A friend of mine shot one through the upper leg bone of a whitetail,breaking the bone in 3 pieces,using a long bow in the low 40 # range.it almost knocked the deer down.He uses what most consider very heavy arrows,app.700 grs.
I shot an antelope last year with one of the 190 gr Grizzlies and a 709 gr arrow out of a 53# Mojo Stik.It hit the heavy end of the humerus bone,just forward of the elbow,severed it,clipped the heart and exited the opposite upper leg but missing the bone on that side.
They can get as sharp as any other broadhead once you get the hang of it.You should be able to find more than one old thread here on how to do it.
I have had good luck using the KME knife sharpener.Recently,I bought a large,3"x8",coarse diamond stone(actually a steel bar,not stone)and have been using it with the KME broadhead sharpener and find it even easier though the diamond stones are expensive.
Whatever method you use you just have to stay with your file or coarsest stone untill you have developed the bevel all the way to the very edge,from front to back and don't progress to the next finer stone till you have developed a burr the full length.Then you can go through your other grits and finish by stropping to remove that final burr.
The ones I've done recently are honed to where you can see your face in them and are as sharp as any blade I have handled.It just takes a little getting used to.
I'm waiting on a new,extra coarse diamond "stone" which I think will speed up the process and if it goes well,I'll post the results.
Check out those KME sharpeners.Ron is more knowledgable on than anyone I know.You have to handle a Grizzly that he has sharpened to believe it.
The Grizzly is a very tough broadhead that holds an edge well.It just takes a little work and care to get the right edge but it is worth it.The new ones make the job easier but it still takes a little effort.Once you get that edge established with the file or coarse stone,it goes a lot quicker from there.
Cottonwood,you have a good friend there.