Designing the 2-diameter paper patch bullet.

[AzTBH]

Jim

Thank you for starting this post on your design efforts of a 2-diameter bullet. I for one, with my limited paper-patch knowledge, very much appreciate that shooters like you and Arnie Seitz (aka beltfed) are graciously sharing your experiences and knowledge in your design efforts. In addition to the design aspects, your "There are basically three types of paper patched bullets” post was extremely helpful in helping me understand the differences between the three designs, their applications, and the advantages of the 2-diameter bullet.

The 3D model drawings in post #6 (.40 cal) and #7 (Matt’s .45 cal) were also helpful for me to visualize the bullet with a long freebore chamber (.40 cal bullet) and a no free-bore chamber (only a .125 throat) bullet for Matt’s rifle. A chamber cast of my 40-70SS indicates that the throat is only 0.050 in length, and no free-bore.

In addition to your technical expertise, I also enjoy your dry sense of humor. I almost sprayed my computer with a mouthful of Einstein Bagel coffee reading “Don't ask how I know that, I just do” comment following your statement "I know that with my bore diameter bullet in my .45-70 just the primer alone is enough to move the bullet about 6 inches into the barrel.”

I have a couple of questions:

1) Do you wet-wrap 2-diameter bullets? It seems that the wet paper would conform to the transition slope between the two diameters better than dry paper.

2) In the .45 caliber bullet drawing (Post #7) is the bullet patched to the dotted line in the center of the bullet (which looks like the start of the ogive)? Or does the paper go slightly higher (i.e. the first solid line to the right of the dotted line)?

Again, I do find this subject interesting and informative and will continue to follow the discussions. Please keep us updated on your experiences, Matt’s design, and other pertinent information on this subject.

Good Shooting,
Ross