WIN cases. Federal SPPs
All were 10 rd strings except the BRY 124HBRN 4.4 loads, that were just 5 rds.
Weather was partly cloudy. CE Pro-Chrono sky screens were on, temp about 90 degs and 65 deg dewpoint--humid. Intermittent gusty winds.
CSB-5 POWDER
BRY 124 HBRN: 1.135", seat .232"
Grs:.. 3.9...... 4.1.... 4.2...... 4.4 * (only a 5 rd string with this load)
AVG.. 1015.... 1037.. 1048.... 1058
ES .... 36....... 33...... 47...... 22
SD.... 11....... 9 ........ ? .... ?
PF.... 126...... 128.5.. 130.... 131
MG 124 JHP: 1.098", seat .228"
Grs:.. 4.2... 4.3
AVG.. 1057 1076
ES .... 35.... 32
SD.... 10.... 14
PF.... 132... 134.5
Zero125 JHP: 1.100", Seat .213"
Grs:.. 4.2... 4.3
AVG.. 1061 1073
ES.... 32.... 32
SD.... 7..... 9
PF.... 133-.. 134
I didn't see smoke. My CZ 75 Shadow was already dirty
. The recoil felt much like n320. The chrono target was at 7 yards with a 3" hole with 5 flyers after shooting all from a rest . The ejected cases looked completely normal. I'll look closer at these this evening when I sort all the cases I picked up.
Overall, I think this powder CAN work out okay, but it does fill the case enough to compresss a little with .1 grs higher loads than I tested. The Berry's seating depth was just slightly into the powder at 4.4 grains. I purposely didn't increase the oal to see what would happen.
A forum friend went to 1100+ fps with a linear progression in speed.
The CSB-5 small powder discs are VERY uniform in size and two discs laying flat will just fit into a WIN case flash hole. I saw that a few times as I handloaded to the powder weights shown for each rd. I was a little disappointed with the ES speed variations with each load. I can get better with my go-to powders, but that's not a biggy---I just worked hard to make these uniform loads.
For a shooting test I'll load some more using from 4.3 -4.4 and maybe some 4.5 gr loads for the RN bullets.