For deer; 139gr Hornady fb or BtSpt; Sierrra 140gr FB or SpBt, Speer 130 or 145 BtSpt.
With the 130gr Speer, try 43.0gr of IMR4064, with the 140-150gr bullets RL17 or H4350.
A "sleeper" load for my Remington Mod-7 is 44.0gr of BL-C2. It's "hot", but very accurate and near 2,900fps. Only powder/load faster than IMR4350 I've gotten decent results with. YMMV.
re: 6.5x55; I agree, however my 7mm08 leaves a bigger/wider blood trail which is as short or shorter than the .260. Either kill as quick as my .30/'06,.338/06 or .300RUM on deer, with less of "my blood" shed.... Every deer I've shot with my .300RUM drew my blood as well as deer's.... (Weatherby "eye")....