Do you reload? if you don't that will dictate what calibers you can convert to, here are a few that ammo is relatively available.
204 Ruger
223
22-250
220 swift
6BR
243
25-06
257WBY
260 Rem
264 WinMag
6.5 X 284
270 win
270WSM
270WBY
7-08
280
7mm RUM
308
30-06
300 WinMag
300 WBY
300 RUM
338 WinMag
338 RUM
Dean
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