Are Powerful Cartridges and Short Barrels a contradiction? When Building a Long Range Hunting Rifle must we always use Barrels in the 26"-30" length? I suppose what I am asking is are there any Long Range Cartridges suited to Barrel lengths of 20" or less? I note that Desert Tech offer a Rifle in .338 Lap Mag with an 18" Barrel!!!! Is this a realistic offering? Many thanks. Brit.