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From the chart it looks like 9" to 11" is the sweet spot for the 300 blk. You are still adding 40 to 50 fps up till around 11". From 11" to 15" its around 30 fps and closer to 20 fps after 16". 16" is about the max, even though their are small gains after that. Anything less than 9 you are giving up a good bit.
I went with a 8 inch for my 300. The attraction of having a rifle the same length as a 16" Carbine that was supressed was simply too great. An 8" gets you 90% of the energy of a 16" 556. 9" gets you 94%. The new Barnes black tip expands to 375 yds from an 8" barrel. Perfect - exactly what I was looking for.
Question for the hive about zeroing 300 blackout. I will primarily be shooting 300 BLK subs with a suppressor. Looking at a few ballistic tables I can see the vast difference in trajectories between supers and sub. Right now, my only can is a pistol can (rugged obsidian 9) which is rated to 300 subs. So primarily going to be shooting subs.
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Quoted: 300blk is a jack of all trades, master of none. The legend looks like it will be better at subs, but either you have to buy a new suppressor, or use a pistol suppressor and give up supersonic suppressed. Seems a little less interchangeable with 556 as well, have to mod your mags. Legend will be good at getting around some hunting laws.
Sounds like it isn't too far off my predictions in the ballistics chart in terms of relationship between subs and supers, which is a good sanity check too. Sounds like with a little fine tuning and bring the super zero down a bit at 25yds, you will have a pretty practical 25yd zero for subs and supers, and still a useable trajectory at 100yds
For subs 5 mils of hold overs at 10X only gets out to about 200 yards. On my 8” AR with a red dot I co-witness Magpul LR Pro rear sight and zero supers at 50/180ish. The 200-600 settings on the rear sight get out to about 450. For subs the 350 setting starts at about 50 and the 600 setting gets to about 250.
I'm not sure what the charts called, ballistic drop chart perhaps, but I'm looking for the ballistic drop chart for Sig Sauer .300 Blackout 220 gr Sierra Match King Elite Match Grade subsonic ammo. I'd like to see what the drop is at 125 and 150 yards. I searched online but couldn't find it.
Originally Posted By boltedsafe: $150.00 3" chambered 12 gauge pump with Brenneke Black Magic Magnum (12 GA 3") Slugs. Forget the 300 Blackout for Grizzly Bears, would it kill one, yes, but why take a chance. View Quote. This and throw the BO at the bear to distract him while you dump him.
In answer to your first question, M193 out of a 7.5" barrel will never reach sufficient velocity to fragment. In answer to your second question, YES.The 300 blk was designed for short barrels. It has nearly the same ballistics out of a 8" barrel as it does from a 16" barrel. Posted: 3/6/2014 3:36:02 PM EDT.