300 blackout

4runnerman · May 17, 2015, 04:34 PM

Hello all. First run for me with this caliber. I have trimmed 500-223 cases,annealed them. Getting ready to size, trim,chamfer and load. Using CCI400 primers, Accurate 5744 powder. At this point in time all I have is 168 gn bullets. Seems 110 to 125 gn is the primo weight to be in for accuracy. Any advice or help would be great.

Sharkbite · May 17, 2015, 06:15 PM

Check out 300blktalk.com. Lots of load data there.

You are correct...for supersonic ammo the 110-125gn bullets reign. Subsonics usually use 200+ grain pills

You dont mention the platform you will be shooting. 5744 will work fine in a bolt gun. If running an AR its all about gas port location and size.

I have loaded some 150gn supersonics. Only because the bullets were so cheap. 168's wont give you the speed the 110's will. The cartridge really is best at the two ends of the weight spectrum.

Get on the other forum and read...its a cool cartridge within its limits.

4runnerman · May 17, 2015, 06:21 PM

Thanks Shark. It's my bosses. I think he said it was the pistol version?. It's an AR, but man is that baby short. Has this stock on it with a velcro strap to velcro it to your arm right above the wrist.

velillen · May 17, 2015, 06:39 PM

I've shot plenty of the 147gr bullets and have had good accuracy. Get moa with them. I've used the 5744 since it was all I could find but I'm not to happy with it. Always up with unburned powder which obviously effects accuracy.

But yes generally you see the 110 for supers and 200 plus for subs. Though I've heard of guys using 175 smk for subs too

4runnerman · May 17, 2015, 06:54 PM

velillen- I heard 5744 was the go to powder?. From what I can did up under loads it sees 110 and 1680 are the best choices. 5744 was all I could find also

Sharkbite · May 17, 2015, 06:55 PM

If its an AR pistol, then its good to go for port location. Size is probably ok as well.

The issue may come up with an odd weight bullet and less then the ideal powder.

Pistol length gas systems are more forgiving then carbine length systems. I never had great luck with 5744 and 208gn subs, but it might work for supers.

Powders that work better for me
H110/W296
4227
A1680

Mobuck · May 19, 2015, 07:45 PM

I did a test load last week using H-110 and Hornady 190HPBT at barely super sonic. Using a 12X optic, I got a 3 shot cloverleaf out of my first group. That upset me and the rest were "slightly" bigger. I'll just say "pretty nice accuracy". I'm going to try Lil-Gun before loading more than just a few to play with.

4runnerman · May 19, 2015, 09:28 PM

Mobuck thats great shootig. I have had no luck with those powders around here. All I can find is 5744 for now. I heard 110 and 1680 are great powders for it.

Before I forget again-Case life?. With such a small shoulder these cases must be good for a lot of reloads. How many are you guys getting?.

tcoz · May 21, 2015, 08:57 PM

I shoot 147 and 150gr all day every day. MOA on a good day and 2 MOA on other days.

psalm7 · May 22, 2015, 10:10 PM

Powder has been a problem for me with the .300 BO . Im getting alot of brass acumalated by buying the Remington green and white box 120 grain at Walmart and having fun shooting it and using the brass . Sofar the Remington brass has been stamped Barns .

4runnerman · May 23, 2015, 02:08 PM

psalm7- I just did the chop saw at Habor Freight and cut 2000-223 cases down.
To all First off I am a dedicated Bench shooter with a SCOPE. Had to get that out.
k made first run to the range today with NO Scope. I had 50 rounds with 168 Serria Match and 50 rounds with 125- Speer. Both shot very well. At 50 yards I managed to keep the rounds in a 2 inch group. For me and no scope that is unheard of. Sent some pics to the boss ( his gun). Told him-- With a scope this thing will probably shoot real nice. I must admit it was kinda fun to shoot that thing. I put that adjustable front and rear sight you get when you buy a SW MP15 22. Once I got it set at 50 yards it just kept putting them in a very nice group. I am tempted to take the scope off my 22-250 and head back tomorrow and see what it will do.

Question- While 50 yards is not that far, I did notice this
168 Serria- 16.7 gns A5744
125 Speer- 18.9 gns A5744
At 50 yards I had same POI on both loads, Taking into consideration open sights and me not being worth squat with open sights I would have thought a bigger difference then that.

May 17, 2015, 06:21 PM	#3
4runnerman Senior Member Join Date: January 16, 2010 Location: Minnesota Posts: 3,577	Thanks Shark. It's my bosses. I think he said it was the pistol version?. It's an AR, but man is that baby short. Has this stock on it with a velcro strap to velcro it to your arm right above the wrist. __________________ NRA Certified RSO NwCP- Performance Isn't Optional

May 17, 2015, 06:54 PM	#5
4runnerman Senior Member Join Date: January 16, 2010 Location: Minnesota Posts: 3,577	velillen- I heard 5744 was the go to powder?. From what I can did up under loads it sees 110 and 1680 are the best choices. 5744 was all I could find also __________________ NRA Certified RSO NwCP- Performance Isn't Optional

May 19, 2015, 09:28 PM	#8
4runnerman Senior Member Join Date: January 16, 2010 Location: Minnesota Posts: 3,577	Mobuck thats great shootig. I have had no luck with those powders around here. All I can find is 5744 for now. I heard 110 and 1680 are great powders for it. Before I forget again-Case life?. With such a small shoulder these cases must be good for a lot of reloads. How many are you guys getting?. __________________ NRA Certified RSO NwCP- Performance Isn't Optional Last edited by 4runnerman; May 19, 2015 at 09:38 PM.

May 21, 2015, 08:57 PM	#9
tcoz Member Join Date: July 10, 2014 Location: Bluffton, SC Posts: 30	I shoot 147 and 150gr all day every day. MOA on a good day and 2 MOA on other days. __________________ "Never forget those who have died; Never forget who killed them." -Unknown

May 23, 2015, 02:08 PM	#11
4runnerman Senior Member Join Date: January 16, 2010 Location: Minnesota Posts: 3,577	psalm7- I just did the chop saw at Habor Freight and cut 2000-223 cases down. To all First off I am a dedicated Bench shooter with a SCOPE. Had to get that out. k made first run to the range today with NO Scope. I had 50 rounds with 168 Serria Match and 50 rounds with 125- Speer. Both shot very well. At 50 yards I managed to keep the rounds in a 2 inch group. For me and no scope that is unheard of. Sent some pics to the boss ( his gun). Told him-- With a scope this thing will probably shoot real nice. I must admit it was kinda fun to shoot that thing. I put that adjustable front and rear sight you get when you buy a SW MP15 22. Once I got it set at 50 yards it just kept putting them in a very nice group. I am tempted to take the scope off my 22-250 and head back tomorrow and see what it will do. Question- While 50 yards is not that far, I did notice this 168 Serria- 16.7 gns A5744 125 Speer- 18.9 gns A5744 At 50 yards I had same POI on both loads, Taking into consideration open sights and me not being worth squat with open sights I would have thought a bigger difference then that. __________________ NRA Certified RSO NwCP- Performance Isn't Optional

May 17, 2015, 06:15 PM	#2
Sharkbite Senior Member Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,679	Check out 300blktalk.com. Lots of load data there. You are correct...for supersonic ammo the 110-125gn bullets reign. Subsonics usually use 200+ grain pills You dont mention the platform you will be shooting. 5744 will work fine in a bolt gun. If running an AR its all about gas port location and size. I have loaded some 150gn supersonics. Only because the bullets were so cheap. 168's wont give you the speed the 110's will. The cartridge really is best at the two ends of the weight spectrum. Get on the other forum and read...its a cool cartridge within its limits.

May 17, 2015, 06:39 PM	#4
velillen Member Join Date: October 20, 2012 Posts: 93	I've shot plenty of the 147gr bullets and have had good accuracy. Get moa with them. I've used the 5744 since it was all I could find but I'm not to happy with it. Always up with unburned powder which obviously effects accuracy. But yes generally you see the 110 for supers and 200 plus for subs. Though I've heard of guys using 175 smk for subs too

May 17, 2015, 06:55 PM	#6
Sharkbite Senior Member Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,679	If its an AR pistol, then its good to go for port location. Size is probably ok as well. The issue may come up with an odd weight bullet and less then the ideal powder. Pistol length gas systems are more forgiving then carbine length systems. I never had great luck with 5744 and 208gn subs, but it might work for supers. Powders that work better for me H110/W296 4227 A1680

May 19, 2015, 07:45 PM	#7
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	I did a test load last week using H-110 and Hornady 190HPBT at barely super sonic. Using a 12X optic, I got a 3 shot cloverleaf out of my first group. That upset me and the rest were "slightly" bigger. I'll just say "pretty nice accuracy". I'm going to try Lil-Gun before loading more than just a few to play with.

May 22, 2015, 10:10 PM	#10
psalm7 Senior Member Join Date: March 7, 2014 Location: Middle TN Posts: 543	Powder has been a problem for me with the .300 BO . Im getting alot of brass acumalated by buying the Remington green and white box 120 grain at Walmart and having fun shooting it and using the brass . Sofar the Remington brass has been stamped Barns .