300 BLK Zeroes and Trajectories

[dbain99]

Good stuff. Any info on the 220's. I don't plan on shooting past 200, and I wonder if there isn't a good medium for one zero that covers both supers and subs.

No.
With my 10.3" I have a 10" spread between subs(220gr) and supers(110-125gr) at 100 yards. I have not shot subs past 100 nor do I intend to.


Sent via telegraph with the same fingers I use to sip whiskey

[CPM]

Thanks, that's what I thought. Ditto on the 100 yard subsonic range.

[SWATcop556]

For those who are zeroing at 25 yards I hope you are shooting past that to confirm any necessary hold overs.

My AAC 9.5 is zeroed at 100. I hit about 1.5" below POA at 50 and about 6.5" at 200 shooting 110 supers.

Its a niche gun but I have a need for it and it works very well for its intended purposes.

[friendlyfireisnt]

Its a niche gun but I have a need for it and it works very well for its intended purposes.

Any chance you can tell us about the niche or purpose for it?

I know I have my own reasons for the .300blk (specifically the 110gr Blacktips). But I am always curious about others.

Thanks.

ETA:
Right now I have my 10.3" .300blk zero'd @ 100 yards. Based on JBM's #'s that puts me damn close to 175 yards, 1/2 a foot low at 200 (7 inches my but who's counting), 1 ft low at 250 (15") and 2 ft low at 300 (26"). I may not be able to remember the exact inches of the drop, but I can remember 1/2, 1 & 2.

I am debating on switching to 35 yard zero, but haven't committed yet.

[fledge]

Disregard. Not directly related to zeroes and trajectories.

[tom12.7]

I would not say that it is a niche cartridge. When you look at component stresses, strains, erosion, etc.. The 300 Blackout can have advantages for many going less than 11.5" in an AR base platform compared to 5.56.

[daddyusmaximus]

I'm getting in the .300blk game as of today. My gunsmith ordered the Wilson Combat 11.3" barrel for my old 9.5" SBR upper. For close range shooting like home defense/SHTF patroling (what this will be) everything I have read gives the advantage to the .300blk over a 5.56 in a SBR. Now my shortest 5.56 will be 16".

[mig1nc]

I was playing around some more with the JBM calculator.

If you grab the default data for the Hornady 110gr V-Max (a very common round for Blk), and grab the published 9" V-Max numbers from AAC, then the JBM calculator gives you the following:
Maximum PBR: 256 yd Maximum PBR Zero: 220 yd

It first crosses the line at 25 yards. So it looks like a 25 yard zero confirmed at 220 is a pretty good way to go.

If you want to zero for the top of the arc so you never have a hold-under, that looks like 80 yards.

[Eurodriver]

I had an AAC 9" 300BLK. It was zeroed at 220 yards (not 25 and "guess its ok at 220"). This was with 110gr Barnes handloads. My issue with the round was the POI issue between supers and subs (subsonic cycling is the only true advantage of the round for me). Using a T1 there was no really good zero that worked well for both, and a T1 isn't easily adjustable.

Additionally, the round drops like a rock beyond 250 yards even out of a 14.5" Noveske. Out of a 16" barrel, 110gr Barnes will drop 100" at 500 yards while Wolf Gold out of an 11.5" 5.56 drops less than 80". It gets even worse if you use quality 77gr out of the 5.56.

For me, it wasn't worth having to store the additional caliber so I sold it. Took six deer with it though...still have love for it.

[tom12.7]

If you know your dot size and use it, you can make quality hits quickly out to 250 quickly out of the PDW sized package. You can stretch it longer with a little more time. It's not that hard or really slow, just not as quick as a simple possible double in dot size offset.
I would prefer another option for a 500 yard application and beyond. Those would not be PDW sized. Sure, I've made good hits on target easier with more barrel length in 5.56, but you may sacrifice close in use.
For closer in targets that would more than likely cover most users of a PDW type of platform, I would still lean towards the 9"-9.5" Blackout over the same barrel length in 5.56 or 9mm for use at the distances here.