Holster size for compensated 1911?

[Elkins45]

I'm looking to buy a cheap nylon shoulder holster to cary my 460 Rowland 1911 conversion in the woods. The Uncle Mikes size 5 fits regular 1911's but I don't know what effect the added 1.5" of the compensator would have. I thought maybe the size 3 holster for 6" revolvers might be a better fit.

Any firsthand knowledge or speculation?