reloader #7 oddities

[oldchet]

Has anyone else noted that the universal drop table for the ballistic coefficients tables starting at .390-399 through .430-.499 actually get worse with .430 finally equal to .390? Checked against reloader #6 and that does not occur.

 

[HomerOz]

G'Day Oldchet,

Mate I can only assume you are referring to the Nosler Reloading Manual's #6 & #7 and a particular, unspecified bullet?
We would all love to keep this tread going but we need a bit more information from you there Oldchet!

Happy New Year
Homer

 

[JD338]

Chet,

As Homer mentioned, give us some more details so we can help sort through the differences.

JD338

 

[oldchet]

Sorry folksI assumed everyone used the ballistic chart in the back of the reloading manuals to get a general idea of trajectory, velocity, etc. I was looking up data for the 250-3000 using 100 grain bullets using the Nosler #7 reloading guide to see if there was anything new. The Partition has a B.C. of .377, the ballistic tip has a B.C. of .393 and the e-Tip has a B.C. of 4.09. When checking ballistic tables on the back of the book I noticed that the ballistics were better for the Partition were better than those of the E-Tip. Didn't make sense so I got curious and started checking when they started to line up again. Then I checked the reloading manual #6 and the E-Tip information was indeed better than the Partition. So I just started checking when the Ballistic tables in the #7 manual started to go back up again. As a matter of fact the ballistic info for the .390-399 at 2900 FPS in reloading #6 at 500 yards sighted in at 200 yards is V=1835, drop=-45.1 inches. Reloading manual #7 at 500 yards sighted in at 200 yards is V=1935, drop=-42.7. This is not a cartridge I would shoot long range, but somebody loading a .257 Weatherby at 3500 FPS would be off by more than 3" and that makes a difference.

 

[oldchet]

Wife called me for breakfast. I also checked online at G-7, Hornady, and Nikon. The ballistics posted there match with the information in the Reloading manual #6. But there is good news, I now have a reason to buy that chrono I have wanted for years. Plus you just have to shoot more to verify exactly what each load does. :wink: