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Topics - MJeff23
I noticed this weekend that I have carbon rings on the shoulder of the brass, rather than on the necks. The ring isn't uniform around the shoulder, rather the ring is distorted. I've tried different bushings and mandrels with the same results. Also decreased the shoulder bump from .002 to .001 and to basically no bump. No changes in performance, accuracy or speed. I have a suspicion on the culprit, but would like to get some input from you guys.
For today, I had 12 H4350's hold overs (3X fired brass) from previous outing. Loaded 8 NEW brass. Loaded 20 Vargets in NEW lapua brass. When I got to the 3rd round, the first two shots were with the 3X fired brass & went a tad high. Next three were new brass and landed about 1 MOA low. My first thought was how in the hell did I do that. As I was waiting for barrel to cool, I realized the split in the brass. The next round of new H4350 landed in same MOA low. Varget's POI did not shift (rules out stupid shooter error).
During all the load development with both powders, I did not experience that magnitude of POI shift--I did zero the scope when I settled on the two loads. This was also the first time I shot brass with different loading cycles. I'm estimating that the virgin brass (shoulder about .004 to .005 shorter than the 3X fired brass) was stretching and reducing velocity. The Labradar would've verified If I'd only taken it with me.
Any ideas on the shift other than the stretch in brass? Thanks for your input!
I'm curious what average ES others have with 6.5CM. Am I chasing an impossible dream, or, do I need to keep digging?
Thanks for your time.
Tried to shoot a ladder test with Sierra 130 gr TMK's and Hornady 130 gr ELD's. My Labradar would not trigger or record suppressed rounds this weekend.
With Sierra 130 gr TMK's, it would not trigger or record when suppressed. It did trigger & record once, but the recorded velocity could not have been correct. It would trigger unsuppressed, but would not record (I would get error message it could not acquire the projectile). I checked and re-checked the unit’s alignment with the target, and it was secure on tripod. All loads supersonic. The base of the boattail measures 0.212".
With Hornady 130 gr ELD's, it would not trigger suppressed. It would trigger and record unsuppressed with no errors. All loads supersonic. The base of the boattail measures 0.233”.
The unit has triggered and recorded suppressed .223, 300 AAC and 308 previously (supersonic). It will not trigger 300 AAC subsonic without air-rifle mic.
Any ideas why would it not trigger and record any of the Sierra projectiles? Any ideas why would it trigger on the Hornady projectiles suppressed and not record data? BTW, LabRadar was absolutely no help today.