the BP cartridge PPB bore rider
Quote:
Originally Posted by
BrentD
In a dead nuts 0.450" bore, I would consider 0.450- to be too loose. 0.449, definitely too loose. 0.451" is probably too tight and will wear out your thumb in a match.
The only really good way to measure the thickness of paper with normal measuring tools is to measure a bullet or drill bit shank with calipers or micrometer then wrap it with two wraps of paper and measure it again, just like you did before. Subtract the two diameters and divide by 4.
Measuring single sheets with calipers or normal micrometers is problematic in my opinion.
relating to brent's above post, i'd like to start a discussion of just what it takes to make an accurate PPB for a given rifle, and how to go about creating it. getting the *right* diameter PPB (meaning the paper wrapped slick) is probably the most intimidating part of loading accurate PPB bore rider, black powder loaded cartridges.
i'm hoping some of you most knowledgeable PPB aficionados would please weigh in.
the BP cartridge PPB bore rider
This weekend I will for the first time be shooting my cpa at a silhouette match. My friend made the barrel and best we can tell after lapping the bore is .4505 or so. That’s at the breach. It does have a slight choke so it will be a little tighter than that at the muzzle. My bullets are maybe between .450 and .4505 and they are looser than what they are in my green mountain barrel but not much. Just barley noticeable. All I have been able to do to this point is fire form cases and don’t have any real good indication on how it’s going to preform but we will know something this weekend. Anywho best I can tell my GM barrel is .450 BUT..... having said that I have never stuck a pin gauge in here to see what it actually is. At this point I am just going by feel.
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the BP cartridge PPB bore rider
They are .445ish before the patching. I am using the Seth Cole 55w paper. They chamber pretty easy. They are snug but not so loose that they will fall through the bore. Not so tight ya can’t push them from bow to stern with a cleaning rod.
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