Both the 25-06's and the 280's are good choices...I use my 25-06's for conversions...not that they aren't any good...but to get what I really want( a 26" 338-06...and a 26" 270)...My choice for 1 additional barrel...would depend on it's usage...varmints up to 600lbs ...go with the 25-06...deer up...go with the 280...if your wanting to rebore to something else in standard calibers...go with the 25-06...rebore to some of the improved calibers...go with the 280...
Mac