update:
I put the 1-4 leupold scope on the shotgun...
I figure its the best I got so I went with it..
And as I have been trying slugs in the shotgun... The recoil pain in swapping scopes is less on the 3030 than having to do it on the 12 ga twice.
Your new best friend:
http://ads.midwayusa.com/product/726246/caldwell-lead-sled-plus-rifle-shooting-rest?cm_mmc=pf_ci_google-_-Shooting+-+Rests%2C+Bi-Pods+%26+Benches-_-Caldwell-_-726246&gclid=Cj0KEQjwjem-BRC_isGJlJ-0h-MBEiQAbCimWEPmc4PBtOs0zRNfloAY1J1HMJQni9PfmWn8xbmo3PYaAtyL8P8HAQ