Calculating difference in BDC between 62 and 55gr

General Firearms Reloading & Ammunition
1

Good afternoon!

I recently purchased a GRSC illuminated riflescope.

It has a built in bullet drop compensator for 62 grain ammunition out to (I believe, haven’t got it in the mail yet) 500 yards…

I primarily have stocked 55 grain XM193 (a couple K of XM855, but not primarily)…

How would I calculate the difference between the two loadings so that I can use the BDC?

Also, are there any (preferabbly free) software programs for this sort of thing?

Thanks!

Nic

2

If you have one, for your Apple iWhateverthehellyouhave: http://ballistic.zdziarski.com/

Free online tool: http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

3

Thank you, Jim.

Still open to other replies as well for additional information.

Thanks,

Nic

4

bump for further responses?

5

JSantoro hit the nail on the head for you:D