unfortunately, there is a possibility of missing the desired value.
That said all no? The possibility of missing the target value with bigger keys is great.
many test was. real steps to find was different.
22-bit at this test is:
1011011110010000001111
777854but anyway its better vs range(2**21, 2**22-1)
Lets say this is a private key, 3857991093436143 and you only know it starts with 3, that's all. Now that you have no other knowledge about the key other than what it starts with, can you give us a %100 working method to reduce the size of that key and still finding it successfully?
If you can do that, congratulations because you just partially broke elliptic curve.