i dont load hot at all. i am a firm believer in mid range loads. look up the 10mm in a reloading manual, then look at the bottom load for a given bullet and powder, then look at the maximum load for the same combination. i usually split the difference then tweek it as needed to ensure clean powder burn and accurate ammuntion.
brass is winchester and starline. as far as how many loadings...i cant honestly say. we inspect brass as it is loaded and we also load in bulk. it might take a few years for the same piece of brass to be fired more than once. i have never marathon fired brass to see how many loadings i could get out of one piece. if it looks iffy when i go to load it, i throw it out.