Probably,because they are actors first and recent archers,with a bit of Training.Maybe their coach saw fit to start em light,to develope good form,so they would look like they knew what they were doing and could actually hit somethin with it.LOLI doubt they wanted to wait the time it took to build up to the weight that those early archers used.Im probly the worst at nitpickin a film to death at inacuracies,but Cmon guys,lets be practical.LOLIm not usually up in arms about any movie,especially when it deals with history of which im familiar.Im usually very dissapointed but,i saw an interview on Tv with Crow,promoteing the movie,and was impressed with his genuine enthusiasm toward the history and craftmanship,pertaining to early archery.I mean the Guy was Genuinely exicited about it and forced the cameraman to do a closeup of the bow as he described the difference between the sapwood and heartwood and the why of it all.I can tell the Guy may be hooked.