A bearing system for a projectile having a longitudinally extending body portion (14;14') with a forward portion and a rearward portion and a spindle (18;18') generally defining a central axis (CA;CA'), the projectile being subject to pre-launch, launch, set-back, set-forward, balloting, and in-flight forces, the bearing system comprising: a first bearing configuration having a first member; a second bearing configuration having a second member; said first bearing configuration and said second bearing configuration being configured to permit selective relative rotation between said body portion (14;14') and said spindle (18;18') about said central axis (CA;CA'); said first member defining a first bearing surface; a first engagement portion fixed relative to said body portion defining a first engagement surface; said second member defining a second bearing surface; a second engagement portion fixed relative to said body portion defining a second engagement surface; said first bearing surface being configured to engage said first engagement surface upon the projectile experiencing set-back forces; said first bearing surface being configured to be substantially disengaged from said first engagement surface upon said projectile experiencing set-forward forces; said second bearing surface being configured to be substantially disengaged from said second engagement surface upon said projectile experiencing set-back forces; and said second bearing surface being configured to engage said second engagement surface upon the projectile experiencing set-forward forces; characterised in that: said first bearing surface extends at an acute first angle with respect to said central axis; said first engagement surface extends at an angle substantially parallel to said first angle of said first bearing surface; said second bearing surface extends at an obtuse second angle with respect to said central axis; said second engagement surface extends at an angle substantially parallel to said second angle of said second bearing surface; and by further comprising: said first bearing configuration having a first cooperating member that is axially displaceable with respect to said first member; and a first biasing element that generally axially biases said first cooperating member towards said first member. a first bearing configuration having a first member; a second bearing configuration having a second member; said first bearing configuration and said second bearing configuration being configured to permit selective relative rotation between said body portion (14;14') and said spindle (18;18') about said central axis (CA;CA'); said first member defining a first bearing surface; a first engagement portion fixed relative to said body portion defining a first engagement surface; said second member defining a second bearing surface; a second engagement portion fixed relative to said body portion defining a second engagement surface; said first bearing surface being configured to engage said first engagement surface upon the projectile experiencing set-back forces; said first bearing surface being configured to be substantially disengaged from said first engagement surface upon said projectile experiencing set-forward forces; said second bearing surface being configured to be substantially disengaged from said second engagement surface upon said projectile experiencing set-back forces; and said second bearing surface being configured to engage said second engagement surface upon the projectile experiencing set-forward forces; characterised in that: said first bearing surface extends at an acute first angle with respect to said central axis; said first engagement surface extends at an angle substantially parallel to said first angle of said first bearing surface; said second bearing surface extends at an obtuse second angle with respect to said central axis; said second engagement surface extends at an angle substantially parallel to said second angle of said second bearing surface; and by further comprising: said first bearing configuration having a first cooperating member that is axially displaceable with respect to said first member; and a first biasing element that generally axially biases said first cooperating member towards said first member. said first bearing surface extends at an acute first angle with respect to said central axis; said first engagement surface extends at an angle substantially parallel to said first angle of said first bearing surface; said second bearing surface extends at an obtuse second angle with respect to said central axis; said second engagement surface extends at an angle substantially parallel to said second angle of said second bearing surface; and by further comprising: said first bearing configuration having a first cooperating member that is axially displaceable with respect to said first member; and a first biasing element that generally axially biases said first cooperating member towards said first member. said first bearing configuration having a first cooperating member that is axially displaceable with respect to said first member; and a first biasing element that generally axially biases said first cooperating member towards said first member.