ATP - Recommended Minimum Engagement Distances

	Minimum Engagement Distances in Meters		Mass of Projectile Used in Match / Event
	Muzzle Energy / Class	Muzzle Velocity (relative to 0.20g / 0.30g BB's)*	0.12g - 0.30g	0.31g - 0.43g
6 mm	< 1.2 Joules	<110 / 90 m/s	5	6
	1.2 - 1.5 J	<122 / 100 m/s	9	12
	1.5 - 1.9 J	<137 / 112 m/s	14	19
	1.9 - 2.3 J	<152 / 124 m/s	19	25
	2.3 - 3.4 J	<183 / 149 m/s	25	35
	3.4 - 4.6 J	<213 / 174 m/s	31	45

8 mm	Muzzle Energy / Class	Muzzle Velocity (listed as 0.34g / 0.45g max)**	0.34g		0.45g
	< 1.5 Joules	< 95 / 82 m/s	6		8
	1.5 - 2.3 J	<117 / 102 m/s	11		15
	2.3 - 3.4 J	<140 / 122 m/s	17		22
	3.4 - 4.6 J	<165 / 143 m/s	20		26
	4.6 - 5.3 J	<177 / 154 m/s	23		31

* Because high-powered rifles -- particularly gas rifles -- are able to transfer more energy to heavier BB's, we require that all rifles/pistol that chrono at more than 120 m/s with 0.20g BB's be re-chrono'd using 0.30g BB's. The reason for this is covered in detail in Section VI-A: Determining Muzzle Energy. For instance, if a rifle chrono's at 175 m/s with 0.20g BB's, we re-chrono the rifle to determine its muzzle energy using 0.30g BB's. If the same rifle chrono's at 156 m/s with 0.30g BB's (for example), we would use the 3.4-4.6 J section to determine the shooter's MED (and NOT the 2.3-3.4 J section). If this player uses 0.30g BB's for that rifle, they would be given an MED of 31 meters.

** Velocity listings for 8mm BB's are listed as the maximum for 0.34g and 0.45g BB's, respectively. Example: A rifle shooting at 2.3 J will chrono at 117 m/s using 0.34g BB's, or 102 m/s using 0.45g BB's. If a rifle chrono's at 162 m/s with 0.34g, you would use the 3.4-4.6 J section (which allows a maximum for 0.34g of 165 m/s) and would have an MED of 23 meters. If a rifle chrono's at 99 m/s with 0.45g, they would use the 1.5-2.3 J section (and have an MED of 15 meters).

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