You can get all of the brass you want. I get it in Remington, Norma and Hornady. My bolt action pistol shoots the Hornady the best for some reason.
Where are you finding the Remington brass?
If i didnt currently own two this would be on the way to PA!! 150SST and DOA every time.. I have not yet found a better combo for whitetails and i have tested up and down the spectrum.