AustinL911 Posted April 13, 2012 Share Posted April 13, 2012 I recently started loading up some rounds for my new production gun (G34). The starting load I chose was 124gr Rainier TMJs seated to 1.125-1. 30" over 4.3gr of Bullseye (its what I had on hand...) with just enough crimp to remove the flare. I set my Chrony Beta Master about 3' in front of my bench and fired 10rd. Avg velocity = 1230. Obviously way too fast. So, I loaded up some more @ 3.9gr and repeated the same test. Avg velocity = 1260. So I'm a bit confused. Is the chrono picking up on the muzzle blast instead of the bullet? I also noticed the cases on the 3.9gr load were quite a bit dirtier than the 4.3gr load, so I assume they aren't sealing as well. And finally, I noticed that the 3.9gr load had a tendency to barely eject the round and sometimes threw it onto my left shoulder. Odd. Thoughts? Link to comment Share on other sites More sharing options...
gng4life Posted April 13, 2012 Share Posted April 13, 2012 The distance to your chrony sounds too close. All the chronos I have used is usually 10-15 feet away from the muzzle. So pull back some and try again, I am sure the results will be much better. Link to comment Share on other sites More sharing options...
Doc Hunter Posted April 13, 2012 Share Posted April 13, 2012 Too close - muzzle blast will throw readings. Link to comment Share on other sites More sharing options...
Sarge Posted April 13, 2012 Share Posted April 13, 2012 Agreed. The dirty case is probably from low pressure not expanding the case any if at all. Link to comment Share on other sites More sharing options...
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