On the trapdoor above the normal piston, behind where the snow is, there needs to be a snowman in a minecart pushed forward just a little. It also needs to be built facing east or south. From the back part where the chests are, go four chunks away, and this all needs to be built on a chunk border.

The stonecutter needs to be in the lazy chunk. In the droppers at the top that are going into each other, place one junk item (stackable). In the dropper at the very bottom of the build, place one more junk item. Then, in the dropper that goes into the double chest, is your area of explosion. Whatever you put in there, it’ll use, but you need to make sure they’re multiples of 15, or just put 60 items in at a time.

In the double chest at the top is how far you shot out before it loads the payload. Per one item, it’s 2 blocks out. That’s pretty much it, and here’s the video that I used to make it. By no means do I claim this as an original build.

Credits: https://youtu.be/hWwCl08IfPo