CFE 300 BLK first thoughts update 1/28/17

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dellet
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by dellet »

I wonder if this powder is also temp sensitive?
300 Blackout, not just for sub-sonics.
johnhefley
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by johnhefley »

dellet wrote:I wonder if this powder is also temp sensitive?
I hope not!!! I'm a pretty simple sum'bitch. I'm not sure I can cope with more variables!!!! :lol:

I'm sticking with the theory that deeper seating of the bullet is the culprit.

jh
Alphawolf082
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by Alphawolf082 »

Great info on here as always.

Welcome johnhefley. Sounds like you'll fit right in, especially if talking to Rebel didnt scare you off! :mrgreen:
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dellet
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by dellet »

johnhefley wrote:
dellet wrote:I wonder if this powder is also temp sensitive?
I hope not!!! I'm a pretty simple sum'bitch. I'm not sure I can cope with more variables!!!! :lol:

I'm sticking with the theory that deeper seating of the bullet is the culprit.

jh
I was wondering more about the ES getting worse than better. The velocity was more or less expected.
300 Blackout, not just for sub-sonics.
johnhefley
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by johnhefley »

Rebel was very nice to me in our PM exchange.

To Dellet: I can't account for the ES today. In a couple of days I'll load up another batch at either 10.5 or maybe even 10.3 grains. I'm determined to develop a good subsonic load with this powder. I just need to keep probing around until I hit on the right combination.

jh
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dellet
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by dellet »

johnhefley wrote:Rebel was very nice to me in our PM exchange.

To Dellet: I can't account for the ES today. In a couple of days I'll load up another batch at either 10.5 or maybe even 10.3 grains. I'm determined to develop a good subsonic load with this powder. I just need to keep probing around until I hit on the right combination.

jh
I'm going to try a couple heavier bullets this weekend. Probably a 240 SMK and a very heavy cast.

It has reasonable spreads loaded as a super, so we'll see.
300 Blackout, not just for sub-sonics.
johnhefley
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by johnhefley »

My rifle is out of commission for a couple of weeks. Minor problem requiring return to the manufacturer. :cry:
jh
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rebel
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by rebel »

johnhefley wrote:Rebel was very nice to me in our PM exchange.

To Dellet: I can't account for the ES today. In a couple of days I'll load up another batch at either 10.5 or maybe even 10.3 grains. I'm determined to develop a good subsonic load with this powder. I just need to keep probing around until I hit on the right combination.

jh
Thanks for the kind words John. Alphawolf is "from here", I took him shooting at my range and he came away knowing a redneck army will shoot your ass off :mrgreen: He's a fine young man and just giving me a bit of sh$t. Besides he is responsible for keeping the lights on for millions - I cut him a bit of slack :lol:
You can't beat the mountain, pilgrim. Mountains got its own way.
johnhefley
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by johnhefley »

We're ALL part of a Redneck Army!!! :lol:

Sometimes the fragile, sensitive little snowflake inside of me trembles in fear at my own "arsenal of weapons" and "massive cache of ammunition"!!

Makes me wanna report myself!!!!! :lol:
jh
johnhefley
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Re: CFE 300 BLK first thoughts update 1/28/17

Post by johnhefley »

Gents, apologies for taking nearly a year to update my little science experiment!!

I'm narrowing in on what appears to be a pretty nice subsonic load. Basically, from my last effort, I've just reduced from 10.8 gr. to 10.5 gr. of 300 BLK powder.
I believe the powder is under just a slight bit of compression.

The rounds cycled perfectly, and consistently. Accuracy at 100 yards (using a 3X fixed magnifier) was quite good. I was mainly out to check the MV's. I wish I'd
mounted an optic with more magnification so that I could zero in a bit better.

The rifle:
Hardened Arms 300 BLK 10.5" barrel (pistol length gas tube) and welded and pinned 7" "Widow" suppressor.
Vortex Spitfire Prismatic 3X optic
Geissele SSA-E Trigger

Here's the load:
Hornady VLD-X 212 gr.
CCI Magnum Small Rifle Primers No. 450
10.5 gr. CFE BLK
2.181" COAL
1.46" Base to Ogive

It was a 55dF day, so the Speed of Sound was 1112. I fired 15 rounds, and noticed in the last 5 rounds I had a couple that were a bit faster than all of the others.
I'm ASSUMING that during my weighing/trickling process that some extra powder might've clung to some case lube in the casings on those two. I can't blame the powder. I expect it was "reloader error".

1013
1011
1020
1010
1033
1027
1025
1036
1007
1027
1024
1027
1054
1028
1051

Average MV = 1026
ES = 47. (If you don't count the 1051 and 1054, it's 29)
SD = 13.2
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