Cfe blk

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Has any of you use the powder with a 123 gr bullet in 7.62 x 39? Do you mind sharing your results? Thank you kindly.
 
I have some on order. I will be loading 123 grain Hornady SST bullets. Rifle is a 16" barrelled Ruger American Ranch. I will run some over the chrony and get back to this thread. It will be at least two weeks. Still winter here.

Darryl
 
CFE BLK update to my last post. 30 grains of CFE BLK, Lapua NEW brass, WW large rifle primer and 123 grain Hornady SST bullet. Ruger American ranch 7.62x39. 2550 fps. This was average over 10 shots with the Chrony 6 feet from the muzzle. 31 grains put it at 2650 fps. No pressure signs at all. NOTE and DISCLAIMER these loads are safe in MY rifle maybe not yours. They are not for SKS AK or AR platforms or other semi auto rifle in 7.62x39. I am very impressed with CFE BLK in the 7.62x39. Loads from Rifle Shooter magazine. on the web search CFE BLK in 7.62x39. Test rifle in that article was a Howa mini in 7.62x39 of course. Strange the test rifle had a 20" barrel compared to the short pipe on the Ruger. Minimal effect on velocity due to barrel length. Thought I would update as I said I would.
Darryl
 
When the first one went over the Chrony I stopped everything and checked for pressure signs and issues with the Chrony. Cases looked fine with no heavy bolt lift or extraction issues. I know these are not the best way to detect pressure but it is what I have to work with. I ran a string out of my .303 British (174 grain) to check the chrony and the readings were bang on. The real surprise was the 31 grain load . I have always considered the 7.62x39 a decent deer cartridge (used within it's limits) but these results enhance that. I made another batch but changed the bullet to the 123 grain PRVI PSP. I am not sure if the SST will stand up to deer hunting at the noted speeds. If anyone has used the 7.62x39 123 grain SST at higher velocities I would like to know the results. i.e.: in the .303 British .

Darryl
 
I bought a pound for use in 7.62X39. CFE Blk has a Burn Rate and density that's optimal for max MV's in the 7.62X39 in the commonly used bullet weights, and that's its attraction to me.
 
I read another article about how barrel length effects velocity in the 7.62x39. It seems from that test (26" barrel cut 1" at a time and velocity recorded) that the 7.62x39 is the least effected of all or most cartridges. The author indicated the optimum barrel length in the 7.62x39 is 16". CFE's burn rate really suits this chambering.

Darryl
 
How is "optimum barrel length" defined?

Cartridges with lower "expansion ratios" (ratio of case volume to bore volume) are less affected by barrel length than those with high expansion ratios e.g. 45-70 vs. 264 Win Mag. 7.62X39 is on the low side but hardly the lowest.
 
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The 123 grain SST will stand up to the velocities you mention. It won't go much beyond that though. There is another thread on here somewhere where someone was loading some crazy loads in a Ruger #1 and the bullet held in there.
 
Andy said:
How is "optimum barrel length" defined?

Cartridges with lower "expansion ratios" (ratio of case volume to bore volume) are less affected by barrel length than those with high expansion ratios e.g. 45-70 vs. 264 Win Mag. 7.62X39 is on the low side but hardly the lowest.
Click to expand...

I believe the author was defining "optimum" as 16" being the shortest before any real effect on the cartridges abilities for intended purposes was observed. IIRC this article was aimed toward the semi auto rifle scene i.e. AR AK 47 etc.

Darryl
 
Did some testing with CFE BLK and Hornady interlock #3140. I settle with 28.5 gr that yield on average 2485 fps with Prvi Partizan brass and CCI 200 primer. The rifle is an Howa 1500 with standard barrel, the ambient temperature was 10° Celsius when tested.
 
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