Can you take out the aluminum insert and replace with a heavier steel insert? I thought I remember seeing a 100 grain head without an insert on 3 rivers but not now.
Yes, you could. Just don't heat to much. They sell them both ways.
The best way is to just get them without the adapter. The adapters are epoxied in and requires a lot of heat to get them out. 3 rivers dosnt have them without the adapter, but you can get them from medicinebear.net