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I did the same initially but was also concerened about the added wear and tear on the trimmer.
I now do, essentiually, the same thing except with a drill press. I purchased a cheap drill press vice and closed it snug, I then drilled a hole, slightly smaller than the base of the .223 brass, centered between the two jaws, and only about 1/2 way into the jaws. I then purchased a cheap 1/2" end mill (which is desigend very similar to the cutter on the trimmer) for about $10 and set the stop on the drill press so that my .223 brass is trimmed slighty longer or at the length that I want my finsihed 300 Whisper brass (it will lengthen slightly when formed). I centered the hole in the drill press vice under the mill and I then trim as many as I need using the vice as a quick clamp. I can do several hundred in an hour. I then form and size in the conventional manner and do a final quick trim with the case trimmer just to square everything up.
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