Don is correct, at least on the speed thing. I'm not as picky about the temp but speed is just as important, maybe even more so. Have everything ready and close at hand that you might need, especially on the gang moulds. I've seen where new caster have problems getting started and quite often they are son concerned with getting the perfect bullets or RBs that they fidget around trying to get them perfect and their mould never gets up to proper temp to cast good.