Quote:
Originally Posted by colmurph
the 175mm is a howitzer not a gun. It is designed for high angle fire. Guns are designed for direct fire (like the gun tube in a tank turret) it has a "tube life" of about 90 rounds at maximum charge, which means that the barrel has to be replaced after that many shots are fired because it isn't 175 mm any more. More like 178mm because the heat and pressure cause teriffic erosion in the barrel just in front of the powder chamber. After 90 rounds at max range the howitzer is no longer accurate. At reduced charges the barrel lasts a little longer. I think that 5 charge 5 shots equal one charge 7 shot. So if you fired all your rounds at charge 5 you should be able to get 600 shots off before it's time for a tube change.
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colonel, my m107 in nam was in fact a 175 gun. We could get 200 rounds at max three charge. Changing the tubes was a 2 hour job.