Guys, I recently acquired a Winchester saddle ring carbine in 30-30. Much to my dismay, finding brass has been next to impossible. I do have a considerable quantity of 7x30 brass on hand, and was considering necking a couple hundred pieces back up to 30-30. I know it will work, I already did it with one piece of brass. My concern is weakening the brass by overworking it. I will be using only cast boolits in this rifle, with mild to moderate loads. I should be fine right?