As for the Investarms manual.. Lyman is made by the same company. Investarms, & Lyman rifles are the same as those sold under the Cabela's name actually. If you look in the Lyman manual (which also comes with an Investarms Manual when you purchase a Lyman) they give a much more generous powder charge for their .50 calibers and .54 calibers, but I checked my Lyman Manual and there is no information on a Lyman .45 caliber.