Is 26\" enough barrel for the 338 UltraMag? I have a chance to buy a Remington 700 BDL in 338 Ultramag. My concern is whether I can gain enough performance in the 26" tube to justify buying it and selling my 26" barreled 338 Win mag. Seems like alot more bang for not alot more performance. What is a good barrel length for this cartridge?