The following are replies from Topic 'paper patch 45/70' between RD & Pete, referring now to a new topic concerning abrasion of paper. Any other inputs welcome. Pete:
" I kinda like the way your bullets are lubing up. For me one of the things about PP'ing is the erosive nature of any kind of paper you'd use."
Never heard that paper patching causes erosion. Where can I find documentation for this?
Proof, as far as I'm concerned comes from personal experience. I've got a .45/70 Navy Arms Roller that I've shot several thousand rounds thru. When I got the gun you could see the reamer marks on top of the lands. Now that nore is as shiny and free of marks as a mirror.
For 30 yrs. I also worked n the valve business. In the paper making process paper slurry is considered to be about the most erosive mix there is.... and this has a high percentage of water to dampen the action. 17-4PH was especially developed to stand up to this slurry mix. Plain steel or stainless steel valves will erode out in less than 6 months. 17-4PH valves will stand up longer but are not immune to this erosion.
So I would say that altho slurry moves thru the pipes at a good clip it's no where near as fast as as bullet going thru a barrel. Modern steels will hold up longer than the old soft steels of yesteryear but aren't immune.
Without proof I would say that if a good lube can be put between the bullet and barrel so much the better. Just like it's better to put a lube between a standard GG bullet and the barrel. We all know what happens when you don't, or the lube fails to do it's job.
I have seen the question of what effects PP has on modern gun barrels come up occasionally. And it seems that no one has any definitive answers. At least that I have seen. I think that the abrasiveness of some types of paper is pretty well established. It can be used to polish a barrel before blueing or a gunstock finish and dull cutting edges. And, PP does polish a bore over time as do lead bullets. A shooter friend's son is in the paper industry. And as I understand it, the composition of different types of paper can vary a lot. From various mixtures that use clay as a filler to 100% cotton bond which has no fillers.
Erosion and abrasion are two different processes. The questions seems to be, is this abrasion significant over the normal life of a rifle bore? And, do different papers have different abrasion levels? I for one, certainly am not going to intensionally shoot out anything that is going to erode the bore. However, abrasion is another animal. So, I use nothing but 100% cotton bond for PP.
This should probably be a separate topic and I would be interested in hearing more on this subject.
Last edited on Fri May 16th, 2008 03:01 pm by