300 blackout load data...Lee 155

waco

Springfield, Oregon
I have the Lee 155gr mold. Seems to be a pretty popular one for supers in the 300.

My rifle is a Ruger Ranch. I would love to hear what powders are working best for you guys.

Any starting points would be great too. Having a little trouble finding cast data.

Thanks much, Walter
 

Brad

Benevolent Overlord and site owner
Staff member
I need to get my chrono data and see what I used. H110 is never a bad choice and 1680 is awesome. I will take a look tomorrow and let you know.
 

waco

Springfield, Oregon
Thanks Brad. I have H110, never used 1680. Read a bunch about it. Looked for it a Cabelas tonight. No dice.
 

Brad

Benevolent Overlord and site owner
Staff member
I got a hell of a deal on some a few years back even though I had no use for it at the time. I paid 10 bucks a pound! Mine is surplus powder but uses 1680 data.
 

300BLK

Well-Known Member
Start around 15gr with 4227 and work up. 15.8gr H110 chrono'd 1920fps from my 16" with the bullet crimped into the first driving band. MP300 will work and takes a little more powder than H110. Honestly, I think 4227 and H110/296 to be the ideal powders for that bullet.
 

Josh

Well-Known Member
Wow, 1920 FPS with only 15.8 gr of H-110? That is excellent, my 155's weight in at 160-165 gr, if I couple H-110 with the 312440 it will make an amazing load for my little girl this deer season.

Here I was thinking the 160 gr class bullet was going to be a 1650-1700 FPS load. How was accuracy @300BLK
 

300BLK

Well-Known Member
My Lee "155s" weigh 160gr w/GC and lube. 15.8gr H110 seemed to be the most accurate with that powder in my 16" barrels with ragged hole groups at 50 yards and maybe 1.5moa at 100 (8" twist AR platform). I didn't chrono 15gr 4227, but it was accurate in my 10" pistol, and still looked good in my 16" despite crimping in the crimp groove (necessary to chamber in the pistol). I know another guy running 16gr or more of 4227 with no pressure issues. Expect to see some pressure signs (like ejector swipes) when running 17+gr MP300. I never pushed 4227 or H110 to see where the limits are, but 17.5gr MP300 will swell primer pockets. I use RP 7-1/2s exclusively.

Realize that my accuracy is a relative thing in that I'm running low magnification optics AND functioning in SA mode with M4 ramps. I see no need for more than 6x, usually less, on an AR. Red Dots can be accurate IF your aiming point is a bit larger than your dot so as to have concentric circles.

I don't have a 300BLK boltgun or SS, but think they would be good platforms to experiment with more bullet weights and different powders. I have listened to 300BLKs (subs)from BAs with cans, and the bullet impact makes more noise than the muzzle report.
 
Last edited:

Ian

Notorious member
Wow, 1920 FPS with only 15.8 gr of H-110? That is excellent, my 155's weight in at 160-165 gr, if I couple H-110 with the 312440 it will make an amazing load for my little girl this deer season.

Here I was thinking the 160 gr class bullet was going to be a 1650-1700 FPS load. How was accuracy @300BLK

I like the way you're thinking there......
 

KHornet

Well-Known Member
The strancg thing about that 155 lee (mine weigh 60-61) is that they seem to shoot very well in all of my 30's.
 

waco

Springfield, Oregon
The strancg thing about that 155 lee (mine weigh 60-61) is that they seem to shoot very well in all of my 30's.
I know my .308 likes the Lee 155. I'm going out Saturday but only putting those J words through the gun. I know, I know........
I need time to cast and empty some of this brass!
I'll let you guys know hoe the REM 150gr PSP over 14.5gr of Lilgun did.
 

Josh

Well-Known Member
I like the way you're thinking there......
There is something about that flying coke can I just like, not only does it like to go fast it hits like a train. I gave some of those to my old man, he loaded them into a 30-30 and wasn't expecting much, 5 "bang flops" later he wanted a coffee can full.
 

stlg67

Southeast Texas
My Lee "155s" weigh 160gr w/GC and lube. 15.8gr H110 seemed to be the most accurate with that powder in my 16" barrels with ragged hole groups at 50 yards and maybe 1.5moa at 100 (8" twist AR platform). I didn't chrono 15gr 4227, but it was accurate in my 10" pistol, and still looked good in my 16" despite crimping in the crimp groove (necessary to chamber in the pistol). I know another guy running 16gr or more of 4227 with no pressure issues. Expect to see some pressure signs (like ejector swipes) when running 17+gr MP300. I never pushed 4227 or H110 to see where the limits are, but 17.5gr MP300 will swell primer pockets. I use RP 7-1/2s exclusively.

Realize that my accuracy is a relative thing in that I'm running low magnification optics AND functioning in SA mode with M4 ramps. I see no need for more than 6x, usually less, on an AR. Red Dots can be accurate IF your aiming point is a bit larger than your dot so as to have concentric circles.

I don't have a 300BLK boltgun or SS, but think they would be good platforms to experiment with more bullet weights and different powders. I have listened to 300BLKs (subs)from BAs with cans, and the bullet impact makes more noise than the muzzle report.
I just got done casting some 155g and 160g with the Lee molds. I already load 300 blackout copper jacketed bullets and with your information, I'm looking forward to working up some loads. Each bullet is powder coated and planning on trying a few with and without gas checks to see the best accuracy.
 
I tried the purpose built 200-220 gr 300 B/O bullets from Lee and NOE molds. PCed and lubed in my suppressed 300 B/O AR15. Neither could hold 3 moa whereas several jacketed of the same weight could do 1 moa. Gonna shoot cast in my SS and bolt guns where I can count on fine results.
 

Ian

Notorious member
I tried the purpose built 200-220 gr 300 B/O bullets from Lee and NOE molds. PCed and lubed in my suppressed 300 B/O AR15. Neither could hold 3 moa whereas several jacketed of the same weight could do 1 moa. Gonna shoot cast in my SS and bolt guns where I can count on fine results.

I can't seem to make the Lee 230 NOT shoot 1.5 MOA or better out to 100 yards from any of my three suppressed AR-15s. All I do is powder coat them, run them through a .309" Lee sizing die, and load to magazine length on top of 10.4 grains of Alliant Reloder 7. I'm not even using my usual preferred Forster Benchrest straight line seating die, just a regular RCBS seater, and I put a light roll crimp on while seating. The bullet doesn't seem to be picky about alloy or anything else. Care to share your process and maybe I can help?

Here are some 50-yard groups shot with a Bushnell TRS-25 3-MOA red dot sight and 16.25" shrouded barrel having about 8" of rifling in it and pistol-length gas.
 

Attachments

  • 20181104_211145.jpg
    20181104_211145.jpg
    217.3 KB · Views: 17

fiver

Well-Known Member
that lee 230 shoots fine for me too, at real super sub speeds it's awesome out to 50yds.
i ain't messed with it at 100 because i'm pretty sure it just falls to the ground at 60 or 65yds.
maybe i should speed it up a little and see if i can't get it to drop to the ground at 102yds?
 

Ian

Notorious member
At 1030 fps and a +1.5" 100 yard setting mine will dink the bottom edge of a 12x20 steel silhouette 200 if I aim at the head. I think you could stand down there and catch them with a welding glove, though, I know for sure you can see them coming.
 

CWLONGSHOT

Well-Known Member
The LEE 230 was garbage in 5 different 300's for me. Aweful patterns W alot of side impacts.

I removed that boat tail

Now shoots as expected. Sub 2" 100 yards.

CW
 

stlg67

Southeast Texas
My Lee "155s" weigh 160gr w/GC and lube. 15.8gr H110 seemed to be the most accurate with that powder in my 16" barrels with ragged hole groups at 50 yards and maybe 1.5moa at 100 (8" twist AR platform). I didn't chrono 15gr 4227, but it was accurate in my 10" pistol, and still looked good in my 16" despite crimping in the crimp groove (necessary to chamber in the pistol). I know another guy running 16gr or more of 4227 with no pressure issues. Expect to see some pressure signs (like ejector swipes) when running 17+gr MP300. I never pushed 4227 or H110 to see where the limits are, but 17.5gr MP300 will swell primer pockets. I use RP 7-1/2s exclusively.

Realize that my accuracy is a relative thing in that I'm running low magnification optics AND functioning in SA mode with M4 ramps. I see no need for more than 6x, usually less, on an AR. Red Dots can be accurate IF your aiming point is a bit larger than your dot so as to have concentric circles.

I don't have a 300BLK boltgun or SS, but think they would be good platforms to experiment with more bullet weights and different powders. I have listened to 300BLKs (subs)from BAs with cans, and the bullet impact makes more noise than the muzzle report.
This is probably a dumb question, but I was wondering what you BHN is on your bullets?