Re: ballistic coefficients?
Cdixon
The BC of the 168 Sierra MK is .636
Even if you ran the 168 gr Much slower (say 3000 to 3100 fps) then the 140 gr, the 168 would most certainly shoot flatter at "longrange".
If you really want to reach out with the 7mm, try the 180 gr creations.
I can run the drops if you wish.
The 140 gr has a .488 BC which really is not that good for a 7mm bullet.
I like to start with a bullet that has at least a .555 BC and above in any of the Longrange rifles I use.
Then again, the range one shoots makes a difference too.
If your shooting out to 500 or 600 yards it really may not make a big difference to you. After that yardage it's the higher BC and normally heavier bullets that will win out even if it is going slower to start with.
Later
DC
As an add onHere are the numbers concerning the two bullets.
140gr Going at 3250 FPS Starting velocity has remaining Velocity of 2037 FPS and 1290 Foot Pounds of energy left at 700 yards.
The 168 gr going at 3050 FPS out the barrel has remaining velocity of 2129 Feet per second and "1691 foot pounds" of energy left at 700 yards.
At 700 yards the velocity is faster and the energy level is higher with the 168 gr.
[ 07162003: Message edited by: Darryl Cassel ]
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Darryl Cassel
