Here's some testing I did this summer since I needed to figure out what conical I wanted to use here in Colorado. The 385 gr Great Plains is pretty impressive. The test was shooting into a 5 gal bucket full of wet newspaper with a piece of 3/4" pressure treated plywood about 2 inches into the bucket and 2 inches of sand in bottom of the bucket. Distance was 100 yards, The Great Plains not only passed through, but expanded to almost twice it's original diameter. Have since also shot Powerbelts 348 gr lead hollowpoint. It performs almost as well as the Great Plains and mushrooms nicely. Just for grins I also shot my handloaded .308 (41.4 grains IMR 4895 & 180 gr Silvertip) in to the same setup and the penetration was not as much as the Great Plains or Powerbelts. At 100 yards, these muzzleloaders pack quite a punch!