snip..

Ancestry transcribed the town he originated >from (his residence)as:

Radsewelsch, Russland (Russia)

I would say: Radsewitsch

However, I cannot find any town that resembles that name.

Russia is not a fixed place during the ages.
<http://www.jewishgen.org/communities/LocTown.asp>
[using Daitch-Mokotoff Soundex]
gives so many possibilities.
To name a few:

Radzewice populated place
52°13' N 16°59' E
Poland
170.0 miles W of Warszawa 52°15' N 21°0' E

Radevichi, Radzeviche populated place
53°31' N 23°45' E
Belarus
158.5 miles W of Minsk 53°54' N 27°34' E

Radzeviche populated place
53°23' N 24°08' E
Belarus
144.7 miles WSW of Minsk 53°54' N 27°34' E

Racewicze Pierwsze, Ratsevichi, Ratsevichi Pervyye populated place
54°33' N 26°36' E
Belarus
59.2 miles NW of Minsk 53°54' N 27°34' E

Rausowitz, Rousovice populated place
50°21' N 14°30' E
Czech Republic
18.5 miles N of Praha 50°5' N 14°28' E

Rodzevichi, Rodziewicze populated place
54°16' N 27°45' E
Belarus
25.9 miles NNE of Minsk 53°54' N 27°34' E

Rodzevichi, Rodziewicze populated place
54°33' N 26°39' E
Belarus
58.2 miles NW of Minsk 53°54' N 27°34' E

Rácovice populated place
49°01' N 15°41' E
Czech Republic
91.5 miles SE of Praha 50°5' N 14°28' E

Evertjan Hannivoort.
The Netherlands.
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