So here is the marinade recipe (and really I just squirt the condiment into the pan or bowl that I am marinading the steak in and eyeball it):
1/4 c ketchup
1/4 c bbq sauce
1Tbsp mustard (I used spicy this time, but you can use whatever kind you want :)
2 Tbsp Worcestershire sauce
1 tsp liquid smoke
1 tsp garlic sale (or 2 chopped garlic cloves)
1 tsp onion salt (or 1/2 of medium onion)
1 Tbsp A1 Cracked Peppercorn Dry Rub (if you don't have this I would just use pepper)
Stir all the ingredients (without the steak) together in your marinade bowl.
Then take your steaks and put them in your marinade.
Now this is the part that really makes the steak yummy and tender: Poke the crap out of each steak with a fork. Make sure that each steak is evenly coated in the marinade.
The more you poke the steak the more flavor/tender the steak.
After letting your steak sit for awhile (at least 2 hours, but 24 hours would be even better), grill it to your desired doneness.
PS. A little tip someone told me when my husband first started to hunt...Onions take out the gamey flavor.