for .223 using 50gr Hornady V-Max bullets and Accurate 2200 Data Powder. I'm thinking about 21-22 grains? I'm going jackrabbit shootin' tomorrow and need to make some up before the afternoon when we leave. Gun is a 26" Thompson/Center Encore. Thanks.

I'm just getting into loading for the 223, so I'm not any help. You can check out this site and see if someting works for you. Most of my rifles shoot best with loads below max.
http://www.reloadersnest.com/frontpage.asp?CaliberID=18
Don

I don't have all my data handy but a AA Data 2200 jug says 23.5 gr as max for a 55 gr fmj bullet

Johnch

So would I use less powder or more powder for a lighter bullet?

I would try a start load of 22.0 grains

Here is data I have these are max loads
Here's the data on the .223 From the Data Powder 2200 Supplement:
Bullet Max Charge Velocity Pressure OAL
Nos 40 BT 25.0 gr. 3831 fps 50,500cup 2.260"
Nos 45 BT 24.8 gr. 3795 fps 50,000cup 2.260"
Nos 50 BT 24.0 gr. 3540 fps 49,600cup 2.230"
IMI 55 FMJ 23.5 gr. 3265 fps 48,000cup 2.230"

Johnch