Five of the six shots hit the third target where the angle of movement of the weapon was small.[C4-804] On the basis of these results, Simmons testified that in his opinion the probability of hitting the targets at the relatively short range at which they were hit was very high.[C4-805] Considering the various probabilities which may have prevailed during the actual assassination, the highest level of firing performance which would have been required of the assassin and the C2766 rifle would have been to fire three times and hit the target twice within a span of 4.8 to 5.6 seconds. In fact, one of the firers in the rapid fire test in firing his two series of three shots, hit the target twice within a span of 4.6 and 5.15 seconds. The others would have been able to reduce their times if they had been given the opportunity to become familiar with the movement of the bolt and the trigger pull.[C4-806] Simmons testified that familiarity with the bolt could be achieved in dry practice and, as has been indicated above, Oswald engaged in such practice.[C4-807] If the assassin missed either the first or third shot, he had a total of between 4.8 and 5.6 seconds between the two shots which hit and a total minimum time period of from 7.1 to 7.9 seconds for all three shots. All three of the firers in these tests were able to fire the rounds within the time period which would have been available to the assassin under those conditions. Three FBI firearms experts tested the rifle in order to determine the speed with which it could be fired. The purpose of this experiment was not to test the rifle under conditions which prevailed at the time of the assassination but to determine the maximum speed at which it could be fired. The three FBI experts each fired three shots from the weapon at 15 yards in 6, 7, and 9 seconds, and one of these agents, Robert A. Frazier, fired two series of three shots at 25 yards in 4.6 and 4.8 seconds.[C4-808] At 15 yards each man’s shots landed within the size of a dime.[C4-809] The shots fired by Frazier at the range of 25 yards landed within an area of 2 inches and 5 inches respectively.[C4-810] Frazier later fired four groups of three shots at a distance of 100 yards in 5.9, 6.2, 5.6, and 6.5 seconds. Each series of three shots landed within areas ranging in diameter from 3 to 5 inches.[C4-811] Although all of the shots were a few inches high and to the right of the target, this was because of a defect in the scope which was recognized by the FBI agents and which they could have compensated for if they were aiming to hit a bull’s-eye.[C4-812] They were instead firing to determine how rapidly the weapon could be fired and the area within which three shots could be placed. Frazier testified that while he could not tell when the defect occurred, but that a person familiar with the weapon could compensate for it.[C4-813] Moreover, the defect was one which would have assisted the assassin aiming at a target which was moving away.