I have a lot of rocks around my house. Generally, I drill holes with a rotary hammer and then use wedges and feathers to split them. There are some that are rotten, however, and the wedge and feathers just blow out. They are massive, and breaking then with a jackhammer would take a long time. Is there another option? I think that if I could saw them or something, it would be easier.
I found this video from PBS' "This Old House"
It appears that the OP tried the feather and wedge approach, however, they could try larger ones and more powerful hammer.... Basically drill holes, put the feather in, drive the wedge until it splits. The larger the boulder, the larger the feather and wedge and hammer force needed.