Does anyone have a good idea on what to use as a backstoop for broadheads that wont ruin them or should I just save a cpl 3 just for that purpose/
You should probably share what type of broadheads, because my experience is with fixed blades only.
I tried the suggested rubber mulch packed into a bucket or cardboard box, but I didn't really care for it. I found the rubber mulch left a lot residue on my broadheads, & I was shooting a compound bow.
I prefer my Rinehart Rhinoblock. I have had same Rhinoblock for a long time, but I try to keep my broadhead shots to the removable insert. I try to buy Rinehart's cheaper blemished inserts whenever possible.
If I wasn't still happy with my Rhinoblock with removable inserts, I would probably consider the crossbow targets by BIGshot. The BIGshot Titan 10X HD Crossbow Target looks like it would take a lot of hits. I can't speak from experience on the BIGshot, but it looks good (better than the Morrell High Roller in my opinion).
Bottom line - broadheads are tough on targets, & bags targets simply don't work.
Our local archery range has raised platforms with sand piles to shoot broadheads into, but I typically practice at home.
The hunting arrows in my quiver have been shot with their current broadheads (125 grain Slick Trick Viper Tricks). I make sure every arrow/broadhead combination flies great with dull practice blades, & then I switch out the dull blades with sharp ones. This is probably easier to do with fixed blade broadheads. I don't trust practice heads.
Although I don't hunt with my crossbow, my approach would remain the same if I did.