Hi new to reloading here and have a few questions. I shoot a 7mm Sendero SF II Remington Magnum which I am trying to learn to load for. Right now I have once fired brass from the rifle in question. I am trying to figure out what COAL I can load and not be jammed into the lands, it seems strange to me however I have the COAL with a dummy round down to 3.210 and it still seems to be getting into the lands how short should I expect it to get? This is the COAL from tip to tip not OGIVE. Just FYI it is Remington brass, and Speer 160 GR BT that I am experimenting with. Also what would be a good place to start loading with H1000 powder for the same bullet. I cant seem to find any info with the H1000 powder for the Speer 160 GR BT. Sorry hopefully it all makes sense and thank you in advance for any help.