06-12-2023, 05:23 PM
Lemonaid Wrote:The other minus for using 7.62x39 brass is the cost of a separate load development. A plus is that if you have lots of LR primers you can still shoot if SR primers are hard to get.
My pluses are:
1. I have a large supply of 7.62X39 brass and only one rifle left in that caliber
2. Retired, so have the time to reform
3. Basic chintziness keeps me from buying new brass when I can reform from a large stockpile
I have a good supply of LR and SR primers so that isn't the issue.
Went out this morning and tried a different, lighter load. I use it for plinking and fun. It consists of a 120 gr bullet (Barnes MBs in this case) and 22 gr of DP2200, all in reformed brass. This time the velocities were roughly the same, around 2050 fps. Shot 5 3 shot groups at a moderate pace without any bbl cool down. The first 3 shots were using SR brass and the next four groups used LR brass. The groups measured 1.34", 0.225", 0.94", 0.90", and 1.14".
Don't have a clue what the almost 100 fps swing was caused by in the other loads....maybe my chrono had a hangover. It is encouraging that the primer size doesn't seem (at least a first blush) to make a difference in lower velocity rounds because that is what I intend to use the reformed brass for anyway.
Happy shooting y'all!