Yes, you can use your dillon 550 for the 270 wsm. I have reloaded over 100 rounds so far for mine. as far as the conversion kit, dillon does have one, I think there is one for all the WSMs (don't quote me on that though). I don't use the powder measure on mine when reloading rifle bullets. As far as dies, I personally like the hornaday dies, but of course you can use any standard die on the dillon.
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