Thread: Cast bullet BCs

Okay
Some one point me in the direction of a decent source of BCs for cast bullets.

.375 248 grain Lyman would be a start ?
.375 300 grain CBE

Once i have that sorted I can start on the .45 and .50s

Lee publish bc and SD data for their moulds, I can't imagine other manufactusers wouldn't.

Lee are great

But Lyman don't seem to and all my googling has found guys complaining about that !
I thought I could use a similar Lee one and crunch the numbers ... but lee only do one 375 and its nothing like mine

Well I will just have a stab and ground truth it with the reticle hold over to maybe 150m which is about where I will draw the line for the 375 Winchester

Originally Posted by akaroa1

Okay
Some one point me in the direction of a decent source of BCs for cast bullets.

.375 248 grain Lyman would be a start ?
.375 300 grain CBE

Once i have that sorted I can start on the .45 and .50s

The BC for the Lyman 375248 249gr cast bullet is .290 according to the Lyman 50th Edition reloading manual.

Originally Posted by Tech

The BC for the Lyman 375248 249gr cast bullet is .290 according to the Lyman 50th Edition reloading manual.

Cheers @Tech I thought it would be out there somewhere
But this time not on line

Originally Posted by akaroa1

Cheers @Tech I thought it would be out there somewhere
But this time not on line

Well, this time, as in from now time, it IS online...

The bc’s are not very accurate
I know my dope out to 800y with my 45/70 with the 500gn lee with 61gn by waight of 2f swiss Black powder in moa just from trial and error once you know the sight settings for 2 known distances you can then easily calculate where you should be at any said distance i can normally hit 1st or 2nd shot just from a simple calculation used by the old timers

I also know my Velocities and everything needed to do a modern drop chat me and several of the other guys tried it and its not even in the ball park for our bpcr rifles.... yet we use the same chats to shoot our modern rifles to that and farther with very little trial and error

I believe that ballistic calculators and bc values for that matter require a different set of calculations and values for subsonic projectiles. Anyhow shooting a verified drop chart is much more informative And enjoyable.