I just checked this out and I don't think you entered the parameters correctly. If I check off the last choice for each question, it'll give me a "Yes" answer for this conversion, but in reality, the action length won't support this conversion. I wouldn't trust this as a guide because it dosen't ask any specific questions as to exactly what rifle action you are starting with.
If you don't believe me, take the rifle to a gunsmith and ask him if it can be converted to .50 BMG, and don't be surprised if he laughs at you.....
>What type of conversion do you wish to investigate?
ReChamber (reboring optional) - Your chamber must have enough metal to form new round
ReChamber (no reboring) - Same as above but bullet diameter must stay the same
ReBarrel - Existing chamber dimensions are ignored
Will your gun's boltface/extractor be modified?
No - Same bolt/extractor will be used
Yes - Bolt/extractor will be modified (Lists rounds with wider/different type rims)
Can your action/magazine support a longer cartridge?
No - Keep same max case length (or shorter) as original round
Yes - Increase case length by inches (Example: .25)
Disregard - Show all candidates, regardless of length