I am new to carbon arrows and would like to give them a try. I shoot a Martin Savanah, 45lbs @ 28" ... my actual draw length is 27.5". I am looking at the Carbon Express Heritage arrows ... can anyone give me some help on arrow size (150s?) arrow length, point weight, insert weight, etc. to help me get close to the correct spine? Any help would be greatly appreciated!

not a CX shooter, but youll want a 600 spine arrow with light tips (80-125gr) or a 500 spine front loaded with 100 gr brass inserts and play with tip wgt.

with carbons, ALWAYS leave them long and cut to tune. A half inch change in shaft length can have rather dramatic dynamic spine effects. remove a quarter inch at a time from a bare shaft till you get the flight you seek. It has been my experience that longer is always better when it comes to carbons. ymmv

I always used gold tip wieght system with 500spine. That way you can play around with the spine by adding wieghts to back and front


But I just went back to alums, just made sense for me.

I shoot a set up about like yours. go with the 90 shafts, dont fool with brass inserts you can use the normal insert and then try a 150 grain and 175 grain field tip, I think one of those will work then get the Wensel Woodsman broadhead in the same weight and you will be set.

The Heritage 90 with a 175 point will shoot like a laser. The Heritage 75 with a 125 will impress you if you would like to go a little lighter on point weight. According to the math the Heritage 75 cut to 28 ½ would be the correct spine for a 125 point with your set up.
Take the advice of Dalebow and don’t start messing with weighted brass inserts. With some manufactures the thinking is they can produce one or two shafts that will work with all poundage bows. You can go that route if you want your arrow so front heavy it drops slam out of site at 20 yards and add an additional cost for the inserts or about another 10 to 12 bucks a dozen.
There should be no need for them if you have the correct spine to start with. Leave them full length and cut them back until you get the desired results using the point weigh you like.

The Heritage 90 with a 175 point will shoot like a laser. The Heritage 75 with a 125 will impress you if you would like to go a little lighter on point weight. According to the math the Heritage 75 cut to 28 ½ would be the correct spine for a 125 point with your set up.
Take the advice of Dalebow and don’t start messing with weighted brass inserts. With some manufactures the thinking is they can produce one or two shafts that will work with all poundage bows. You can go that route if you want your arrow so front heavy it drops slam out of site at 20 yards and add an additional cost for the inserts or about another 10 to 12 bucks a dozen.
There should be no need for them if you have the correct spine to start with. Leave them full length and cut them back until you get the desired results using the point weigh you like.

Sorry for the double post.