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November 5th, 2025

Handsome F-Open Rig with Stunning Wood and Borden Action

Speedy Thomas Gonzalez F-Open F-Class .284 Winchester 284 win custom rifle
Note the owner’s name, “S. Limbourne” was engraved on the bolt release (and trigger guard, see below).

Competition rifles don’t need to be beautiful, as long as they shoot. But who doesn’t like a spectacular figured-wood stock, particularly when it is combined with a superb custom action and a tack-driving barrel. This custom .284 Winchester F-Class Open division rig was crafted by gunsmith Thomas “Speedy” Gonzalez for competitive shooter Scott Limbourne. The handsome Bacote wood stock comes from Cerus Rifleworks, while the action is a polished Borden RBRP BRMXD. Two Brux 1:9″-twist barrels were chambered for the project, both finished at 32″. The stock is also fitted with a R.A.D. Recoil System. This rig has top-of-the-line hardware all around.

Speedy Thomas Gonzalez F-Open F-Class .284 Winchester 284 win custom rifle

Speedy Thomas Gonzalez F-Open F-Class .284 Winchester 284 win custom rifle

Action: Borden BRMXD – Polished
Rail: 20 MOA Polished
Chambering: .284 Winchester
Trigger: Jewell BR – Blueprinted
Barrel: (2x) Brux 32″ 1:9″ Twist
Stock: Cerus F-Open in Exhibition Grade Bacote
Recoil System: R.A.D. System
Extras: Carbon Fiber Tunnel Plate, Custom Engraving Work on Action, Trigger Guard, and Bolt Release.

Speedy Thomas Gonzalez F-Open F-Class .284 Winchester 284 win custom rifle

Speedy Thomas Gonzalez F-Open F-Class .284 Winchester 284 win custom rifle

You’ll find other impressive rigs on Speedy’s Facebook Page. If you’d like a superb custom rifle like this, call Thomas “Speedy” Gonzalez at 972-672-6630, or send email to: speedy.godzilla [at] msn.com.

SPEEDY GONZALEZ
9023 HUEBNER RD. STE 102
SAN ANTONIO, TX 78240

Permalink Gear Review, Gunsmithing No Comments »
November 5th, 2025

Small-Bore Rifles Book — Excellent Resource for Rimfire Shooters

If you are shopping for a new rimfire rifle, particularly a .22 LR, you may want to pick up a copy of Small-Bore Rifles: A Guide for Rimfire Users by C. Rodney James. This provides a detailed history of rimfire cartridges and provides a look at a variety of rimfire rifles for various applications — target, plinking, varminting. SSUSA.org explains this book covers “every aspect of rimfire shooting, from a detailed history of its calibers and platforms, to a discussion of proper maintenance and expected accuracy[.]” American Rifleman Editor-in-Chief, Mark Keefe, writes: “This little book is the most useful treatment of the [.22 Long Rifle] I have read, and it is highly recommended for anyone serious about being a rimfire rifleman.”

The 248-page book is available for $17.99 from Skyhorse Publishing in both paperback and ebook formats. You can view a 40-page sample of this book, including the index, on Amazon. CLICK HERE, then, when the page opens on Amazon.com, click the “READ SAMPLE” link below the book cover image. Amazon offers the book in Kindle format for $12.99.

This book focuses primarily on the .22 LR (Long Rifle) cartridge. However, it does include extensive information on other rimfire chamberings, including .17 PMC/Aguila, .17 HMR, and .22 WMR. Here’s part of the 22 WMR section:

Here are reviews by recent verified purchases of the book:

“Everything you could ever want to know about the development of the .22 round, the ballistics of the same and the history of early bolt-action .22 rifles are presented in an easy-read style by a very knowledgeable author. There are plenty of color photographs and a lot of useful maintenance information throughout the book. I do have one complaint… the book has almost no information on semi-automatics.” — K. Greene

“A must-read book for the rimfire enthusiast. Much accurate information presented in an enjoyable format. From the earliest rimfire rounds to the latest 17s [are] all are covered in this book. Bolt actions, semi-autos and single-shot rifles are covered with the pros and cons of each. What makes for accuracy from the rifle to the cartridge is well covered.” — Ken Cook

Permalink Bullets, Brass, Ammo, Gear Review, Shooting Skills, Tech Tip No Comments »
November 5th, 2025

Sectional Density of Bullets — What You Need to Know

Bullet projectile sectional density formula Sierra Bullets

by Sierra Bullets Ballistic Technician Paul Box
All of us who have been in reloading and shooting for any period of time have read how sectional density has been regarded as a bullet’s ability to penetrate. Back before high velocity came along and modern bullet design, the easiest way to get more “power” and penetration was by increasing the diameter and mass. After all, a bowling ball will hurt more than a golf ball, right?

Let’s take a closer look at sectional density.

The formula for calculating sectional density is pretty simple and straight forward. Take the bullet weight and divide by 7000. This number is then divided by the bullet diameter squared Two bullets of equal weight and the same diameter will have equal sectional sectional density. No regard is given to the bullet construction. This is where the fly hits the soup in considering sectional density as far as penetration is concerned.

Section Density Formula: (Bullet Weight divided by 7000) divided by Bullet Diameter squared.

Bullet construction is the biggest factor in how it is able to penetrate. The best example I can think of here is to look at the Sierra .224 55 Gr. FMJBT GameKing #1355 compared to the 55 Gr. BlitzKing #1455. Both are .224 and weigh 55 grs. Both have a sectional density of .157. But there is a huge difference in their construction. The FMJ has a thick jacket and is designed to penetrate. The BlitzKing is designed for fast and rapid expansion with little concern for how deep they will penetrate.

The next time you’re choosing a bullet, look at the construction and less at the sectional density number. It’s all about the construction anyway. If you have any questions or would like to discuss sectional density or bullet penetration further, please give us a call at 800-223-8799 or shoot us an email at sierra@sierrabullets.com.

Sierra Bullets reloading tips

Permalink Bullets, Brass, Ammo, Tech Tip No Comments »