LiveLife
Member
Discussion on a recent thread regarding the use of Pre-Resized brass reducing OAL variance triggered another myth busting thread.
For my USPSA match loads, I pre-resized brass to inspect primer pockets and cleaned as necessary. After hand priming the brass, reloading in progressive mode not only makes it silky smooth requiring little effort but with case feeder, very fast.
Test procedure:
Regular Reloading - Bullets were seated with all 3 stations full. OAL/COL sorted from shortest to longest:
Pre-Resized Brass Reloading - Resizing/depriming die removed from Station 1. All bullets were seated while flaring a case in Station 2. OAL/COL sorted from shortest to longest:
Summary - With RMR In-House 115 gr FMJ bullets and mixed range brass, I usually get around .005" OAL variance. Using same BLAZER headstamp brass produced .003" OAL variance while using pre-resized brass produced 001" OAL variance.
For my USPSA match loads, I pre-resized brass to inspect primer pockets and cleaned as necessary. After hand priming the brass, reloading in progressive mode not only makes it silky smooth requiring little effort but with case feeder, very fast.
Test procedure:
- BLAZER 9mm brass were resized and they ranged from .750" to .752".
- Five cases measuring .751" were selected
- Rocky Mountain Reloading In-House 115 gr FMJ
- Test rounds were loaded on Pro 1000 using Lee dies
- Frankford Arsenal dial calipers verified with Vermont pin gages
Regular Reloading - Bullets were seated with all 3 stations full. OAL/COL sorted from shortest to longest:
- 1.115"
- 1.116"
- 1.116"
- 1.117"
- 1.118"
Pre-Resized Brass Reloading - Resizing/depriming die removed from Station 1. All bullets were seated while flaring a case in Station 2. OAL/COL sorted from shortest to longest:
- 1.115"
- 1.115"
- 1.116"
- 1.116"
- 1.116"
Summary - With RMR In-House 115 gr FMJ bullets and mixed range brass, I usually get around .005" OAL variance. Using same BLAZER headstamp brass produced .003" OAL variance while using pre-resized brass produced 001" OAL variance.
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