I have landmines that can be picked up and thrown - effectively being used like a grenade.
If you play with adjusting the settings of both entities in their editor properties you should get it to work.
Not sure it would - but if you look at some of the default explosive objects and study their script files/place some in a test level and view how their properties are set up to see if you can see how they might differ from your entities set ups then you may discover where you need make adjustments.
Look carefully at all the settings - try and think logically.
It can work - some adjustments to entities properties should do it.
I would suggest that if you continue to find difficulty - then forget your game scenario a minute and just get things set up say so that you can make the explosive objects actually explode individually.
For instance if you make all of the separate explodable objects so that you can pick them up and throw them at a wall do they explode?
If they do then you that part is proven so you move on to another possibility.
In an explosive entities settings try adjusting the physics settings - and pay some attention to both the weight and friction as well as everything else.
If you really get stuck make some large adjustments rather than small ones that sometimes helps as sometimes a setting may be a just tad away from success and adjusting by small amounts one can get frustrated assuming its never going to work - large variations can sometimes bring a visual change in behaviour to the front quickly.
Keep at it and you will get there.
Note : before changing any settings its worth noting the defaults first so you can reset them if necessary.
Tip : I try to take a screen shot of entities properties settings in editor - then I print them and file them so I can refer in future - very useful once yove cracked a problem - by saving a copy of your entities settings - you wont forget them if you keep adjusting later and forget the settings when something may have worked previously and then does not. Keeping a copy of them also helps a great deal by not having to open other levels consatntly to check some entities settings you adjusted and set up previously in another level.
Hope that helps.
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