They say a picture is worth a thousand words, so...
Let's see some pictures of your BPCR drop tubes!
Gonna be loading soon for .45/70, and possibly .44-40 WCF in BPCR, so need to concoct a drop tube. I have a pretty good *vague* idea of what I want to build, but actually seeing what works for others usually saves mistakes, headaches and wasted materials as well.
Whattya got?