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Hornady book does not list H110 for a 180 gr bullet.
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No they don't but the Hornady 9th does list H-110 for their 200 grain XTP and for that bullet, loading H-110 they reflect 22.6 grains as a Start and a Maximum Load of 29.3. With the lighter 180 grain XTP I can see similar loads being safe and effective. Their test rifle was a Ruger 44 Carbine same as you are using.
Slightly off topic I have a Ruger 44 Carbine and it was my favorite W. Virginia go to hunting rifle. Over all the years I tried a variety of bullets and always ended up going back to the standard 240 grain Hornady and Speer flavors. Maybe you will do better with the 180 grain lighter bullets than I did. I always liked using Magnum Primers with the ball type or spherical type powders too.
Ron
Ron