So, I'm using two different vld bullets in 6.5 C: the Sierra TMK and the Hornady ELD Match.
Sierra's data reports a G1 BC of .518 @ >2200 fps. Curiously it is .535 between 1625 and 2200 fps - when it gets way out there it gets better.
Hornady (10th Edition) reports a G1 BC of .549 at 800 yards via Doppler.
I conclude from that the profiles are slightly different and I assume so is the bearing surface.
I'm experimenting with 3 different powders: Varget, IMR 4350, and H4350.
For Varget at 2700 I get 37.3 grains in the TMK and the ELD; but at 2600 the TMK calls for 35.8 and the ELD for 36.4.
For IMR at 2700 the TMK calls for 42.0 and the ELD for 41.4; at 2600 the TMK wants 40.5 and the ELD 39.8.
For the H4350 the TMK calls for 41.3 at 2700 and the ELD 42.8 (max load); at 2600 the TMK wants 39.7 and the ELD 41.1.
I was curious that there was that much difference in loadings for the two bullets.
I will use the respective tables for bullet type since I've got them. I was wondering if any of you have experience with these bullet/powder combinations and what worked for you. I'm shooting this out of a 26-inch barrelled Savage Model 12. For the time being I'm restricted to a max range of 500 yards.
Sierra's data reports a G1 BC of .518 @ >2200 fps. Curiously it is .535 between 1625 and 2200 fps - when it gets way out there it gets better.
Hornady (10th Edition) reports a G1 BC of .549 at 800 yards via Doppler.
I conclude from that the profiles are slightly different and I assume so is the bearing surface.
I'm experimenting with 3 different powders: Varget, IMR 4350, and H4350.
For Varget at 2700 I get 37.3 grains in the TMK and the ELD; but at 2600 the TMK calls for 35.8 and the ELD for 36.4.
For IMR at 2700 the TMK calls for 42.0 and the ELD for 41.4; at 2600 the TMK wants 40.5 and the ELD 39.8.
For the H4350 the TMK calls for 41.3 at 2700 and the ELD 42.8 (max load); at 2600 the TMK wants 39.7 and the ELD 41.1.
I was curious that there was that much difference in loadings for the two bullets.
I will use the respective tables for bullet type since I've got them. I was wondering if any of you have experience with these bullet/powder combinations and what worked for you. I'm shooting this out of a 26-inch barrelled Savage Model 12. For the time being I'm restricted to a max range of 500 yards.