Ballistic Co effiecent

Trigger Dr · Post by **Trigger Dr** » Thu Mar 18, 2004 10:56 pm

Is there ANYONE out there that can provide me with the BC of the Lyman 457132?
Just received the mould, cast 272 bullets, threw 17 back in the pot, going shooting tomorrow. Need the BC to calculate my sight settings.
Trigger Dr jim Milner

TYRVR · Post by **TYRVR** » Fri Mar 19, 2004 8:00 am

DANG!
I don't ususally need the BCs until after I have shot.....then two of them washed down with a half pint of "Franklins Finest" tooth whitener, dulls the memory of the humiliation and sounds of laughter from my buddies to the point I can stand it.

Trigger Dr. the Co-eff. may not be published yet from Lyman as it is a new bullet, you may have to either run it through your program or use the Co.eff. from a like weight and design to get your rough settings.

powderburner · Post by **powderburner** » Fri Mar 19, 2004 9:27 am

tr,dr. the b.c. for the 457132 is .402 according to mlv in his book on buff rifles page 195. hope this helps

MLV · Post by **MLV** » Fri Mar 19, 2004 9:38 am

Just for information. That bc for 457132 is the "real thing". It was taken over a 200 yard range surveyed to 1/10 of an inch. This experiment was done with Dr. Oehler, the chronograph maker, on his personal range in Texas. Alloy was 1/20 tin to lead and bullet weight was 536 grains.

Trigger Dr · Post by **Trigger Dr** » Fri Mar 19, 2004 11:18 am

Thanks to all who replied.
Jim

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Ballistic Co effiecent

Ballistic Co effiecent

"Need the BC to calculate my sight settings"......