I have recently received my 22-243 winchester, not the middlestead version just a straight 22-243, built on a Mauser 98 action. I have 1 in 9 twist barrel and want to shoot the Hornady 75 grain A-max. I have found a little bit of loading information on the web and got a little loading info from the gunsmith that built the gun, however I would like to try some other powders. The little bit of info that I have found seems to be almost identical info for the same powders as a 243 with 100 grain bullets. My question is, since this is the parent cartridge, am I safe to start at the starting loads and work up with other powders that are shown foir a 243 with 100 grain bullets. I am new to wildcat reloading and I am not sure if the is a safe place to start. It seems to me that as long as I start low and work up this would be fine. Any help wouold be greatly appreciated. Thank you.