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crouching down

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Lew Yard:
Taking a .50 BMG rifle supported by a bipod, in good condition, firing at a stationary target with good technique may result in precise and accurate fire.

Take the same rifle, damage the sighting equipment so it's badly off, and attempting to squeeze off a few shots may result in a reliable, tight grouping in the wrong place.  That's precision combined with inaccuracy.

Loading a sawed-off open-choked shotgun with birdshot and firing it at a target 100 yds away may result in highly accurate fire (if the shooter and target are both stationary and good technique is used) but the individual pellets will likely be spread over quite an area at that range.  That's imprecise.  The same would go for firing smoothbore muskets at range w/ 1800's-tech-level powder and ammo.

mor2:
so gamewise, can i say that accuracy is your chance to hit the target while precision is your chance to hit multiple times.
if so its means that sitting improves your chance to hit target using half/full auto but it doesnt matter if you going for a single shot  ???

Lew Yard:
Spread affects all shots, and crouching reduces the imprecision -- meaning that you'll probably deviate from the 'perfect' shot less.

Spread affects the how much each shot is likely to deviate -- in angular terms.  Take the error in angle terms, add the range to target, and that affects how far you've actually missed by (if the shot makes it without being stopped by an obstacle).  Missing the center of the target by a tiny distance might mean that you actually hit.  OTOH, at extremely long ranges or against targets mostly behind cover (*), even a small angular deviation may mean a bad miss.

Burst fire tends to have a higher spread, and therefore the expected deviation of each shot is higher -- but you can still be spot on, it's just less likely.  Aimed-shot fire modes have lower spreads than snap shots, but you pay with higher TU cost.  Per-shot damage is also per fire mode, so it's technically possible to e.g. model a hit from an aimed shot as more deadly on average (reflecting better placement, say).  The flamethrower is actually modeled as a weapon that fires many, many shots... individually low-damage shots, but so many that you're likely to do a fair bit of damage unless your target has armor that's suitably fire-resistant, even if you're not especially skilled.

IIRC, the code supports the possibility of a weapon's fire mode having a bias (a tendency to fire too high, say) -- that'd introduce systemic inaccuracy into that mode.  That could be used to simulate e.g. badly controlled muzzle climb -- not only might the spread by high but the (expected) center of the burst might be slightly above the target.

(*) Should be noted that cover can be penetrated, to a limited degree (limited number of walls and at reduced damage), by certain projectile weapons (IIRC, the coil gun has the best 'throughwall' factor of any weapon available in the campaign mode).

mor2:
yes but, modern weapons has very low spread, if you equip it on stationary platform and shoot 10 consecutive shots for 50-100 meters you are most likely to hit the same spot.
so when we speak about spread we mostly speak about recoil effects, static values like the weapons compensation mechanism and dynamic you and how you react.

thus for one aimed shot when you dont need to require the same spot to shoot again the effects of "weapon precision" should be minimal.
you can say that in other positions it easier to shoot multiple single shot but brust, its mostly how you compensate ( "accuracy" or weapon handling)

Duke:
Thanks Lew :)

I understand that accuracy expresses how well the weapon is handled, while precision expresses how well the weapon itself can perform, right ?

Is that difference in the meaning of the two words restricted to weapon use ?

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