Data collection returned 61 listings for Musket Ball (many are multiple lots though). At the end of November 2014, the PAS contained 1808 examples. So, in a month, eBay lists material equivalent to 3.4% of the PAS and would take 2.5 years to sell the same amount.
8 BRITISH CIVIL WAR PERIOD LEAD MUSKET BALLS DETECTING DETECTOR FINDS
13 OLD MUSKET BALLS
22 MUSKETS BALLS FROM yorkshire 20mm DOWN TO 5mm METAL DETECTING FINDS
25 CIVIL WAR MUSKET BALLS
50 MUSKETS BALLS – all from ESSEX 18 mm 6 mm approx. METAL DETECTING FINDS
1640s ~ excellent 10 x Charles I English Civil War musket balls (Arundel Castle)
1715 Fleet Shipwreck Musket Balls Split Shot Minnie Ball Found By Lou Ullian
1715 TREASURE FLEET’S CABIN WRECK MUSKET BALLS
ANTIQUE JAPANESE MUSKET BALLS OR GRAPE SHOT-16th-17th century
Collectable dug old English Musket Balls Lead pistol Shot x 6 – 16mm Diameter
DUG LARGE LOT OF MISC ANCIENT ROMAN LEAD ARTIFACTS & TOKENS MUSKET BALLS
English Civil War Lead Musket & Pistol Balls
English Civil War Lead Musket Ball – Oxfordshire Found
Fantastic lot 10 lead Musket Balls Napoleonic Wars 1811
Flintlock Double Musket Ball from 1758 HMS Invincible ShipWreck
Lead Musket ball Gun Powder Measure Civil war battle metal detecting detector
Lot of 15 musket balls from Amsterdam 18th century
metal detecting find old musket balls and other iten mixed lot
Metal detecting finds buttons buckles seals badges metal detector musket balls
Metal detecting finds coins seals metal detector musket balls
metal detecting finds job lot large musket balls
Musket Flintlock pistol balls
MUSKET BALLS & 19th CENTURY LEAD BULLETS
Musket Balls Bullets Detecting Finds From Kent
Musket balls metal detecting find
musket balls various lead shot x 55-uncleaned british metal detecting finds
Musket balls
Spanish Musket Ball From The Atocha Treasure Galleon Mel Fisher Free Shipping
Two Musket balls metal detector finds
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Public Archaeology 2015 
This is an incredibly interesting approach, all sorts of jumbled ideas about sites of musket engagement sites whirling round with the cult of collecting and cottage industry at this end…
Really interesting idea, but have you had anyone question whether it is an invasion of privacy to post these pictures? How are you dealing with anonymising the houses that you are showing?
Hi Suzie. All of the pictures are screen-grabs from Google Maps, cropped to exclude any information that would identify specific locations. I also chose to not connect these images directly with sellers’ user names (or, in fact, to even record user names) so hopefully it’s not an invasion of privacy as not even I have any idea who these people are. Interestingly, only about two-thirds of listings include postcode information, it must be optional.