My last unassigned action is my first buy that I still have not done anything with. I bought it as a 110 7mm RUM, and have since sold the barrel and stock. My plan all along was for this action to be my ultimate f class gun, and I have been doing a lot of reading and listening on here and at ranges to see what would be the best caliber. I still dont know which caliber to build, but have it down to 3- 7 WSSM, 7mm SAUM, or a straight .284. Is there any reason that any of these 3 calibers would not work on this action? I dont totally understand the length dynamics yet, but the 2 mag calibers are shorter than the original RUM, whereas the .284 would require a boltface change.