I've used pretty much all types of brass. But have not bought spendy brass until lately when I couldn't find run of the mill brass. Back when I had more time than money I used to measure neck thickness and turned necks to uniform thickness, marking brass that had necks that were thick on one side and thin on the other figuring the whole case would be like that.
My 35 Whelen had a tight chamber cut by a very good smith. I messed around with different 30-06 brass necked up. Finally I bought some Nosler brass and it was way better in that 35. I'm not sure if it makes as much difference in factory chambers that are not so cut.
