## Minimum Vilooty Round

NOTE: UM/SIC CHAMCE IN VILOCITY COMSTITUTCS t MN4UTK CNAN6C IN CLIVATION

### Figure 130. Tempersuire effects.

<11 In the following tables curve A represents those factors (high temperature, low barometric pressure, and high relative humidity 1 which foster a high bullet velocity. The factors in curve B produce low bullet velocities« and curve C represents more average conditions. Greater extremes can. of course, be encountered resulting in correspondingly greater deviation.

(21 Chart 3 (fig 1511 defines the three curves in terms of their variables and shows the relationship of bullet velocity to range. Charts 4 And 5 I figs 152. 1531 show the time of bullet travel versus range and bullet drop versus the range respectively.

131 These tables are valid only for the 7.62-mm. MIJB match cartridge.

1)9. Zeroing and Lee of the Record Data Sheet

The way to zero a rifle is to shoot it in the position.

range, and cadence at which it is intended to be lined. Since obtaining a correct zero is so important, this exercise has been included. Depending upon the situation, a firer could be called upon to deliver a single, accurate shot at any range up to 900 meters. The firer must aero whenever he receives a different weapon, a new lot of ammunition, or when his rifle is disassembled for any reason. Prior to zeroing. 10 rounds should be fired to insure complete nettling of the receiver into the stock. A rifle must be zeroed by the individual who intends to use it. Characteristics such as spot weld, eye relief, position, and trigger control usually result in n different zero for different individuals with the same weapon. For the same reason, an individual's zero may «-hang* from one position to another when firing at the same range.

a. Zeroing with Iron Sight*.

(I» Meeaured distance. The most precise mrthod of zeroing a rifle is to place distinctive liming points at known distances. Place the targets between 100 and 900 meters in 100-meter increments. The firer then fires one or more three-round shot groups at each aiming point adjusting the rear sight until the center of the shot group and the aiming point coincide at each range. The firer should zero first at the shortest range, and then at each succeeding range. The firer's initial serobg for each range should be accomplished from his most stable position. He should then zero from those positions and ranges that are most practical. There is no need to zero from the least steady positions at the longer ranges.

Figure 252. Chert 3. bullet velocity vertut range.

Figure 252. Chert 3. bullet velocity vertut range.

RANCI (NXhn)

figón 152. Chart 4, rim* ofbaiUt travel v*rau» rang».