Bulk/loose ammo is fine for plinking/general shooting if your rifle likes it, which goes for any ammo. Bulk/loose ammo is generally cheaper; QC not as good though, therefore more misfires and degraded accuracy. CCI, Fed, Remi, Win are all bottom of the RF ammo ladder. CCI is probably the best of the bunch.

End of day the type of shooting you do and the accuracy you require will dictate the rifle and ammo requirements.

I shoot benchrest, consistent high accuracy requires so ammo has to be Eley, Lapua, RWS and some SK. 

For RF availability, check the link.

You get what you pay for. If you want one hole results at 50m (OK a big 12mm hole) then bulk ammo is not the ammo to use.

Very true.

I cannot understand why SK magazine (loose/bulk) is so dear compared to other SK RF ammo.