I have long since wanted to know what to use to get the best results from my 10.5" SBR. Because of that I have been running some tests of my own.
All of this data is obviously for MY GUN but in general all loads are within safe published load data (with one exception so far).
I have several thousand 75 grain Hornady bullets that I bought a long time ago. I am shooting them out of a 10.5" SBR.
A load of 24.8 (?) grains of CFE 223 gave me fps.
A load of 23 grains of H335 gave me a velocity of fps.
A load of 25.5 grains of Leverevolution gave me a velocity of fps.**
** As far as I know there is no published load data for 223 using Leverevolution. That said Johnny's Reloading Bench made a video using Lever and 77 grain bullets so I extrapolated out of that video. I probably could have gone up even higher in charge weight but it was pointless as it could not catch up to other contenders that I've tried.**
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A load of 24.1 grains of Ramshot TAC gave me a velocity of fps. This is the max published load on Hodgon's website. This is over 90 fps faster velocity than the next closest competitor (so far). I could probably go up in charge weight even more in my gun but I rarely exceed max. That said I might try to keep going just to see what it yields.
Hopefully this will be an ongoing test but powder availability is still a problem. None the less at the very least I have at least one powder on the menu that offers substantially better performance than the others out of that particular platform.
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I ran some more tests and it's definitely delivering. I did several more strings and the average from all of them was nearing fps. The highest single shot was over .
Based on what I am seeing this can easily be my new go to for that particular rifle.
Posted: 8/30/ 8:09:01 PM EDT
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Good evening everybody.
Received in an 8lb jug of Shooters World SBR-SOCOM last week and put a few rounds over the chrono this afternoon.
Beautiful day in Maine today: 65degF, low humidity, mostly sunny but gusty winds kept shoving the chrono around but learned to anchor the tripod legs quick enough.
Data is rather sparse for SW SBR-SOCOM and the jug has .458SOCOM as the only cartridge for data displayed on the jug. SW on-line data only has .458SOCOM and 300BLK.
SW promotional description specifically names 7.62X39 as a good cartridge to utilize this powder but I failed to find any data. SW's description places the SOCOM powder's burn rate
as slower than H110/WIN296 and faster than Accurate . A little bit of information but not a heck-of-a-lot. SW's burn rate chart puts SBR-SOCOM on the same line as IMR
and VV120, again, not a whole lot to work with.
Using data from Speer and Sierra I managed to find starting points for both 300BLK and 7. using a 125gr Speer .308 TNT bullet. Let the fun begin.
Decided to get a lot done all at once by trying a new 300BLK build using a cheap-o CBC Industries 16" SS HBAR, think I paid $89.00 a few years ago. The rifle also got fitted with
a new Trigger Tech trigger with a a really sweet feel. And also getting used to the new chronograph.
For sight-in and chrono set-up I grabbed a handful of Palmetto State Armory 300BLK remanufactured stuff, 125gr FMJ.
5 rounds of PSA Remanufactured 300BLK 125gr FMJ:
1.)
2.)
3.)
4.)
5.)
To set a base-line I used 5rds of H powder and weight sorted 125gr bulk .310 Commie FMJ surplus bullets that I've had really good luck with accuracy wise. Sized to .308.
18.5gr of H
125gr Bulk Surplus FMJ sized from .310 to .308
Win .223 brass cut and formed on its 3rd or 4th firing
Fed 205M
C.O.A.L. 2.039
1.)
2.)
3.)
4.)
5.)
Average Velocity = fps
No signs of pressure and all rounds cycled normally.
Shooters World SBR-SOCOM uses a 125gr Sierra PSP bullet unstated primer and barrel length starting charge 16gr = fps and max charge of 21gr = fps = psi.
My 16" barrel and 5rds of 18.5gr of SBR-SOCOM:
18.5gr SBR-SOCOM powder
125gr Commie bulk surplus .310 weight sorted and sized .308
Win 223 brass cut and formed on its 3rd or 4th firing
Fed 205M primer
C.O.A.L. 2.
1.)
2.)
3.)
4.)
5.)
Average Velocity = fps.
Primers were a bit more flattened than the H load but nothing not completely normal for Federal primers, no ejector marks nor bolt wipe marks.
Recoil was snappier with 18.5gr of SBR-SOCOM powder over the H and the added velocity makes that very understandable.
Pleasantly surprised that the new SBR-SOCOM also provided a considerably tighter group over the H load, very nice.
Also had on the table an old favorite load to try in the new 300BLK rifle:
19gr IMR powder
110gr Hornady Z-Max .308 tipped bullet
Lake City brass cut and formed on its 3rd or 4th firing
Fed 205M primer
C.O.A.L 2.049
1.)
2.)
3.)
4.)
5.)
Average Velocity = fps
This load has clover-leafed in many 300BLK rifles and the CBC also shredded one hole.
Now on to the 7.62X39.
16" 7.62X39 HBAR generic nitride purchased 8 years ago off GunBroker but it does shoot.
Decided to use Speer 125gr .308 TNT bullets, got a nice stash.
Again a base-line powder used was H at 25gr. Hodgdon 7.62X39 starts H under a 125gr Speer PSP at 24.5gr and maxes-out at 26.5gr at 40,400 cup.
25gr H powder
125gr Speer TNT bullet
Lapua brass
Win Large Rifle Magnum primer
C.O.A.L. 2.225
1.)
2.)
3.)
4.)
5.)
Average Velocity = fps
No pressure signs of any kind, cycled normally.
25gr SBR-SOCOM powder
125gr Speer TNT bullet
Lapua brass
Win Large Rifle Magnum primer
C.O.A.L. 2.225
1.)
2.)
3.)
4.) wind shifted chrono
5.) wind shifted again
Average Velocity = fps
Brass showed no pressure signs of any kind and group on target looked very good.
Being very stoked by the new well behaving powder I decided to try a couple more recipes:
25gr SBR-SOCOM powder
125gr Speer TNT bullet
Lapua brass
Fed 210M primer
C.O.A.L. 2.225
1.)
2.)
3.)
4.)
5.)
6.)
7.)
8.)
9.)
10.)
Average Velocity = fps
Minor pressure signs included very slight ejector mark and the Federal primers flattened a bit but nothing out of the norm. Cycled normally. Really sweet 10rd group.
25gr SBR-SOCOM powder
125gr Speer TNT bullet
Mixed brass
Win Large Rifle Magnum primers
C.O.A.L. 2.225
1.)
2.)
3.)
4.)
5.)
6.)
7.)
8.)
9.)
10.)
Average Velocity = fps
Primers not as flat as the Federal primers but still saw very slight ejector marks and very light bolt wipe. Group size same as the Fed210M primers, very nice.
25gr SBR-SOCOM powder
125gr weight sorted Commie bulk FMJ .310 bullet
Mixed Brass
Sellier & Bellot Large Rifle Magnum primer
C.O.A.L. 2.183
1.)
2.)
3.)
4.)
5.)
Average Velocity = fps
No pressure signs at all on the brass. Cycled normally. Shredded a nice tight clover-leaf. Love those old Commie bullets and a bit disheartened that I can't find them any more.
Conclusion:
Shooters World SBR-SOCOM powder physical shape is much like Accurate , it meters great.
18.5gr under a 125gr Speer TNT yielded a velocity that came right in line with the manufacturer's data and proved very accurate. Providing 200+fps over H suggests the new
SBR-SOCOM powder is better suited to 300BLK than H.
And in the 7.62X39 I see the SBR-SOCOM outperforming the classic AA . Accurate's data gets a 125gr Sierra PSP bullet to fps with a max charge of 27.7gr and 51,238psi of
pressure out of a 21" barrel. Shooters World SBR-SOCOM powder got a 125gr Speer TNT bullet to fps with only 25gr of powder and a 16" barrel and it would be interesting to
what ejector and bolt wipe marks look like with 27.7gr of AA .
Very impressed with Shooters World SBR-SOCOM powder.
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