I have a 2004 Mighty Mite and a 2004 Patriot. Both are Single cam infinity VFT models with 70# limbs.
Because of health reasons I have to reduce to 60 #.
I wanted to reduce one bow initially but I wasn't sure which one so I emailed Bowtech and asked if the limbs on these two bows are the same. Their reply stated "ifyour patriot is asingle cam model they will both take the same limbs to make them 60# which would be 13", 71 deflection". This is an EXACT quote from their email.
I found a pair of 60# limbs on Archery Talk but haven't received them yet.
They're supposedly correct-we'll see.
Regarding Barnsdale Limbs- I called (906 774 1010). Send them your bow and for $150 plus return postage they will make and install their limbs. This sounds like a great deal. They have a great reputation. Factory limbs are $130 to $ 150 uninstalled from a Bowtech Dealer.
P.S.-you must set your bow to factory specs before you send it to them.

Another option is to sell yours and buy a used 60#bow.

Sorry for the rambling-too much time on my hands. (Recouperating from that health thing mentioned earlier.)