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to get this magnification 400X ie with a 10" dob, i would have to put my 6mm eyepiece in and then use another eyepiece called a barlow to magnify the image x2. at the moment, i can get around 200X
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It's also worth noting that you'll rarely use magnification like that. The "seeing", or atmospheric turbulance, is rarely good enough to be able to support that magnification and still get an acceptable view.
In bad seeing, pushing the magnification will just give you a blurry disc that you feel isn't coming to focus.
Most times you'll use between 100-200x magnification depending on the object you're looking at. Viewing star clusters or wide starfield views, you'll even use as low as 39x.