Does anyone make a reloading cartridge block for this round? I assume that the base of the cartridge is the same as the 416 Rigby? (cheaper to buy a loading block than spend $15 for a drill bit) How do you store your rounds after you load them? I was looking at 50rd cartridge boxes but these have the plastic hinge which seems like it won't last very long. I am using 300g SMK with a starting load of 78g of H1000 running fed 210 primers. I want to load up 20 more rounds gradually going up 1g at a time watching for pressure signs and chrono readings.