by Hoot » Sun May 23, 2010 9:34 pm
OK, so here's the summary on the 225 / Lil Gun experiments.
For five shots using Lil Gun, COL 2.15"
Just the taper crimp
Wt. 37gr 38gr
Vel 1 2325 2176
Vel 2 2171 2263
Vel 3 2313 2376
Vel 4 2252 2204
Vel 5 2265 Error
Avg 2265 2255
SD 61 89
taper crimp + 1 normal width FCD crimp off cannelures
Wt. 37gr 38gr
Vel 1 2190 2295
Vel 2 2278 2261
Vel 3 2323 2190
Vel 4 2292 2271
Vel 5 2197 2260
Avg 2256 2255
SD 59 39
taper crimp + 2 normal FCD crimps both off the cannelures
Wt. 37gr 38gr
Vel 1 2288 2168
Vel 2 2140 2134
Vel 3 2122 2165
Vel 4 2251 2313
Vel 5 2247 2160
Avg 2210 2188
SD 74 71
taper crimp + 2 narrow FCD crimps both on the cannelures. Required COL 2.08"
Wt. 37gr 38gr
Vel 1 2243 2260
Vel 2 2242 2294
Vel 3 2196 2269
Vel 4 2242 2317
Vel 5 2181 2296
Avg 2221 2287
SD 30 23
While applying two narrow crimps over the cannelures in the bullet tightened up the SD, I now believe Neck tension alone is not the solution.
Also, the two rather deep narrow crimps on over the cannelures opened the groups beyond what I've come to expect.
Control group using 37 gr Alliant 2400 with just the taper crimp.
I have 2400 loads done in the other 4 weight increments, but ran out of time.
Wt. 37gr
Vel 1 2316
Vel 2 2371
Vel 3 2303
Vel 4 2330
Vel 5 2340
Avg 2332
SD 26
I hope to get my hands on enough WSR primers to load up 4 sets of 5 shots or 5 sets of 4 shots of Lil Gun to see how significant the difference is between them and the BR4 primers. If you just go on accuracy alone, the Lil Gun does a stand-up job with the BR4 primers. I have a 100 yard target with 10 shots in a 2 inch group with 5 of those shots in the 1 inch bullseye. Kinda weird considering velocity extreme spread of 200 fps among those 10 shots. I guess at 100 yards, with 225gr bullets, that amount of speed change doesn't equate to much change in POI.
Hoot
In Theory, there is no difference between theory and practice. In Practice, there is.