Thread: Getting ES down with 223

Same load (55gn Gold Dot, 26gn 8208, 2.300") tried with different brass:

PPU (fireformed, annealed, FL sized, trimmed, uniformed)
3245
3265
3293
3268
3293
3282

Starline (same treatment)
3301
3337
3370
3329
3317
3322

Starline is lower capacity so the increase in speed was to be expected. Each group has an outlier. With PPU it was the 3245 cold bore shot. With starline, it was the odd 3370 shot in the middle of the string.

PPU: ES 48, SD 18.7, AVG 3274.
Minus outlier: ES 28, SD 13.3, AVG 3280

Starline: ES 69, SD 23.3, AVG 3329
Minus outlier: ES 36, SD 13.6, AVG 3321

Interesting how Lapua isn't performing that much better than PPU. Group sizes were comparable.

Also chrono'd some 300 blackout 110 VMax. Early stages of load dev, so not huge sample sizes. Starline brass and CCI 450's.

20gn AR2205 @ 2.100"
2335
2321
2344
2343
2362
ES 41, SD 14.9, AVG 2341

(next powder redacted because there's no load data whatsoever and it's a dangerously fast stuff. I want no responsibility of anyone trying the combo should it appear in some idiot's search results one day)
Secret sauce 2.050"
Xgn
2116
2119
2148 (case had a flattened primer and later on wouldn't fit into a shell holder so has been discarded)
ES 32, SD 17.7, AVG 2128

X+0.5gn
2169
2174
2180
ES 11, SD 5.5, AVG 2174

X+1gn
2216
2220
2226
ES 10, SD 5.0, AVG 2221

I find this interesting because Starline's 300 blackout and 223 brass is formed from the same basic case. With 300 blackout, right off the bat, I'm getting low double digit ES and single digit SD's (in an even smaller case nonetheless). With their 223, not so much...

I think next step is to do that primer shootout with 223.