Finally got some definitive (for me anyhow) results on the accuracy testing of my S&W 929 using various 9mm and 38sp bullets loaded into 9mm cases, and some 147gr 9mm rounds from a commercial reloader as a benchmark.
The net is, even with a 4X scope and shooting bench-rested, I am still the weakest link in testing accuracy. I found no meaningful difference between using 9mm and 38sp bullets. I could tell when a bad trigger pull pulled the scope off line and gave me a flyer.
Surprisingly the Campro 124gr HP gave excellent groups. I can`t say this is definitive with only a 2 target groupings, but I do intend to follow this one up work up some bullseye and steel shoot loads.
The only downside I can see from shooting 9mm bullets out of my 929`s is that it does not efficiently use the powder charge as there would be blow-by of gasses between the .355" bullet in the .357" cylinder throat. I did measure a 80fps decrease in speed between my Grand Power X-Calibur and my 929.
Here's some details on the test I ran and pic's of the targets.
Handgun - S&W 929:
· New, unmodified.
· 4lb 7oz SA/ 11lb 6oz DA trigger pulls
· cylinder throats measured (slugged) @ .357", bore @ .356"
· 4x fixed power scope
Projectiles tested:
· 147gr Campro Round Nose Truncated Point (.355" @ various loads)
· 147gr Berrys Round Nose (.355 @ 130pf load)
· 124gr Campro Hollow Point (.355" @ light bullseye load)
· 158gr Berrys Round Nose (.357" @ various loads)
· 148gr Berrys Hollow Base Wad Cutter (.357" @ various loads)
· Custom Reloading Services (commercial reloads) 147gr Round Nose Flat Point
Testing Method:
· gun supported on bench on top of case
· all shots fired in SA
· 2 groups of 8 shots fired for each type/load
· all groups shot at 17m, indoors.
Test Target #1
1. 158gr Berrys RN, N320 @ 2.8gr
2. 158gr Berrys RN, N320 @ 3.0gr
3. 158gr Berrys RN, N320 @ 3.2gr
4. 158gr Berrys RN, N320 @ 3.4gr
5. 147gr Campro RNTP, N320 @3.5gr (my 132PF semiauto load)
6. 147gr Campro RNTP, Titegroup @ 3.6gr (my revolver 132PF load)
Test Target #2
1. 148gr Berrys HBWC, N320 @ 2.8gr
2. 148gr Berrys HBWC, N320 @ 3.0gr
3. 148gr Berrys HBWC, N320 @ 3.2gr
4. 147gr Campro RNTP, N320 @3.1gr
5. 124gr Campro HP, N320 @ 3.6gr
6. 147gr Custom Reloading Services
