Brent, last week I chronographed seven 1.25 oz bismuth loads with 33.0 gr. Longshot in Cheddite hulls with the WWAA12R Claybusters equivalent wad and fold crimp for an average speed of 1381 fps+ 42 SD. I will reduce those by a grain or two.
I also experimented with lubed vs. unlubed vs. hard fiber wads in RMC brass, using 27.5 gr. Longshot, five shots each. The lubed wads produced higher mean speed with low variance compared to both hard and dry:
Lubed: 1287 + 30.4 SD
Dry: 1032 + 162
Hard: 828 + 230
However, in a second set of experiments with the same powder charge, I got the following results:
Lubed: 1183 + 67
Hard: 1139 + 26
I try to be consistent in loading technique, but as I am wholly self taught, the inconsistency in results suggests I am not doing very well. I don't know why I got 100fps difference in the lubed wads between the two sessions, nor why the hard wads were so much more consistent the second time. The chronograph had been repaired between sessions; dunno if that might account for some of the difference.
Any advice gratefully accepted.
Last edited by LGF; 10/06/20 05:09 PM.
