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Skitter, your Hydrashocks are just one brand of JHP. They give it a cool name to help differentiate it from their competition, but it's still a jacketed hollow point.
To replicate commercial loads, while most of the time you can get an equivalent bullet, you'll have a tough time with the powder charge. You're not going to know what the exact powder is, because commercial ammo manufacturers don't use the cannister powders we do.
The best way to do it is to get a chronograph and measure how fast your commercial loads are out of your gun (average velocity of at least 10 shots). Then use your preferred powder to match that velocity.
If you don't want to buy a chronograph and can't borrow one, then try to match velocities using authoritative load data. By "authoritative" I mean data from Hodgdon, Alliant, etc, not data from Bubba's Shooting Blog.
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