I use 4 hole rings on my standard caliber rifles 223, 243, 7mm-08AI, 257 Bob, 308, 250 Savage.
Usually Vortex Vipers rings.
I use 6 hole for magnum calibers.
As a side note, after trying several different manufactures i finally settled on the Vortex rings as they were the only ones that didn't allow the scope to shift on my wifes Rossi R243.
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