I wanted to know why they don't make a load bigger than a 150 Gr for the 270, or if they ever will come out with a 165 or 180.
Because there is no reason in the world to have a bullet heavier than 150 grains in the .270 Winchester even though they are available for the reloader. Same reason they don't make a 130 grain load for the 243 Winchester. The drop in performance would doom it to sitting on dealers shelves for eternity.
A bullet weighing more than 150 grains reduces the velocity to an extent that it completely defeats the purpose of owning the flat shooting .270 cartridge in the first place. With a 160 grain bullet you would be looking at about 2600 - 2700 fps and with a 180 grain bullet you would be looking at 2400 - 2500 fps.
The BC and SD of a 150 grain .277" bullet isequal to (give or takedepending on the exact bullet) an identicle bullet weighing 180 grains in a 30 caliber and would be perfectly suitable for hunting even the largest moose.
Basically, if you need a bullet weighing more than 150 grains then get a cartridge that fires a larger diameter bullet...... IE: 30 calibersuch asthe 30-06.