I've been tinkering with the GRT. I probably know just enough about it to be dangerous. I was doing some research with 180 grain bullets out of a .30-06. I got to ask the question. According to this tool, is there any powder remotely close to IMR 4350 that is adequate for 180 grain .30-06 loadings? The IMR 4350 seems to be nearly perfect when looking at case fill ratio's and a complete burn before leaving the barrel. I always knew that IMR 4350 was an excellent powder for the .30-06 but, WOW! Seems to be a match made in heaven.