[Nathan Dively]

I load mine down to 1.05. I had cz p10 f’s and p10c that wanted lower seating depts for reliable use. I also tested them with chrono and found i get more consistent velocity at 1.05 seating depth vs. 1.08 out of a cz shadow 2

[Nathan Dively]

Vitahvuri 3n37
Rocky Mountain Reloading
124gr Multi Purpose Round/ Jacketed Hollow Point
1.09 OAL
.378 crimp
mixed brass & mixed primers

3n37 min 6.1 max 6.4
5.2 gr CZ-P10F
978 1013
1000 1026 Average 1016.3
1034 1057 Standard Dev 21.09265275
1019 1005 Power Factor 126.0212
1010 1021
Used factory recoil spring. Probably better feel with 15lb spring.

5.5 gr
1042 1064
1050 1034 Average 1059.4
1057 1066 Standard Dev 14.5311925
1066 1069 Power Factor 131.3656
1085 1061
Extremely accurate
factory recoil spring great return to zero
15lb recoil spring solid return to zero

5.8 gr
1085 1187
1109 1140 Average 1129.5
1110 1122 Standard Dev 36.14553914
1103 1106 Power Factor 140.058
1194 1139
Great groupings.
Bouncing on return with factory recoil spring
Harsh recoil with 15lb recoil spring but great return to zero

6.1 gr
1156 1191
1170 1149 Average 1166.1
1175 1161 Standard Dev 12.19699417
1159 1174 Power Factor 144.5964
1169 1157
Supremely accurate
Harsh recoil
returns to zero well with factory recoil spring.
Do not use lighter recoil spring

[Author]

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