I'm looking for some ideas on load development for a 7mmUM in a 700 Sendero with a factory stainless flutted barrel. I'm thinking of starting out with the 162 A-Max. I picked up some Retumbo. Has this powder turned out to be the optimum for this caliber? I know there were some delays in it's release last year. I am willing to compromise and sacrifice a little speed if it will mean a longer throat life, but I want to play at 1000 yards or slightly more. I won't use it much beyond prarie dogs or coyotes. Should it have a run at the lands? I've heard of problems seating too close to the lands and a short run. Any tips that may speed up my load development would be appreciated. Mike.