I have those exact same calls. I use them all the time with great success here in Vermont for guiding hunting clients and my own personal hunting trips here in the North East. I carry them with me always when I am in the deer woods.

The buck grunt has worked for me many times to bring bucks in closer. I give you a short story of one of my youth deer hunting clients back in 2010. Very early in the morning hours opening day youth weekend in Vermont, we could see the silhouette of a big body deer out at one hundred yards moving swiftly across the meadow. When the lights came on we saw a few young doe's move through on the other side of the meadow about 250 yards away from us. From intensively scouting this area, I knew there were two good bucks using this area as they were hanging out together in early season. After a few minutes passed we saw a great buck on the same trail that the doe's took earlier, with his nose to the ground. With the buck out at 250 yards, it was just not a shot that the young hunter was confident in taking. I took out the grunt tube and grunted once, no response. I grunted again but a bit louder. He raised his head as though he had heard me and stopped moving. I then grunted again, which sent his ears flat back and his hair all raised up in aggression. He broke into a trot at one point closing the 250 yards to 120 yards very quickly. I told the young hunter, that was a very good shot at one hundred yards, that when he crests the knoll in front of us I was going to grunt again to stop the buck for a shot. I grunted, but the buck kept coming. After many grunts in a very short amount of time with no success, the buck was approaching the 15 yard mark and still moving to us. A moving target shot was just not a good decision as the young hunter had not practiced a moving shot. So I bleated with my mouth, with the buck at 10 yards and he stopped. I whispered "right behind th...." BANG! The buck went 20 yards and landed in a heap. This was the first deer this hunter ever killed, and it would not have happened without that buck grunt tube.

I like to bleat like a fawn or doe with my mouth instead of a store bought call. I have been in the woods some much that I have had the chance to hear these calls many, many times. So I try to recreate those sounds. I find that any call works well after you have heard the deer make that call noise, and you talk back to them. This includes buck grunts.

I do some light rattling in early season about 1 minute sequence every hour or so while on stand. As the season approaches the rut, I bang the rack pack harder to simulate a full fight. Most real buck fights only last a minute or so, so that is what I do. What you see and hear on TV is not real most of the time with the ten minute rattle sequence. I have never heard a fight last that long, doesn't mean it does not happen, but like I said I recreate what sounds I have actually heard in my woods.

I hope this helps a bit, and if you are not sure about something I have talked about, just ask me in PM and I will try to explain. Good luck to you this season!