OF the bulls listed in my opinion EC NO DOUBT is the only one with suitable BW- EPD an enough accuracy to be reliable. The female you have would also make a difference ,consistency on most of the Charolais bulls BW has been a problem for years. The people that find reliable birth weight Charolais bulls will stay with the breed ,more challenging in the winter country where calf birthweights are bigger due to cold weather .... We have sacrificed some growth in our herd trying to get reasonable birth weights that are consistant ...Have been around Charolais since late 50's , had cattle from a herd in Kyle ,Texas an birth weight were not as big a problem till the French Charolais hit the Charolais breed.. They were bigger, not shaped for calving ,also had lot more bone an had some structure problems ...But every one wanted there cattle to grow faster , an we used them also , but that was when Charolais cattle birth problems
started . Thats my opinion , also back then most herds had Brahma influence, but that was one thing we never used where we lived up in the cold country an was not sure they would survive ....LT Bluegrass is also a proven calving ease bull that should work ....