Sunday GunDay: Browning T-Bolt in .17 HMR for Varmints
This story features a unique, American-designed rimfire rifle, chambered for the potent .17 HMR round. The current generation Browning T-Bolt has a tang-mounted ambidextrous safety, a choice of barrel contours, lengths, and finishes, and a variety of stock options. What sets the T-Bolt apart from other rimfire rifles is the way the action cycles. There is not a conventional bolt that requires four distinct motions (lift bolt handle up/pull back/move forward/rotate handle down). With the T-Bolt you simply pull the handle straight back to extract a round, then return it forward to chamber a new round from the Double Helix magazine. The cocking effort is divided between back pull and forward movement so the effort is relatively light and easy.
Among current rimfire rifles, the Browning T-Bolt ranks high for fit and finish. The bluing is very nice and the T-Bolt even boasts a gold-plated trigger shoe. Many different stock types have been offered in recent years including some very nice AA Maple stock models as shown below (click to zoom). These T-Bolt rifles exhibit very fine craftmanship. Current models are made in Japan under license to Browning.
Click image for full-screen T-Bolt photo with detail.
Browning T-Bolt Sporter AA Maple Model
RECEIVER – Steel; High polished finish; Drilled and tapped for scope mounts
BARREL – Medium Sporter; Blued finish; Free-floating; Semi-match chamber; Recessed crown
ACTION – Straight pull bolt action; Top-tang safety; Adjustable trigger
STOCK – AA Maple; Gloss finish; Checkered
FEATURES – Sling swivel studs installed
PRODUCTION – Limited quantities
T-Bolt Owner Talks about Function and Accuracy
“I have a Browning T-bolt in .17 HMR, but with the maple stock. It is probably my favorite .17 HMR rifle (also the most expensive). The rifle feels smaller than some of my other .17 HMR rifles. I think the length of pull is a little shorter. I do like the light weight and trim handling of the rifle and the straight-pull bolt can be cycled really quickly. Mine is quite accurate and will shoot one-inch groups at 100 yards with both Hornady ammo and the CCI A17 ammo.” — RexRay, Varminter.com Forum member.
Pros and Cons of the Browning T-Bolt
The T-Bolt has a reputation for good accuracy, provided you have a good lot of .17 HMR ammo (we recommend checking for bullet run-out before you shoot for groups). The straight-pull action works as advertised — it is fast, smooth, and easy-to-operate. The Double Helix magazine (covered below) is excellent. It is very compact yet ultra-reliable. Another plus is that the T-Bolt has been produced in many different versions, with a variety of stocks, and even a stainless action version.
What are the negatives? Some of the stocks have a somewhat short length-of-pull, but this is easily solved with spacers. The main complaint is the factory trigger — some owners say it is too heavy at about 4 pounds, though the break is clean. For varmint work, we could live with the stock trigger and put money saved into optics.
If you prefer a very light trigger, JARD makes a T-Bolt replacement trigger. Featuring an aluminum housing, the JARD T-Bolt trigger can be ordered with 12-, 16-, or 20-ounce pull weights. The JARD trigger offers a crisp, clean break significantly lighter than stock. But at $254.95 the JARD trigger is fairly expensive. Additionally there have been a couple complaints about slam fires at the lowest weights so we recommend the 20-ounce. Here is one owner review, from a Rimfire Central thread: “The new Browning T-Bolt is a great rifle in all aspects except for the trigger. In my case when I received my JARD trigger it was an almost drop-in installation with very little adjusting or fooling around. For me it made a decent little rifle a great little rifle.”
Browning Double Helix 10-Round Magazine
The T-Bolt’s patented 10-round rotary Double Helix™ magazine is a unique design that feeds very reliably and is easy to load. The Double Helix magazine uses a torsion drive spring and interlocking gear design to maintain correct timing and exact cartridge alignment for smooth, reliable feeding. The translucent gray body allows for easy verification of the number of remaining cartridges. We like the fact that the Double Helix provides TEN-round capacity while fitting nearly flush with the bottom of the action.
The Browning Double Helix rotary box magazine system is easy to load, easy to carry, and easy to use. The smooth, rounded exterior contours of the Double Helix, along with twin gripping grooves, tapered shape and a slightly extended baseplate design make insertion positive, while the spring-assisted drop-free magazine ejection feature allows for rapid magazine changes. T-bolt owners confirm that feeding and reliability is excellent — the magazine design puts cartridges in perfect alignment with the chamber.
Other Browning T-Bolt Variants
In recent years, Browning has produced T-Bolt rifles in a variety of models, with many different stock types and various barrel lengths/contours. Most of the photos above showcase the AA Maple Sporter T-Bolt, which is currently out of production, though still available from some dealers (if you search). We like the looks of the AA Maple T-Bolt, but there many other stock options including dark brown, Black, Green, and various camouflage finishes. Use the links below to see other T-Bolt configurations.
Current production T-Bolts are offered in four rimfire chamberings: .17 HMR, .22 LR, .22 Magnum, and .22 WMR. Barrel contours and lengths (from 2″ to 22″) vary from model to model. Shown below is the New-for-2024 T-Bolt Target SR (Suppressor Ready) and two other current models. Then we feature five notable discontinued T-Bolt rifle models. CLICK HERE to see all discontinued T-Bolt variants — many of which are still available if you search gun vendors.
Browning T-Bolt Current Models | T-Bolt Discontinued Models
.17 HMR Cartridge — Fast and Deadly on Small Varmints
We are big fans of the .17 HMR round. It’s just about perfect for ground squirrels, and is effective on prairie dogs out to about 200 yards. The three main .17 HMR producers have been CCI, Federal, and Hornady, but you will also see Browning and Remington .17 HMR ammo. Choose from 17gr or 20gr bullets — both work well in the varmint fields. A good source for all types of .17 HMR ammo is TargetSports USA.
Here is a Comparison Test of Multiple Types of .17 HMR Ammo
CCI .17 HMR TNT offers 2650 FPS Velocity
For varmint work we like CCI’s modern .17 HMR VNT ammo. This boasts class-leading 2650 FPS muzzle velocity. Engineered to combine good accuracy with high impact energy, this CCI TNT ammo features a 17gr polymer-tipped bullet designed for rapid expansion. We also like the Hornady .17 HMR Varmint Xpress ammo, rated at 2550 FPS with 17gr V-Max bullets.
