I finally got around to testing the effect of different depth nosering cuts with Tubbs' tool. I tested no cut, .020" and .030" using an Oehler 89 with an impact target at 500 yards. I was using my 22" barreled 6.5 Creedmoor with Berger 153.5's.
I had some difficulty reading a few shots with the wind blowing my optical sensors around a bit but I was able to read 6 shots of the 'normal' bullet and 10 each of the .020" and .030" cuts. The actual SD improved with the cuts.
I went to the range with 60 loaded rounds. I brought a drill and cut the rings at the range. Load was 41.1 grains R23.
no cut - .345, BC variation - 1.4%
.020" cut - .3512, BC variation - .6%
.030" cut - .3502, BC variation - 1.9%
Oehler output attached.
I had some difficulty reading a few shots with the wind blowing my optical sensors around a bit but I was able to read 6 shots of the 'normal' bullet and 10 each of the .020" and .030" cuts. The actual SD improved with the cuts.
I went to the range with 60 loaded rounds. I brought a drill and cut the rings at the range. Load was 41.1 grains R23.
no cut - .345, BC variation - 1.4%
.020" cut - .3512, BC variation - .6%
.030" cut - .3502, BC variation - 1.9%
Oehler output attached.
Last edited:
