I have shot elk with Powerbelts and 300gr. jacketed hollow points. At 100 yards or less a 90gr. charge of Black Mag'3 will send the bullet completely through a fair sized cow elk chest cavity. Unfortunately the lighter bullets do not seem to drop the animal very quickly. I have had to follow them for between 100 yards to 1/4 mile after a double lung shot and had them still standing when found. I am now working on 465gr. solid lead conicals as the proper bullet to use as I believe they will penetrate as well or better if the bullet does not get a clear shot through the chest and if the shoulder is hit they will likely outperform the Powerbelts. If you are after a bull I also recommend the heavier solid lead conical. If the range is 100 yards the load of powder does not have to be huge. Big bullets going slow do a lot of damage.