well so I asked Tom if it was all right with him if I built a project 1,000-yard benchrest rifle using this action and other parts and processes I’ll mention later. I told Tom I thought it would be benefi cial to other shooters if I wrote an article about this project for this maga- zine. He was fi ne with that, so that’s what I’m doing! I plan to do some testing with this
rifl e with Krieger standard vs. gain-twist barrels, and am going to use a radical Sharpshooter Supply benchrest stock with an off-set fore-end. But fi rst let me tell you a little more
about Tom’s operation and background. Then I will talk about the rifl e’s action and the other parts that I am using on this rifl e project. Some of you may have met Tom
and his wife at the 2010 VHA Jamboree, where they had a booth set up all week at the range showing their actions and products. Tom said he has been involved
with high-accuracy machining most of his life. He previously was an instruc- tor at Indiana State University, School of Technology, and then went into the machine shop business for himself. He has been operating his own machine shop business, Production Machining Company, for more than 42 years now. His action company, Haverkamp Preci- sion, is a division of that. Tom says Production Machining
Company specializes in manufacturing high volume precision parts for medi- cal, hydraulic valve, diesel engine, and compact disc manufacturing. They have a total of 14 CNC machines including some very high-tech six-axis turning equipment. Tom says he started building rifl e
actions in 2002. But these were proto- types to experiment with, not actions for sale. He designated these prototype actions as Haverkamp Model HV50, which were large 1.500" diameter ac- tions designed for the benchrest Heavy Varmint Class (13½ lb.). These early prototypes had various mistakes and Tom was not satisfi ed with the design at fi rst. Tom said these were a learning experience, and the mistakes he made working with these prototypes helped him design an action which overcame all the early problems. One of the main problems he found with manufacturing actions was
heat-treat distortion (warpage). He found he had the best success when all openings in an action were made after heat-treating (in hardened steel) in or- der for the receiver to remain straight. This is difficult since the receiver is hardened to Rockwell C42. Through experimentation on his prototypes, Tom found he could do this properly by us- ing premium grade carbide tools and/ or EDM machining. Tom says that fac- tory actions are usually manufactured the “easy way” by machining fi rst and heat-treating last. Tom said he recently started
to make a smaller Model LV40 ac- tion for Light Varmint Class (10½ lb.) guns, which has an OD of 1.400". The Haverkamp actions are made from aircraft-quality 4140 chrome-moly steel and incorporate an additional heat- treating process. This additional heat- treating is used to normalize (stress relieve) the steel after gun drilling the hole through the receiver. Tom said they make all the parts for the action in-house except the springs and the extractor. This includes the fi ring pin assembly, trigger hanger, scope bases, and optional recoil lug. The LV40 resembles a Remington
700 with several improvements – “... a Remington on steroids” as one of Tom’s friends puts it! These improvements include: having the receiver bore honed and air-gauged for a precise bolt-to- receiver fi t, the bolt lugs are precision ground prior to lapping, a Sako-style extractor, a beefi er rear tang area for added stiffness, the receiver is machined straight and true after heat-treating, and deep machined helical fl uting of the bolt body. The LV40 does not use a recoil
lug between the action and barrel, but instead has a machined-in integral lug surface for small cartridges like BR and PPC. Haverkamp now offers an optional recoil lug that can be fi tted to the bottom of the action when using larger cartridges. You have your choice of coned or Remington-style square bolt nose, your choice of 0.062" or 0.074" fi r- ing pin tip, and three bolt face options depending on what cartridge you’re planning to use. You also have your choice of right or left port, or you can make it a dual-port like mine. The LV40 action outside diam- eter (OD) measures 1.400" which is
SABER®
EVOLUTION OF THE
THE
MODERN HUNTING RIFLE
REM700 ■ ■ ■
Short Action Long Action RH or LH
FEATURES ■ ■ Complete Modularity
Ergonomic & Adjustable
■ ■ ■
Advanced Alloys & Composites Mfg Reconfigurable
Enhances Accuracy
MADE IN USA MODULAR RIFLE CHASSIS SYSTEM
US Utilty and Design Patents #7,802,392, #D630698S1, #D629,062, #D626,618 and other patents pending.
US Utilty and Design Patents #7,802,392, #D629,062, #D626,618 and other patents pending.
-FORSST®
A Division of Ashbury International Group, Inc. PO Box 8024, Charlottesville, VA. 22906 Tel 434-296-8600 • Fax 434-296-9260
www.AshburyPrecisionOrdnance.com
www.varminthunter.org Page 7
MOD-0
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