Of course a 270 will work.
Been mostly packing a 270W and 150 grainers for almost 40 years. Out of 40 some elk with rilfe and bow, 25+ have been with the 270 and 150gr bullets. Most with Partitions, some with Sierras and others.
A premium bullet really helps the 270............
Lot's of bullets will generally work, but picking the right elk bullet is probably more important than picking an elk cartridge.
Casey