Findings:

• Target Rifle Shooting
• Fullbore Rifle Shooting
• Smallbore Rifle Shooting
• .22 Target Shooting: A Kit List
• Target Shooting Message Numbers
• RSA Secret Key Challenge
• challenge
• Pepsi Challenge
• Challenge of the Future
• Real World Road Rules Challenge
• Challenge a stupid patent
• The Saltine Challenge
• 13 challenges for the 13th generation
• Nodeshell Challenge
• University Challenge
• Agnosticism is the greatest intellectual challenge
• Christian challenge
• The Cheap Beer Challenge
• Scrapheap Challenge
• Minerva challenges Arachne
• BT Global Challenge
• Front Page Challenge
• Simon Singh's Code Book Cipher Challenge Cracked
• The challenge we face
• Reading Between the Lines: Lessons from the SDMI Challenge
• 24 challenge
• Daz Doorstep Challenge
• voluntary challenges in Nethack and Slash'Em
• The Great E2 Fin de Siecle Fiction Challenge
• European Soccer Challenge
• The 2-sentence Fin de Siecle Fiction Challenge Entry
• Learning Machine Challenge
• The 1-sentence Fin de Siecle Fiction Challenge Entry
• Fiction challenge results
• Challenge of Nexar
• Triangle Challenge
• Triangle Challenge Solution
• The Long Island Challenge
• Fed Challenge
• ECCp-109 Challenge
• Challenge Coin
• Chip's Challenge
• Ferrari F355 Challenge
• American Solar Challenge
• Freedom's Challenge
• James Randi Paranormal Challenge
• Three Peaks Challenge
• BOC challenge
• Challenge for Change
• Full Metal Challenge
• Cheesily Cheerful Chart Challenge
• The Lyme Park Downhill Challenge
• Most Extreme Elimination Challenge
• E2verse Valentines Challenge (collaboration)
• challenge response
• F1 Career Challenge
• Secret Me-Meta-Node Challenge
• The 99p Challenge
• DARPA grand challenge
• Challenge everything
• E2verse previous challenge (collaboration)
• Ivan's challenge
• Three Pint Challenge
• The Mentos Challenge
• wertperch's nodeshell challenge (document)
• Puzzle Quest: Challenge of the Warlords
• The Stephen King Challenge
• Harry Potter Interactive DVD Game: Hogwarts Challenge
• Millennium Challenge 2002
• THE IRON NODER CHALLENGE
• The Notebook Challenge
• Clomid challenge
• THE IRON NODER CHALLENGE 2: ELECTRIC BOOGALOO
• The Nuzlocke challenge
• THE IRON NODER CHALLENGE 3: THIS TIME IT'S MARTENSITIC
• Secret Santa Summer Nodeshell Challenge 2011
• "So?" is a challenge
• THE IRON NODER CHALLENGE 4: FERRASSIC PARK
• The challenge of writing a meaningful free-form poem using only two letter words
• THE IRON NODER CHALLENGE 5: THE FERROUS FRONTIER
• Sahara's Math Challenge # 1
• Noah's Ark challenge
• a partner who challenges you
• THE IRON NODER CHALLENGE 6: RUST NEVER SLEEPS
• The 2013 IRON NODER CHALLENGE (document)
• THE IRON NODER CHALLENGE 7: NODE HARDER WITH A VENGEANCE
• Up for a challenge?
• THE IRON NODER CHALLENGE 8: RUST IS FOR THE WEAK
• THE IRON NODER CHALLENGE: 9 FAST 9 FERROUS
• October Skeleton Challenge
• Ice bucket challenge
• THE IRON NODER CHALLENGE XII: WE'LL RUST WHEN WE'RE DEAD
• even if you fall from an impossible challenge,
• where you see mysteries, i see challenges
• "Age by age" reading challenge
• A Challenge is Issued
• Congratulations, you are about to experience a profound challenge
• A coder stumbles upon a dormant online game where real-world prizes are won; as they play, the challenges escalate to dangerous real-life tasks
• hunting rifle
• This is my rifle
• National Rifle Association
• rifle
• M41A Pulse Rifle
• sniper rifle
• M40A1 sniper rifle
• assault rifle
• Battle rifle
• Minie rifle
• My Rifle
• Ned Rifle
• Shock Rifle
• make a rifle
• Crossed Rifles
• The Rifle Song
• Gauss rifle
• air rifle
• M-14
• L-98 Cadet GP Rifle
• Browning Automatic Rifle
• Rifle Range
• ASMD Shock Rifle
• varmint rifle
• Squirrel Rifle Shoot
• The Bolt-Action Magazine Rifle
• Anti-Tank Rifle Type 97
• Rifle Christianity
• Hong Kong Sword Rifle
• Ross Rifle
• Short barreled rifle
• Artists' Rifles
• The Delicate Art of the Rifle
• rifle grenade
• Breaking in a new rifle barrel
• Armalite Rifle
• Tanegashima gun
• Killing a polar bear without a rifle
• Baker Rifle
• Spencer rifle
• Doris and George having lunch at Target
• 20mm sniper rifle
• The Royal Rifle Volunteers
• L98A1 Cadet GP Rifle
• Alternative rifle cocking methods
• As always, the rifles have the last word
• Rifle marriage (in a bar last night)
• Lee-Metford rifle
• Express rifle
• Snider rifle
• Snider-Enfield Rifle
• King's Royal Rifle Corps
• Scout Rifle
• All I got is my rifle and some stimpacks.
• The first assault rifle
• Lee Rifle
• Lee Navy Rifle
• Anti-materiel rifle
• The London and Middlesex Rifle Association Clubhouse
• Rifles (category)
• MAS 36 rifle
• The Rifle from the Tower
• Ruger American Rifles
• Kent State shooting
• Columbine Shootings
• shooting
• shooting the boot
• school shootings
• shooting iron
• shooting blanks
• Skeet shooting
• lag shooting
• shooting lightning bolts from my fingers
• Shooting guard
• Shooting up Vicodin
• drive-by shooting

If you Log in you could create a "Target Rifle Shooting: What's the challenge?" node. If you don't already have an account, you can register here.