1st-for Christmas my inlaws got me a box of 38 special +p. I can shoot those in my 357 mag right?

2nd-I know it is definitely the wrong time but I would like to do a lot more shooting than I do now. I've got a 9mm pistol and .223 bolt rifle I would like to shoot more. What is a good NON-PANIC buying price for these rounds. I would like a few thousand rounds of 9mm and a few hundred rounds of .223
"The only purpose for a pistol is as a means to fight your way back to the rifle you should have never laid down."

Vegetables are NOT food, vegetables are what FOOD eats.