Level 1 (one loadout point)-The radius of your explosives is 20% bigger, The radius of the Molotovs is 10% bigger.
Level 2 (two loadout points)- The radius of your explosives is 40% bigger, The radius of the Molotovs is 20% bigger.
Explosion Expert grants users deadlier explosives. This is particularly useful when on the losing side during a match, as losing players are granted better crafting items (and sometimes explosives themselves) from lockboxes.
The Launcher, Molotov Cocktail, and Nail Bomb all benefit from using this survival skill. Bomb Expert works well in tandem with explosion expert by decreasing the time between when bombs are activated and when they explode, leaving less chances of the enemy escaping the blast (because of Bomb Expert's shorter fuse) and wider blast radius (because of Explosion Expert) which may also down the enemy's teammates if they are nearby.