The 175 has a more powerful round than an 8" due to the exploding charge being composition B rather than the TNT of the 8".
We usually had 2 carriages tubed with 175 and at times had a tractor trailer with 8" tubes and the ordnance crew to swap them. It was a simple task that took less than 2 hours.
I recall one rainy night around Thanksgiving of '67 when we fired continuously to keep the enemy away from a Huey and crew downed in the An Lao valley. A 175 is good for only 300 full charge rounds so the next day we were changing tubes.
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