(1) The brass is hard to resize and expand because it's factory new. Lube every 5th or 7th case. You may also trim/chamfer/deburr the new cases, if you have the equipment to do that.

(2) Throat jump doesn't matter a whole ton. Load to whatever length makes you happiest.

(3) Premature throat and topstrap erosion doesn't happen because one powder is "hotter" than another. It happens through the use of extremely slow-burning ball-type powders. Titegroup is not one of these.