This is just a quick estimation of the size of the explosion from Naruto's chou rasenshuriken. I made a line for the length of rasenshuriken and tilted it to make a horizontal line to make it easier to measure in photoshop.
Here's Naruto's basic rasenshuriken which he used against the third Raikage.
The expansion from this explosion is roughly 15 times the size of it when it's compressed.
Now looking at chou odama rasenshuriken.
It's length is roughly 3 times the width of Gamakichi. who is around the same size as Gamabunta who is around the same size as the 1 tails. So if it's explosion would be 45 times the width of gamakichi.
Disclaimer: These numbers aren't accurate, they're only good enough to get a rough scale of this technique.
Here's Naruto's basic rasenshuriken which he used against the third Raikage.
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The expansion from this explosion is roughly 15 times the size of it when it's compressed.
Now looking at chou odama rasenshuriken.
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It's length is roughly 3 times the width of Gamakichi. who is around the same size as Gamabunta who is around the same size as the 1 tails. So if it's explosion would be 45 times the width of gamakichi.
Disclaimer: These numbers aren't accurate, they're only good enough to get a rough scale of this technique.