ATP - Recommended Minimum Engagement Distances

	Minimum Engagement Distances in Feet		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	<360 / 295 fps	15	20
	1.2 - 1.5 J	< 400 / 325 fps	30	40
	1.5 - 1.9 J	<450 / 365 fps	45	60
	1.9 - 2.3 J	<500 / 410 fps	60	80
	2.3 - 3.4 J	<600 / 490 fps	80	120
	3.4 - 4.6 J	<700 / 575 fps	100	145

8 mm	Muzzle Energy / Class	Muzzle Velocity (listed as 0.34g / 0.45g max)**	0.34g		0.45g
	< 1.5 Joules	<310 / 270 fps	20		25
	1.5 - 2.3 J	<385 / 335 fps	35		50
	2.3 - 3.4 J	<460 / 400 fps	55		70
	3.4 - 4.6 J	<540 / 470 fps	65		85
	4.6 - 5.3 J	<580 / 505 fps	75		100

* 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 400 fps 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 570 fps 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 510 fps w/ 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 100 feet.

** 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 385 fps using 0.34g BB's, or 335 fps using 0.45g BB's. If a rifle chrono's at 530 fps with 0.34g, you would use the 3.4-4.6 J section (which allows a maximum fps for 0.34g of 540 fps) and would have an MED of 65 feet. If a rifle chrono's at 325 fps w/ 0.45g, they would use the 1.5-2.3 J section (and have an MED of 50 feet).

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