I can achieve it with my electric drill (just) but the drill has to be run very slowly or the bit will wobble like buggery due it's length and narrow diameter. So, it's just as easy going old school. I can't imagine the 300mm in and electric drill!

I am sorry but after reading your comment I thought you were having trouble with using such a long drill as you said you could not imagine using it in a electric drill. The orientation either horizontal or vertical wont make it wobble more in one direction than another but if it is bent, the shaft that is the chuck is damaged or held in a chuck that isn't in working order that will make it wobble but seeing as most cordless drills run about the 1500 rpm mark and I can run it at 6000 rpm then obviously there is something wrong with your setup. I have drilled a lot of holes with my drill using a cordless drill running it at 1500 rpm and it runs without any wobble.