In this country we are all entitled to an opinion and the right to express it. Mr. Curious, your quest for a "Big Bore" and the need for that big bore was quite nicely answered with the suggestions of a 308 or 7-08.
I have made a quest out of trying to determine what caliber will work best in the 14 to 15 inch barrels.
Once you pass the 308 and 7mm-08 in a 15" barrel, there is no appreciable gain in velocity or effectiveness. All a 30-06 will do in a 15" barrel is reduce the actual barrel useable area by taking up more space for the chamber. A 7mm Mag will do the same thing.
I have a 308, as I mentioned before, and I also, have a 7mm BR 15". If you like to shoot a lot, you might consider recoil. I recently read an article about the testing of a Winchester Lever gun in the 405 Winchester cartridge. The plan for the rifle was to hunt in Africa for huge critters. someone asked if the recoil was tolerable. The writer declared that if your were up against a nasty rhino, simply hand the gun to the rhino and ask him to shoot at you. If the Rhino missed, the recoil would kill the rhino.
Now, with all that said, if you have Microsoft Excel Spreadsheet software, I have a spreadsheet with a huge amount of data comparing the effective ranges of most of the calibers in this discussion.
Send me an email and I will send the file as an attachment. You will be astonished at the various results.
Harold Clark haroldclark@citlink.net