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January 15th, 2026

Great Interview with Action Maker/Rifle Builder Jim Borden and Erik Cortina

Jim borden accuracy erik cortina video interview rimrock action design engineering

Every wondered how modern rifle actions are designed and crafted? Want to know the fine details of firing pin function and bolt lock-up? Then you should definitely watch this highly informative YouTube video. Top F-Class shooter Erik Cortina of Cortina Precision interviews Jim Borden, an engineer whose Borden Accuracy company produces some of the best rifle actions ever made. This is one of the better Erik Cortina video interviews. You’ll learn quite a bit from watching the video. The full video runs over two hours, so you may want to watch in segments over a couple of days.


Jim borden accuracy erik cortina video interview rimrock action design engineering

Viewers have praised this interview, saying it has a wealth of information:

Gunsmith Alex Wheeler observed: “I consider Jim a friend even though we have never met. Definitely one of the guys that really gets actions. There’s not as many of them as you would think. He was the first timed action out there that had good ignition, at least in my opinion. It was a great interview. I do hope he has him on again.”

“Agreed. Jim is full of information and really does a good job on his actions. This [Cortina] interview with Jim Borden was excellent.” — Jud96

“I really like Jim’s explanations on why ductility is so important in an action. Especially in the critical areas that basically form 90 degree surfaces, such as where bolt lugs meet the bolt body. There is a lot of great info in this interview.” — Jackie Schmidt

“I have enjoyed all of Erik’s interview videos, which are very informative. But I agree [that] this interview with Jim Borden is the best. I learned a lot. Thank you Erik and Jim!” — Alexander-M

Jim borden accuracy erik cortina video interview rimrock action design engineering

Jim Borden James Borden Rifles Accuracy FacebookAbout Jim Borden and Borden Accuracy
Jim began shooting high power silhouette and benchrest matches in the mid 1970s while working for a Fortune 500 company as an engineer. In the early 1980s he began building rifles for himself and then for others. Jim has a background as a gunsmith, machinist, registered mechanical engineer, engineering instructor, project manager, hunter, and benchrest competitor.

In benchrest competition Jim has set ten world records and won 11 National Championships thereby earning induction into the Benchrest Hall of Fame. Jim also served six terms as President of the International Benchrest Shooters (IBS).

Jim operates Borden Rifles/Borden Accuracy with his wife Joan, sons Jim Junior and John, daughter Andrea Mecca and son-in-law John (Mike) Mecca. Jim is also an outstanding photographer. Below is a stunning eagle image photographed by Jim Borden.

Jim Borden James Borden Rifles Accuracy Facebook

Jim Borden Photography Rimrock RiflesBorden Accuracy — A Success Story
Borden Accuracy/Borden Rifles has been a source for precision benchrest and hunting rifles for many years. Jim started doing his own gunsmithing while competing in benchrest and High Power silhouette matches. Jim launched his business in 1987, working nights and weekends while still employed at P&G. The business became full-time in 1995 with Jim and his wife Joan doing the work. The business was expanded in 1999 with the construction of the new Springville, PA facility and the addition of sons Jim Jr. and John to the staff. Daughter Andrea Mecca joined the staff in May 2016 as machinist and machine operator and Son-in-law John Mecca came onboard in January 2000.

Jim and company began making Rimrock benchrest and Rimrock hunting actions in 2001. They added Borden Alpine and Timberline actions in 2006. These actions are made in an advanced manufacturing facility which has three CNC vertical machining centers, 1 CNC lathe and 2 CNC turning centers, three manual lathes, a manual knee mill, a surface grinder, a cylindrical grinder and wire EDM machine. To learn more, visit BordenRifles.com, call 570-965-2505, or send email to info [at] bordenrifles.com.

Borden Accuracy Rifles benchrest actions

Permalink - Videos, Gear Review, Gunsmithing, Tech Tip No Comments »
January 15th, 2026

Reloading — How to Set Up and Use Full-Length Sizing Dies

Sizing dies brass sinclair redding full length neck neck-sizing small base

This article is part of Sinclair Int’l Step-By-Step Reloading Series. Most of the products mentioned in this article are sold through Brownells.com.

by Roy Hill, Brownells/Sinclair Copywriter
Making your own precision handloads is a meticulous journey with many steps, many important matters to consider, and many sets of measurements to calculate. For those who pursue the perfect group, the highest score, the really long accurate shot, the rewards more than outweigh the effort. Choosing the right cases, deburring the flash holes, making the primer pockets uniform, trimming the cases, and lubricating them are all familiar – and critical – steps along the journey. And now that your brass preparation is complete, you are at last ready to start running the cases through your press and fill them with primers, powder, and bullets. The very first die the brass encounters is the sizing die. You insert the case, work the press’s lever to return the case to its correct pre-fired dimensions – and the journey continues.

Sinclair International Int'l fL full-length sizing die bump die shoulder bump gauge

There are three types of sizing dies to think about: neck, full-length, and small base. All three have specific benefits and potential drawbacks, and you should choose the type of die you use by thinking very carefully about what kind of shooting you plan to do with your handloads. No matter which type you select, most sizing dies will also punch out the old spent primer with some sort of decapper assembly that uses a hardened steel rod. Many types of sizing dies use an expander ball inside the die to make sure the neck of the case will accommodate a bullet after being sized. With some size dies, the expanders are easily removable and interchangeable, letting you get exactly the neck tension you want. When sizing cases (neck of full-length), rifle cases always need lube.

Neck-Sizing Dies
Sinclair International Int'l fL full-length neck size neck-sizing die bump die shoulder bump gaugeNeck-sizing dies resize only the neck of the case. The benefit of sizing only the neck is that the brass is “worked” very little, reducing the amount of changes to the brss. [We recommend full-length sizing for all applications after the first couple of firings, and semi-auto brass should be full-length sized every time!] Sinclair recommends that neck-sized-only cartridges should not be used any in other rifle besides the one they were originally fired from [unless they are also FL-sized], or in any action other than a bolt-action.

Full-Length Sizing Dies
Full-length sizing dies resize the full length of the case, not just the neck. Full-length sizing helps create handloads that will function in any rifle, not just the one from which the cases were originally fired. The potential downside of full-length sizing is that it may shorten case life because it works the brass more than neck sizing. But it’s possible to “tune” today’s full-length sizing dies so they barely work the brass at all, as this article by Sinclair Reloading Tech Ron Dague shows.

Illustration Shows How a Full-Length Sizing Die Works
Sinclair International Int'l fL full-length sizing die bump die shoulder bump gauge

Another way to reap the benefits of full-length sizing is to use Redding’s full-length bushing dies, which size the full length of the case but use a system of interchangeable bushings that enable you give the case neck the bare minimum of resizing needed. To see how finely adjustable bushing dies are, and how they resize the case while fully supported, CLICK HERE for Video. The neck bushing helps you precisely control the neck tension to help increase the consistency and accuracy of your handloads.

Redding Custom full length dies

Small Base Dies
A Small Base Die is another type of full-length sizing die, but one that is typically used when reloading for semi-automatic rifles, like the AR-15, M14, or AR-style .308 rifles. (It may also work well for bolt guns that need extra sizing on the lower section of the case.) A small base die works exactly like a full-length sizing die, only it compresses the brass just a bit more, usually about .001″ more, and may even push the case shoulder back just a hair. Small base dies give that extra bit of compression to the brass to help make sure the case will properly extract from a semi-automatic firearm. The upside is that you get handloads that should work flawlessly in your semi-automatic. The downside is case life may be shortened as compared to brass used only in one bolt-action rifle, because the brass is worked more.

Shoulder Bump Gauges
A handy tool for setting up your full-length sizing dies as close as possible to your rifle’s chamber is a shoulder bump gauge. The bump gauge lets you resize the case as little as possible, to extend case life and help your handloads fit your rifle almost like a neck-sized only die. You use deprimed cases fired in your rifle and bump gauge inserts to help you set up the die so it resizes the case only about .001″ to .004″, depending on what type of rifle you’re shooting.

Video shows how to use a shoulder bump gauge to set up your full-length dies

Sinclair International Int'l sizing die bump die shoulder bump gauge

Article Find by EdLongrange. We welcome reader submissions
Permalink - Videos, Bullets, Brass, Ammo, Reloading No Comments »
January 15th, 2026

Be Wise with Your Eyes — Always Use Good Eye Protection

Sherri Gallagher
Sherri Jo Gallagher, the second woman in history to win the NRA High Power National Championship, sports Eye Protection at Camp Perry. The first lady High Power Champion was Sherri’s mother, Nancy Tompkins.

In response to a Bulletin article about Protective Eyewear, one of our Canadian readers posted a personal story. His account demonstrates the importance of wearing eye protection whenever you shoot — no matter what type of firearm you are using — even air rifles. We hope all our readers take this to heart. All too often at rifle matches we see shooters, even some top competitors, risking their vision by failing to wear eye protection.

Eye and Hearing Protection are now MANDATORY for Highpower Rifle competitors and Pistol shooters in all CMP-affiliated matches. The 2020 CMP Highpower Rifle, Pistol, and CMP Games Rulebooks all contain the following rule: “All competitors and competition officials are required to wear appropriate eye and hearing protection when on shooting range firing lines during highpower rifle or pistol firing. All competitors must comply with this requirement before they can participate in a CMP sponsored or sanctioned competition. Competitors are responsible for selecting their eyewear and hearing protection.”

2020 CMP Civilian Marksmanship program rules Highpower High Power mandatory eye protection

Red Ryder BB Gun safetyEye Protection — Lesson Learned
by Nicholas from Canada
As a boy on a mixed farm on the plains the first shooting stick I owned was a Red Ryder BB gun. My Dad bought it for me as I showed a keen interest in the shooting and hunting sports. I was about 9 years old at the time.

We had literally thousands of sparrows in our large farm yard and they liked to roost on the steel railings in the barn loft. I took to slowly thinning out their ranks by flashlight at night as these little winged pests settled in the farm buildings.

One evening as I slayed sparrow after sparrow in the barn loft — with about a dozen farm cats following me to consume these easy meals, I fired at another bird centered in my flashlight beam.

However, my aim was a bit low — and the copper pellet hit the steel beam square on. Instantly I felt a sharp pain as the BB bounced back and hit me squarely between the eyes on the bridge of my nose – drawing blood from the partial penetration into the skin. A half inch either way and I’d have lost an eye!

Never, never, never shoot at any target with a steel background with any firearm, even a BB gun – is the hard lesson I learned, and wear the best shooting glasses that money can buy!

PLEASE REMEMBER THAT!!

Editor’s Comment: Among competitive pistol shooters, the use of safety eyewear is universal. You’ll never see Rob Leatham, Julie Golob, or Jerry Miculek competing without eye protection — for good reason. The handgun sports’ governing bodies effectively enforce mandatory eye protection policies. We wish the same could be said for competitive rifle shooting. We often see benchrest, High Power, and F-Class competitors shooting without eye protection. We’ve heard all the excuses, yet none of them trump the safety considerations involved.

We recommend that all shooters and hunters employ eye protection whenever they use firearms or are at a location where live fire is taking place. You only have two eyes. A tiny bullet fragment or ricochet is all it takes to cause permanent blindness in one or both eyes. As rifle shooters, we place our eyes a couple inches away from a combustion chamber operating at pressures up to 70,000 psi. I know quite a few guys who will religiously put on safety glasses when running a lathe or a drill press, yet the same guys won’t use eye protection when shooting their rifles — simply because it is “inconvenient”. That’s nuts. It doesn’t matter is you are a cub scout or a multi-time National Champion — you should wear eye protection.

I will give you a personal example. A year ago I was shooting a 9mm pistol. One of the cartridges had a primer burst outward blowing small particles, some brass, and a piece of the pistol’s extractor right back into my eyes. Thankfully I was wearing good wrap-around safety glasses. No injuries at all. But without those safety glasses, this could have been very serious. I always wear safety glasses with ALL firearms. Shown below is the same kind of primer blow-out I experienced, but with a .270 Win rifle cartridge.

primer blow-out safety glasse

Be wise — protect your eyes. To learn more about eyewear safety standards, and to learn about the latest options in ANSI Z87-certified protective eyewear, read our article on Eye Protection for Shooters.

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