When I loaded my first batch the other night, I used Loadbooks USA, Inc. "The Complete Reloading Manual for the .243 Winchester" 2000 edition to get my data. I used the information for IMR powders since that was what I was using. According to the IMR data, using 80 gr bullets, the max load of IMR4350 is 48.0 gr compressed, so I started with 43.5 gr. I now see that according to most other data from bullet mfgs show a much lower max charge for the 80 gr and that I was approaching or even exceding the max for all but IMR data. What gives? I know that different brands of components will give slightly different results, but we're talking four to five grains difference here. Which data should I use to start from? If the IMR data was correct, then I was perfectly safe (reduced the max charge by 10% to start). If the others are correct, I'm lucky the damned thing didn't explode. I downloaded the IMR Handloader's Guide from their website, and it doesn't even list the .243 Win in their data. It included Weatherby data in a seperate part, but it doesn't show any data for 80 gr bullets. Am I exceding the max load or not?