In particular, I would like to know the ballistic coefficient of a Remington 30 caliber (.308" dia.) 150 grain core-lokt (sp?) pointed soft point bullet.

Thanks,

H. C.

Around 0.193 to 0.314 depending on velocity.

I FINALLY got the number 0f 0.314 from Remington for use at 30-06 velocities.
It took me 5 letters before I final cajoled them into giving up the information!

Steve, Louis,

Thanks.

Is the 0.193 figure the subsonic BC?

H. C.

Henry, I would assume the .193 number is in the transonic range, the regime of highest drag. Mach .7 - 1.3 +/-

quote:

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Originally posted by HenryC470:
In particular, I would like to know the ballistic coefficient of a Remington 30 caliber (.308" dia.) 150 grain core-lokt (sp?) pointed soft point bullet.

H. C.

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You can estimate the BC of federal, winchester, and remington by compareing the charts in their free ammo ballistics tables with a chart in the speer and/or hornady reloading manuals.

OR: for rifle bullets, look at the energy levels of a load using the bullet of interest. Estimate the range that gives 1/2 the muzzle energy. The distance in yards will be the same as the BC (add the decimal point). This only works when the velocitys stay above the speed of sound.

In the case of the 'pointed soft point core lock' (in .308), muzzle energy is 2648 with 300 yard energy being 1344 (& 400 yard energy is 1048). 1/2 of 2648 (1324) will happen just more than 300 yards (BC is just more than .300)

To refine you can interpolate by taking 1344 minus 1048 (296) and 1344 minus 1324 (20). 20 divided by 296 gives .07, hence a more accurate BC of .307.

If I recall, I seldom see measured BC's closer than 10% of advertised values so don't get to excited about extremely accurate values.


JerryO

Jerry, thanks for that information. I have never seen it before. Your formula is certainly interesting! I will keep it for future use. (I note Sierra pretty much stopped publishing their bullets' B.C.s because the figures vary so much depending on velocity.)

.314 as listed in thier '05 catalog ballistics charts.