You want to fill the lighter with liquid butane, not gas, which is less dense than the liquid. That is why you fill with the refill canister pointed down, so that the gaseous butane and propellant goes to the top of the refill canister and the liquid butane at the bottom flows into the lighter rather than the gas and propellant.
Getting the lighter really cold in the freezer first helps the liquid butane stay liquid as it flows in rather than turning into gas when it hits a warm lighter tank. And as greeneyes mentions, it lowers the chamber pressure. Another way to get the lighter cold is to refill it just a little and then purge it before refilling it completely. Obviously, this second method is wasteful. This second method is a best practice for filling CO2 tanks. With CO2 tanks, which are larger than lighters, you can tell if a method is effective because you can weigh before and after to see how much you've managed to fill the tank. A cold tank will fill up more than a warm tank.
Getting the lighter really cold in the freezer first helps the liquid butane stay liquid as it flows in rather than turning into gas when it hits a warm lighter tank. And as greeneyes mentions, it lowers the chamber pressure. Another way to get the lighter cold is to refill it just a little and then purge it before refilling it completely. Obviously, this second method is wasteful. This second method is a best practice for filling CO2 tanks. With CO2 tanks, which are larger than lighters, you can tell if a method is effective because you can weigh before and after to see how much you've managed to fill the tank. A cold tank will fill up more than a warm tank.
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