You can replace the file "Shells.zon". But this file is also shared with some part of the ASW mod in Rub 1.44. (according to Rub 1.44 readme) So you will loose another feature in Rub 1.44 if you do this.
To give back the shell damage as in stock game and keep the other feature in this file, you need to hexedit that value back. And I can't do hexediting.
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