Ignitable Capsule Rounds

I read about gasoline in capsule rounds here https://www.reddit.com/r/Shadowrun/comments/2tfzp5/micro_flare_gasoline_filled_capsule_rounds/ and wanted to try it myself, but my gm says that the gasoline would explode/boil on firing due to the heat of the bullet.. any ideas for other flameable liquids with higher boiling points? A bullet reaches 100 - 300 °C, gasoline boils at 80 - 200°C.