All the values and ranges I'm using are all calculated relative to the BIS Short Range missile class:

Here is the logic.

Most of BIS' values for SRAAM aren't much different than the ammo_Missile_ShortRangeAABase class values. So lets assume:

Assumption #1 - With a bit of research you can find that the 'average' range of the real world short range air-to-air missiles (SRAAM) comes to something like 16km.

Assumption #2 - In the armaverse 5000m (5Km) is equivalent to 14000m (14km). The 5000m comes from the max range BIS specified.

Now comes the maths:

(Real World MAX Range) / (Assumed Average Range) = “RangeRatio”

For example the Aim-9M max range is given as ~20km. So:

(20km) / (16km) = 1.25

Now we have the “RangeRatio” we can multiply that by BIS's 5km max range value to give us the 'Adjusted/scaled range' for our new missile.

(BIS MaxRange) * (RangeRatio) = “NewScaledRange”

(5km) / (1.25) = 6.25 (Km) = 6250m

class ammo_Missile_ShortRangeAABase: MissileBase
{
	model = "\A3\weapons_f\empty";
	proxyShape = "\A3\weapons_f\empty";
	hit = 130;
	indirectHit = 85;
	indirectHitRange = 10;
	warheadName = "HE";
	proximityExplosionDistance = 20;
	fuseDistance = 100;
	maneuvrability = 42;
	airFriction = 0.14;
	sideAirFriction = 0.23;
	trackOversteer = 1.6;
	trackLead = 0.9;
	initTime = 0;
	timeToLive = 20;
	thrustTime = 5;
	thrust = 250;
	maxSpeed = 700;
	simulationStep = 0.002;
	airLock = 2;
	lockType = 0;
	cmimmunity = 0.92;
	weaponLockSystem = "2 + 16";
	missileLockCone = 180;
	missileKeepLockedCone = 180;
	missileLockMaxDistance = 5000; <<< -----------------Max Lock range
	missileLockMinDistance = 250;  <<< -----------------Min Lock range
	missileLockMaxSpeed = 600;
	class Components: Components
	{
		class SensorsManagerComponent
		{
			class Components
			{
				class IRSensorComponent: SensorTemplateIR
				{
					class AirTarget
					{
						minRange = 500;      <<< -----------------Min Lock range
						maxRange = 5000;     <<< -----------------Max Lock range
						objectDistanceLimitCoef = -1;
						viewDistanceLimitCoef = 1;
					};
					class GroundTarget
					{
						minRange = 500;
						maxRange = 4000;
						objectDistanceLimitCoef = 1;
						viewDistanceLimitCoef = 1;
					};
					angleRangeHorizontal = 180;
					angleRangeVertical = 180;
					maxTrackableSpeed = 600;
					minTrackableATL = 3;
				};
			};
		};
	};
	cost = 1000;
	whistleDist = 20;
	aiAmmoUsageFlags = 256;
	missileFireAnim = "rocket_fire_hide";
	CraterEffects = "AAMissileCrater";
	explosionEffects = "AAMissileExplosion";
	effectsMissile = "FX_Missile_AA";
	muzzleEffect = "B01_fnc_effectFiredJetMissile";
};