 <unk> @-@ loading guns seemed to offer important advantages . A breech @-@ <unk> could be <unk> without moving the gun , a lengthy process particularly if the gun then needed to be re @-@ aimed . The Warrior 's Armstrong guns also had the virtue of being lighter than an equivalent smoothbore and , because of their <unk> , more accurate . Nonetheless , the design was rejected because of problems which plagued breech @-@ <unk> for decades . 
