The loss due to the effect of the spring constant as determined by the method of step 4 is only about 0.089 foot per second. The final barrel motion curves shown in fig. 2-24 are the result of performing steps 2 and 3. Since the velocity loss due to the cffcct of the spring constant is so small, it is not necessary to take step 5..

Having the final barrel motion curve for the interval between unlocking and the start of acceleration, it is now possible to draw the free bolt velocity curve for this interval. This portion of the free holt velocity curve is plotted from the data shown in fig. 2-22 by adding to the ordinates of the retarded barrel velocity curve the corresponding ordinates of the curve in fig. 2-22, measuring these ordinates above the zero axis. The resulting free bolt velocity curve is shown in fig. 2-24.

The retarding effect of the bolt driving spring is determined by the same methods employed for the barrel motion curves. The loss in bolt velocity due to the corrected initial compression of the bolt driving spring is:

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