What seems to be the best powders for this cartiage? I'm not real "up" on all the techno stuff about powder...what is fast...or slow... I have read here that the 7 RUM is touchy about pressure...is there a powder that smooths out issue? keep in mind...I'd like to have a 700 yard deer size lazer...might be hard to do with it being so sensitive with pressure. I really would like to shoot 140's, but you guys have about convinced me that I need something bigger...so I was also thinking about using 160 Accu-bonds. FYI-the gun has a 1:9.5 twist. OMT-wouldn't a moly coated bullet help with pressure issues of this cartiage????? Or would it hide possible problems???? I've never heard of retumbo before registering for this site, but I see it as a possiblity. Who makes it? Thanks in advance!