No.
Next question.
Don't change the 300 to a 7 because simple math will tell you that 300 is way more than seven, so it must be better. As for the .270 to .280, go for it. .280 is ten more than .270, so it's ten better. 20 better than a .260, and 30 better than a .250. Actually, the .280 is only 20 less than .300 so you might as well take it all the way. What's a measly 20 more...
"...find a trade..." Be easier to just sell it and go buy a new rifle.

In order for a .270 to become a .280, you must rebarrel not simply rechamber; .277" vs .284" but you know that. What do you hope to accomplish with the switch? The .270 and .280 are so close in performance that there is no practical difference that could be distinguished in the field, and maybe not on the range either. Ditto with a switching a .300 WSM to a 7mm. Performance overlaps in both cases, and all of these cartridges are excellent choices for chambering in a general purpose big game rifle.
I agree.....if your going to spend the money to rechamber a rifle, make it somthing sweet. Otherwise just go buy one and sell your current.x2 Boomer has hit the nail on the head.
One other suggestion you may consider if you want a slightly more hairy chested 270. A simple re-chambering to a wildcat known as the 270 Gibbs. You will have to fire form your cases and reload your own ammo but it would be cheaper than a re-barrel as Boomer has described.
I am sure you can google lots of information on the family of Gibbs chamberings, all based on the 30-06 case. They range from 240 to 338. I happen to have an old Husqvarna FN Mauser that I re-barrelled to 340Gibbs. Great moose gun. It is not quite a 338 Win Mag but with bullets up to 225 grains, it ain't far off. It has a bit of an edge over the 338-06.




























