ORIGINAL: blacksheep1998
Strange I had that first Iron there, it takes a while for it to heat up, but then solders fine.
For my bullet connectors I used the method posted above vice-grips to hold the connector, but I apply the iron to the side of the connector, flow the solder, then put the wire in and fill it up with solder.
Pete
I do the same as blacksheep1998 with the addition of Tin the wire before you do anything else.
Tinning the wire (heat wire up and allow some solder to wick into it) not only makes a better connection but a small amount of sloder wicks up the wire into the insulation to provide support so the multi strands do not fray later on.
I use hemostats to hold my connectors and a 30W iron. It is a pain and I should get a better iron but it does the job. Yes it has to be clean and I melt a layer of solder right on the tip to help transfer the heat.