I get asked that question a lot.
I am not sure why because when it comes to calling them in there are a lot more important questions to ask.
Some popular calibers are .204, .223, 22-250 (which is a very fast round) and .243. Now days you have new rounds like 22 Arc and 22 Creedmore.
I agree with Andy a 22-250 wallops them good. If you can get them to the call a shotgun with #4 buck is the best thing.
Another common question I get asked is what sound are they coming to. I can honestly say there are none that are special. Trigger there reason to answer the call and they will come. Whether it’s hunger, social or competitive. I always like the hard chargers that show up in less than 3 minutes. I don’t think it would matter what sound you play then.
I hunt public land 95% of the time. I don’t do much calling in MN but when I do it’s on private for the most part.
This is my favorite area to call. It has national grassland, private opened up to walk in access and state trust land mixed in with private and tribal lands in the area.
I try to have areas I can make 10 to 15 stands a day with an average on time of stand at 12 minutes.