I have an RCBS "Junior", which is the previous version of the Partner. I have loaded .375H&H Mag on this press, without too much trouble. I dont THINK the Partner has quite as much mechanical advantage (leverage) as the RockChucker, but I wouldn't let that stop me. All the calibers you mention use 7/8" (thread diameter)dies. Unless you're going to load .50BMG or 20mm, I think the Partner would do fine. Enjoy your new hobby
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