Sunday GunDay: Water-Cooled Wondergun Set World Record

We like “outside of the box” thinking. And in the world of competitive shooting, it can’t get more unconventional than this. But this radical liquid-cooled benchrest rig wasn’t just a crazy experiment — it actually delivered the goods. This IBS Heavy Gun, built by Joel Pendergraft, produced a superb 10-shot, 3.044″ group that stood as an International Benchrest Shooters (IBS) 1000-Yard Heavy Gun record for seven years, not being broken until 2016.*

Using this water-cooled wondergun, Joel shot the record-breaking group in April 2009 at Hawks Ridge, NC. This monster features a .30-Caliber 12-twist, 4-groove Krieger barrel inside a water-filled sleeve (like on a liquid-cooled machine gun). Joel shot BIB 187gr flat-based bullets in Norma brass, pushed by a “generous amount” of Alliant Reloder 25 and Federal 210M primers. The cartridge was a big custom wildcat Joel listed as “.300 Ackley Improved”. That traditionally has been based on the .300 H&H Magnum parent case**. READ Forum Thread on .300 Ackley.

This 3.044″ 10-shot group was a remarkable accomplishment, breaking one of the longest-standing, 1000-yard IBS World Records. And Joel’s 3.044″ record stood for 10 years.

This 3.048″ 10-shot group was a remarkable accomplishment, breaking one of the longest standing 1000-yard World Records. Bill Shehane commented: “This tops the NBRSA, IBS, and Original Williamsport Clubs’ all-time 10-shot Heavy Gun group records. Took a long time to do it and I for one know Joel did not back into it — he worked harder than most… to break this record. And just like John Voneida of the Original Williamsport Club who held this most prestigous record for so long, Joel is a super nice guy and a great competitor.”

Pendergraft was modest after his notable achievement: “What makes this so very special is to be able to celebrate the accomplishment with all of my shooting friends[.] A good friend once said that records are shot when preparation and opportunity meet. I feel blessed to have personally had the opportunity. The preparation we can individually work on and achieve but the opportunity only comes to a few. Those of you that compete in long range competition will know what I mean.”

*On July 24, 2016, Michael Gaizauskas shot a 2.871″ ten-shot group that bettered Pendergraft’s record by 0.171″ (less than a quarter inch). Michael’s group was also all in the 10 ring, for a perfect 100 score. CLICK HERE for IBS Long-Range Records.

** Back in 2008, the .300 Ackley was the #1 Cartridge in 1000-yard competition at Hawks Ridge. SEE Results Chart. Forum member Cheechako explains: “The .300 Ackley Magnum is actually the .300 H&H case improved. Many shooters will start with the Weatherby brass because it is higher quality. There are several versions of the Ackley but the differences are minor until you get into the few, like the 300 Hart, that actually do increase the capacity. There is also a .300 Weatherby Improved which is sort of a misnomer because it’s almost impossible to improve that case except to eliminate the rounded corners.”

Similar Posts:

• Water-Cooled Heavy Gun Set 1000-Yard World Record
• Water-Cooled Wondergun Set 1000-Yard IBS Record
• Joel Pendergraft Sets New IBS 1000-Yard Heavy Gun World Record
• Greatest Hits: Record-Setting Liquid-Cooled Heavy Gun
• Insane Railgun Accuracy — Lozano Sets Two World Records

Tags: .300 H&H, 1000-Yard Record, 300 Ackley, 300 WSM, IBS Heavy Gun, Machine Gun Barrel, Pendergraft, Water-cooled Barrel