I ran into this yeas ago when shooing at a indoor range. I started printing my own targets and was getting the tears. I tried a lot of different weight papers before I found one that did good. If I recall it was > 34#. I also found out a lot had to do with the humidity. Try some heavy weight poster board if you want to confirm. A true WC will produce a cleaner hole than the SWC. Some of the SWC have a simi rounded nose and not flat.