Some time ago I read an interesting thread on the AccurateReloading forum. A poster explained how he would place the filler under the powder (between powder & primer, instead of between powder & bullet) to avoid the risc of a pressure wave "ringing" the chamber. He claimed there was no problems with ignition and SD numbers were good - and no "leftovers" in the barrel afterwards. The poster came across as a person who knew what he was doing, and the more I think about it the more sense it makes to me. Has anybody in here tried this approach? I plan on giving it a try in my 45-70 and do a velocity test on two identical loads, except for the filler switcheroo.