I personally don't like the 135gr Federal Hydra Shok is to light for my taste. I shot quite a bit 4-5 years ago when I got my first .40, and while nice and mild, I found I liked the heavier/slower rounds better, and still prefer them today.
The 135gr is a "medium velocity" load. It's for some or other LEO contract, so if CTD has it, probably an over-run. Everyone has a different opinion, especially when it comes to .40. I'd pick the 155gr of the two.
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