Re: 7mm STW and Berger
If it has a 10T or better it will stabilize just fine. If you want to try H1000, and Retumbo, take a look in the manuals or go to the Hodgdon website. They have starting loads of 70.0 and 72.0 grains respectively with 175 grain bullets. I'd say drop one grain for starters. Just reference the powder website with whatever powder you think you will try. I'd also look at Ramshot Magnum, US869, IMR7828.