Hello I have a Remington 700 adl I have a vortex diamondback scope on the gun and I am having major issues sighting this gun in. I free floated the barrel on the gun and have tried different ammo but am now using rem core lokt 150 gr. Which I have had success w in the past. I'm not sre what it might b but seems like wen it warms up the bullet goes way off my left to right stays on close but up and down moves about 4-6 inches sometimes up sometimes down and this us at 100 yds its driving me crazy and ammo is not the cheapest thing ever. I was shooting the gun in a vice don't no if tht may have messed something up or the free floating I did or wat? Any help would b amazing I have a deer tag to fill in a couple months and gotta be dead on where I hunt u expect to shoot at least 200-300 yds on average and Im not even confident at 100! I have also checked tht everything is tight as well. Thanks Bri