The evolution of the 300 Blackout - great day at the range with Blackarc Munitions and Hornady

[Bantam1]

I have been looking at these cases for other calibers. Just to clarify, loading them you are using the same powder as normal, just increasing the charge weight?

 

[357Max]

I have been looking at these cases for other calibers. Just to clarify, loading them you are using the same powder as normal, just increasing the charge weight?

Yes at least for the powders I was already using.
5.56 AA2520/TAC/N540
300 BO N110/SBR Socom
308 RL-15.5/PP2000/Varget/N550

The little added capacity might open the possibility for some powders that would traditionally be to compressed. Example 223 loaded long for bolt gun N550 works great in these cases with heavy pills 85gr +

 

[WindstormSCR]

Ok those reloading the NAS3 cases, what are you using to crimp? I've been working on 9mm 147 supersonic loads for a PCC and the Lee factory crimper increases the OAL of the cartridge from where I had it set when I seated the bullet. An email to Lee had them stating their crimper does no work with the Shell Shock NAS3 cases.

From what I could find for the 9mm, it was the Lyman crimper with their carbide taper crimp insert. By the time you get done with the crimper die, carbide insert, shipping and tax, you're looking at $200. To crimp a case. So with 300 Blackout what's everyone using? I was able to use a Hornady bullet seater/crimper successfully on the 9mm stuff but it's not ideal IMO. I've always crimped in a separate step.

for the 9mm double check you aren't pushing the base apart when setting the very slight bell before seating. the 9mm has specialty dies required because of the construction.

I used the specialty dies with a redding carbide 3-die set for seating/taper crimp (PN 20515)

 

[WindstormSCR]

@91Eunozs could you do an H2O case capacity measurement for me on the 300blk SS cases? I'll be loading those in the next few months and wanted to set up a specific cartridge variant in QL for it.

 

[Ape_Factory]

for the 9mm double check you aren't pushing the base apart when setting the very slight bell before seating. the 9mm has specialty dies required because of the construction.

I used the specialty dies with a redding carbide 3-die set for seating/taper crimp (PN 20515)

I'm using the specialty S3 dies. Just trying to find a decent crimper that won't get chewed up running in a progressive for 9mm. For 300 Blackout, I'll likely just single stage those with the NAS3 cases. I have the regular Redding crimp dies for various calibers but not 9mm, and I moved on from the Redding taper to the Lee factory crimp dies and saw an accuracy improvement. Unfortunately those won't work with the Shell Shock stuff.

No one seems to sell the carbide version of their taper crimp die without buying the whole set though. Good racket! I may just splurge on the Dillon carbide set. I have the Dillon 308 carbide resizing die and it's pretty solid. Waited over a year for it too.

 

[91Eunozs]

@91Eunozs could you do an H2O case capacity measurement for me on the 300blk SS cases? I'll be loading those in the next few months and wanted to set up a specific cartridge variant in QL for it.

I don’t have any graduated cylinders that small, but will see if I can devise a way to measure it.

I could do a simple comparison; maybe by water weight?

I wonder if a small syringe would do?

 

[cas6969]

When AAC announced the 300 Blackout, I was an early adopter

I giggle a little every time I read that.

 

[MO Fugga]

I don’t have any graduated cylinders that small, but will see if I can devise a way to measure it.

I could do a simple comparison; maybe by water weight?

I wonder if a small syringe would do?

I use a kids medicine dropper. Interested in it's capacity myself, as my regular factory brass is consistently .3 grains less than converted 5.56. Makes a borderline max charge overpressure, all other things equal.

 

[91Eunozs]

I giggle a little every time I read that.

“Silver” lining is, if you say it in a “Whisper” it’s all good… LoL

OK, that’s really lame…even I groaned at that one. And it’s not even funny enough to be considered a dad joke…

 

[45-90]

338 ARC Imp over 3700 fps 16" AR15.... faster than anything in my old forgotten 300 blk which was over 2600 fps with 78 gr cq from Lehigh Defense....by over 1000 fps.
The world's fastest 338 ARC!
Fun to shoot. But does well with 300 gr SMK or Berger subs, and 300 to 350 Maker bullets, 6.5 twist in 338 ARC Imp.

 

[cas6969]

“Silver” lining is, if you say it in a “Whisper” it’s all good… LoL

(in truth it's older than that)

 

[WindstormSCR]

I don’t have any graduated cylinders that small, but will see if I can devise a way to measure it.

I could do a simple comparison; maybe by water weight?

I wonder if a small syringe would do?

just grain weight of water is the standard method with the case filled up so there is no water tension bump on the top

 

[db2000]

The evolution of 300 sub is 255gr Sub-X sized down to .308.
Seekins SP8
Garmin Zero
3/16/23
67F 16% 30.03 in

A1680 255 Sub-X (0.310) resized to 0.3080
GM205M
COL 1.3530
BTO 1.5780
COAL 2.128 approx
9.0 817, 910, 844 SD 47.8 won’t lock bolt
9.5 891, 876, 895 SD 10.0 won’t lock bolt
10.0 926, 907, 936 SD 14.7 won’t lock bolt
10.3 943, 947, 935 SD 6.1
10.4 978, 969, 937, 963, 935, 952
937, 962, 973, 950
10.5 962
10.6 999, 974, 948, 965, 958, 979
978, 1002 didn’t lock bolt