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The reason there are so many Ruger upgrades is because they're necessary.
I would look at an Ar 15 in 25 wssm, 300 ossm, 6.5 sporter/6.5 grendal, 6.8 spc, 458 socom, 30ar, 358 wssm, 338 wssm, 7mm wssm and Im sure there are more cals that would work. The great thing about the AR is there is a huge after market for it and we all know they are tried and true
r-25 is 243 7mm-08 or 308win great guns