Eyefor, the 7/08 can get away with faster powders than the 270, 270 has a bigger case and a smaller bore, ergo - slower powder.
If someone wants to shoe horn a slow powder into a small case, it is entirely up to them. However, what is the point in having good rifles, expensive optics etc, to compromise on a less than optimum powder? All you are going to do is buy two tubs of one powder, instead of one tub each of calibre specific powders.