If I am understanding correctly, sometimes a slim to none option.
The following can be rebarreled to 6.5x55Swede .476" 3.03" with a barrel swap. Because bolt face diameter is close, and operating under the assumption that american 6.5x55 have a .473" bolt face, Lapua Brass is .476" and cases where bolt face diameter are few.
And, the following will work magazine wise because of OAL.
SMALL BORES
224Clark .473" 3.08"
240WbyMag .473" 3.08"
240Apex (BeltedNE) .475" 3.21"
25-'06Rem .473" 3.25"
6.5x55Swede .476" 3.03"
6.5mm-'06A-Square .473" 3.2"
270Win 473" 3.35
7x64Brenneke .473" 3.3"
280Rem .473" 3.33"
30-'06Springfield .473" 3.34"
8mm-'06Spr .473" 3.18"
8x60S .473" 3.1"
MEDIUM BORES
Caliber Case head (inches) Length (inches)
338-'06A-Square .473" 3.34"
35Whelen .473" 3.26"
9.3x62Mauser .473" 3.29"
Note: If I ever run across a 35W and buy it, it won't be for converting.