Re: Drag Function question.
Nathan,
For those distances/cartridges I would not expect different drag curves to produce significantly different results.
For instance, here are some results of one of my 6.5x284 loads, comparing
1. Using Sierra provided multiple G1 BC/velocity values
2. Using just top Sierra G1 BC value (0.595)
3. Using top Sierra G1 BC value converted to G5 BC with G5 drag curve
4. Using top Sierra G1 BC value converted to G7 BC with G7 drag curve
2775 fps Sierra 142gr MK, sight Height 1.8. ICAO standard conditions.
This is generated with some software I wrote, but you could easily compare with any of the other packages out there.
Drop (in) 600 yd 1000 yd
1. MultiG1 82.2 322.3
2. G1 81.4 314.7
3. G5 82.0 321.5
4. G7 81.5 316.2
I would suggest using the Sierra multiBC values where you have them with the G1 curve. If you have a vendor supplied or measured BC for another drag curve then use that. Converting a G1 BC to another drag curve is just another place to introduce some error, since most of the time you don't know the velocity range over which the G1 was calculated.
Jeff
