Been dark on here for a bit. Still putting rounds down range though. So far I've shot 1000+ of these cases in 223 bolt, gas & 300bo gas.
I originally wanted to try it for gas gun lost brass matches.
Been very impressed with these cases. Very consistent weight & size. I've yet to find one with a dented neck.
They have more head space then I'd like .008-.009 in 3 of my 223W. They have more neck tension than I'd prefer & I need a .2245 to have any effect on reducing tension. With .2235 you can barely feel it touch. Lot of spring back on these. Case necks are as thick or even a few 10ths thicker than brass. I tried a Lee collet die for shits and the thick steel neck laughed at it. At 24 cents a pc there not worth screwing with as far as reloading. They also have a slight flare on the mouth to help load flat back projectiles. None of these gripes seem to have any negative affect on accuracy though. I do think SD's are suffering a little on the 223 with the high neck tension & it's not super consistent on seating pressure.
I just prime, dry lube the necks, load, & kiss it with a taper crimp just to close the flare.
Case capacity 223 Shell Tech:
un-fired case with spent primer installed measured on FX120 = 31.76 h20
Fired case with spent primer intact = 33.14 h2o
Yes you read that right. They gain 1.34 gr when fired. cases expand in length .015" avg. and diameter .0065" avg. at the back end by design. In other words most of the capacity gain is upon firing. This feature frustrates the load development programs like Gordon's.
My first 18" AR ladder I started with my MK262 clone load in brass as a baseline = 2755fps
I stayed under what I'd seen other people load to with the same powder for my top end load and it was still screaming fast.
Shell tech ladder went from 2841 - 2949 & the sweet spot seemed to be at 2922 both SD and accuracy. Worth mentioning that this proof CF barrel is on the faster end of the spectrum.
All the above loads were with same bullet/primer/powder/COAL. At the low end 2841 primers were a little more rounded on the shell tech cases vs IVI brass. At 2922 they looked the exact same. At 2949 the shell tech started to show a little more flattening, but still no cratering.
Sorry pic is kind of shitty but this is the 2922 load next to the 2755 load.
Someone up-thread mentioned meh gains & I don't disagree when using a meh bullet like 77smk.
It's dam impressive from a 16" gun if you run the numbers on a 77RDF .228 G7 though.
Another benefit I saw that I haven't heard mentioned. Someone else please do this to confirm. In my 10.5" Suppressed AR these shell tech cases ejected clean as shit, almost no carbon.
Here's 4 fired with 1 unfired. Not cleaned or wiped down. I don't know how to explain this but I like it. Gun runs much cleaner with these vs brass.
These bastards still have neck tension after firing.
The loads in the 10.5" were very impressive. I'd consider the powder I used to be pretty optimal for 10.5 in the below loads. i.e. full burn or very close to it in 10.5" The loads below were not the fastest, just what I settled on.
Baseline XM193 55gr brass = 2739
64gr Nosler bonded @ 2.179 COAL = 2820
62gr Fusion @2.245 COAL = 2846
73 eldm factory Hornady Match = 2340 SD32
73 Shell Tech cci 450 coal 2.290 = 2661 SD18 With a 3x behind the Huey this is murdering a 500y full size IPSC
For the hell of it I tried my 18" 77smk Shell Tech load in the 10.5" powder is too slow for 10.5", but still gave 2534 SD11.5
No gas adjustments for any of that.
These cases are fucking ridiculous in the bolt gun.
Tack Class. 77gr max wt & 3000 max speed.
Attempt #1 Epic fail & I still haven't tried down loading to get down to speed. Probably just stick with Lake City brass for Tac class.
26" 8T Short action Customs Bart. ARC Nuke 2.0
Baseline Tac load
Brass case 77DRF @ 2.436 205M AA2520 = 2990
Same bullet/powder/primer/coal in Shell tech. Not same charge since increased cap.
My starting load in Shell Tech = 3105 next 3124 fail
77TMK @ 2.433 205M = 3120 & 3136 fail accurate but way to fast.
With heavies, Holly Crap!!
Shell Tech 88 eldm @2.5"coal N550 = 2976 SD 3.0
85gr Meade @2.460 N550 = 3065 SD 5.9
With Gordon's I'm using the smaller un-fired case capacity and the above loads are predicting 62K. At the larger fired capacity it's 56K. That said across the board these cases are beating speed predictions for a given powder even at the lower cap input. Ashamed to admit I went one step higher on both those loads. No pressure indications that I could perceive, but I'll be dropping the 88's to 2950 & the Meade's or 85.5 Bergers to around 3000. Both of those shot very well. I really want to get the 85.5 Berger's working but those have been finicky for me.
The 300 BO with Shell Tech has been great with what I've tried. So far only heavy- ish projectiles. 155-174 supers.
8" or 8.5" barrel I forgot & 8T.
I don't have much factory ammo for a baseline.
Factory Hornady Black 110 Vmax is pathetic at 1419fps Southern munitions 110 Vmax is better 1712fps
Shell Tech
170 Norma Tipstrike @2.260" = 1722
174 eldm-vt @2.260" = 1640
155 TMK @2.260" = 1933 SD was from 1.7 - 4.9 Powder/bullet/cci450 are playing well together. Still has 775 ft-lb @300y hits steel hard.