Ballistic coeficient for Lyman mould designs

[AZ-Stew]

Anyone know where a person might find a list of ballistic coeficients for the various Lyman moulds shown on the Ol' Buffalo web site?

Thanks,

Stew

[dromia]

The Lyman Cast Boolit Handbook 3rd Edition has the ballistic co-efficient of some of its boolits at the end in the Cast Bullet Ballistics section.

I don't think this covers all the Lyman designs but is a good reference point, I would also use those for relative co-efficient purposes rather than absolute.

[jameslovesjammie]

The Lyman 49th has some coefficients as well. What mould and cartridge were you looking for?

+1 on coefficients being relative. Depends on speed of bullet. Many long range shooters will tell you that the published bc of many bullets are greatly off from actual calculations they have made for where their gun ACTUALLY shoots/drops at known distances.

[AZ-Stew]

Thanks, guys.

I'm just trying to get a ballpark figure so I can come up with a load for our local ranges' high-power shoot that goes out to 300 yds. If I can figure the trajectory based on the muzzle velocity and BC, I can get an idea of where to sight at 100 yds to stay mostly on target at 300 yds without a lot of cut-and-try testing at 300 yds.

I don't really intend to become a hard-core HP shooter, I just want access to the HP range at our club so I can do my experimenting in peace and quiet, away from the public part of the club range. If I shoot several matches with the HP shooters, I get unaccompanied access to the HP range at all times.

The boolit I use will be either the 311041 or the 311466 loaded to about 2000 fps for my Garand. I'd use J-words, but at $28-34/100 bullets, plus the powder, primers, match fees and gas to drive to the range, I can't afford to shoot many matches.

Regards,

Stew

[Bret4207]

I recall a BC chart for various nose forms and a formula to figure it in Handloader. I think it was a 2 part article and may have been authored by our own Ken Walters (KLW).

[klw]

I recall a BC chart for various nose forms and a formula to figure it in Handloader. I think it was a 2 part article and may have been authored by our own Ken Walters (KLW).

Not one of mine.

[jhalcott]

The BC of the 311466 (a fine bullet) is only.250 !If you sight it in at 100 yards the trajectory is 0@100, -11.23"@200 and -38.96"@300. Upping the speed to 2300 will cut the drop at 300 by about 10".
the 311041 (170 grain) has a BCof .220 It's trajectory is 0@100, -11.21"@200 and -38.7"@300. These are from the Lyman handbook #3. I wouldn't take them as gospel.
http://www.eskimo.com/~jbm/calculations/traj/traj.html This sight may help you figuring a guesstimae of what you want. Check results by actual firing to be certain they are at least close.

[John Boy]

Stew ... from Lyman's 48th Edition using Lyman #2:
311041 - min: XMP5744 - 1384 fps
Here's quick calculator for BC's ... http://www.handloads.com/calc/index.html

[Larry Gibson]

The actual measured BCs of both bullets at 2000 fps using an Oehler M43 are: 311041;.221, 31466; .256. That's pretty close to what Lyman says and what's been previously mentioned here.

Larry Gibson