I still shoot aluminums from one of my bows and it just happens to be 48@28,, its a St Charles Thunderbird 3 with a b50 string and the arrows are 1916, cut to 28.5 and 200gr points,,,,,,,, I came to the 200's after a lot of bare shafting and I think because they are skinnier and came closer in to the riser they wanted a heavier point so keep that in mind.
for a heavier shaft I can also shoot 2016's w/ 125's and if I wanted a lighter faster arrow I shot 2114's with 125's with this same bow.