Re: new to reloading (Sorta) 7mm mag suggestions
All I can suggest is be meticulous about safe reloads and load in a quiet spot without interference or kids about. So no mistakes are made.
Don't overlook Hogdon powders as they are mainly made in Australia by ADI and are fairly heat tolerant from a chamber pressure point of view.
If you get hard to chamber cases after a few shots you may need a special collet sizing die made by Larry Willis. Some do , some don't.
Watch for pressure signs and stay with safe pressures that allows the ammo to function well and give some reasonable case life .