There really is nothing wrong with bottling with beer bottles and caps! Of course, for long term storage, you know you want the traditional way of corking and keeping the cork moist and storing at cellar temps. But, if you're drinking it in a short time frame, I don't think you'd have any problems at all. Now, I can't define "a short time" for you but would guess 6 months to a year would be fine.
For my Welch's wine, I bottled and corked some, but used Grolsch bottles for others. It's a wine meant to be drunk young, so there were no problems. I think it's more of a aesthetics issue for young wines- something about displaying a gorgeous clear bottle of wine, uncorking, and then pouring that is such a treat for the winemaker! I have 375 ml wine bottles, 750s and 1.5 size bottles, so I've never used regular beer bottles but I know that people do it.