So just update scope and ammunition if you're a budget person.

[Bucksaw]

The scope was great, just didn't get it strong enough. Its only a 1-4x28. Thinking I should have listened to others above and just went with a 3-9 and left it on 3 for close shots. But, I can always just buy a new scope. This is primarily a plinker, and for taking into the woods to scout around in the off season. IF I am in the woods during deer rifle season I am going to have my TC, so for now, it will be OK. I might even get one of those 45ed rail mounts and put some iron sights off the side, if I can find one to fit a lefty.

[Mike D]

Mike D, I don't mean to de-rail the OPs thread but how does the 300 compare to the 7.62X39.

Roughly very similar performance. Just less problem prone feeding in an AR than 7.62x39.


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[Outback]

6x45.....I don't know how that caliber shoots yet but that's my best suggestion.

^^^I built an upper with one of these and really like it. It kills deer and hogs dead with a bigger hole than the .223 and it's surprisingly accurate. It uses .223 cases as the parent case and resizing is a snap.

[AndyRealtree]

I'd just build another upper and swap them out depending on the situation. Lets you keep the 5.56 for plinking and shorter stuff, and let's you have a bigger caliber on another upper for longer shots. Thinking about doing just that as I have 2 5.56 15 and a .308 10

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