Frank;
I do not have the capability to calculate BC for the bullets I shoot.
I do know for a fact that the reason large caliber bullets shoot better, that is with less drift than a smallbore bullet with the same sectional density, is because surface area increases less for the given SD the bigger you go. As I indicated before in this thread; less surface area = less drag = less wind drift.
Then, "scientifically" or not I have fired in the same condition with fellows on the line at long range. Me with my 30'06, they with their 45s. After a relay in moderate wind is complete we have compared sight settings, finding that my windage is always nearly twice what they have dialed in at any range beyond, say, 650 yards.
If you can calculate the BC for RCBS 30-180-SP @ 190 grains and compare it to a good Postell design 45 @ 535 grains it would be interesting.
Further, I do not say that smallbore bullets are "less accurate" than the big stuff: In calm or nearly calm conditions the 30 will shoot as well or better than the 45s ~ accuracy, less recoil, all that stuff. I do maintain that they drift more in the same wind.
However, we have been flirting around with speed in this thread a good deal. At the relatively close targets, like from the 350 "Offhand" on out to the 587 "Diamond" - where the 30 is still humming along supersonic - things go very well indeed. Its fun!
Frank asks; One other thing....... have you actually tried shooting a 30 cal at that range at lower velocity?
Forrest; Yes. At the beginning when I first took the 30'06 out for long range I was using the typical light loads of 4759. These combinations were accurate but slow. Not really slow liken to PB shooting but not 'fast' either. They drifted badly enough that in any real wind I'd run out of windage trying to keep up.
Good morning,
Forrest