I'm in the process of building a custom rifle. I have been gathering parts for this custom gun for a long time. and have been planning on building a 7 STW now here's my problem I cannot find any brass or dies. now I am debating on building a 7mm Remington Magnum but I already have one of these its a original sendero.so here's my question would you chamber in a 7 stw and hope that you can find brass and dies for it. Or chamber it in a 7 rem Magnum and shoot it and wait for and hope for 7 STW dies and brass to come available. and then have it re chambered to the stw .what do you guys think give me some ideas