Remington does manufacture 270wsm ammo, I think its 130gr scirroco's. Hard to find. Federal is realy extending there shortmag loads this year for all the wsm's. A 270 winchester will not fit into a 270wsm chamber so dont worry about that. Just make sure the box says wsm on it. On a side nite Remington even chambers a rifle in 270wsm[&:] Congrats on the new gun.