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November 29th, 2023

Reloading Tip — With New Brass, Use Expander Mandrels

Expander Mandrel reloading case neck tension cartridge brass

Before you load that new cartridge brass for the first time, run an expander mandrel down the case necks. This will iron out dents and provide more uniform neck tension. Chose a mandrel diameter that provides appropriate neck tension.

Lapua brass is so good that you’ll be tempted to just load and shoot, if you have a “no-turn” chamber. However, some minimal case prep will ensure more uniform neck tension. Keeping your neck tension very uniform allows more consistent bullet seating. That, in turn, usually yields better accuracy, and lower Extreme Spread and Standard Deviation (ES/SD). Lapua brass, particularly 6mmBR, 6.5×47, 6.5 Creedmoor, and .308 Win comes from the factory with tighter-than-optimal necks. Before you seat bullets, at a minimum, you should inside chamfer the case mouths, after running an expander mandrel down the necks. The expander mandrels from both Sinclair Int’l (Brownells) and K&M will both leave the necks with enough neck tension (more than .001″) so you can then seat bullets without another operation. We suggest putting a bit of lube on the mandrel before running it down the necks — but remove any lube that gets inside the necks before seating bullets.

Sinclair Expander Tool Mandrel

Both Sinclair and K&\M Tools make a die body specifically to hold expander mandrels. The Sinclair version, is shown above. This $37.99 unit fits caliber-specific expander mandrels which measure approximately .001″ less than bullet diameter for each caliber. This is an updated “Gen II” design that completely captures the mandrel within the die so the mandrel cannot pull out. It also has an O-ring in the die cap that allows the mandrel to self-center within the case neck. Sinclair now offers three sizes of die bodies for expander mandrels: .17 -.338 Caliber (#749-011-715WS, $53.99); .357 – .50 caliber (#749-008-843WS, $37.99), and a special .50 Cal die body for large-diameter 50 BMG presses (#749-009-163WS, $51.99). All Generation II dies are machined from stainless steel and the standard diameter 7/8-14 dies include the Sinclair Stainless Steel Split Lock Ring.

Once you run the Sinclair expander mandrel down the necks of Lapua brass, after you account for brass spring-back, you’ll have about .002″ neck tension*. This will make the process of seating bullets go much more smoothly, and you will also iron out any dents in the case mouths. Once the case mouths are all expanded, and uniformly round, then do your inside neck chamfering/deburring. The same expander mandrels can be used to “neck-up” smaller diameter brass, or prepare brass for neck-turning.

Forum member Mike Crawford adds: “These expanders can also reduce runout from offset seating. Prior to bullet seating, expand the sized necks to force thickness variance outward. With the Sinclair system, the necks will springback fine, and will not be pulled out of center. This leaves plenty of tension, and bullets seated more centered. I do this, even with turned necks, to get improved seating.”

Mandrels vs. Expander Balls on Decapping Rods
If you haven’t acquired an appropriate expander mandrel for your brass, but you DO have a full-length sizing die with an expander ball, this will also function to “iron out” the necks and reduce tension. However, using a die with an expander ball will work the necks more — since you first size them down, then the ball expands them up again. Typically (but not always), run-out is worse when using an expander ball vs. an expander mandrel.


* This .002″ tension is what we have observed with Lapua 6mmBR, 6.5×47, 6.5 Creedmoor, and .308 Win brass. This might vary with much smaller or larger cases, and of course a different brand of brass might yield different results. If you get too little tension with your current mandrel, you can get a smaller-diameter mandrel from 21st Century Innovation, with stainless, Black Nitride, or Titanium nitride versions. The Nitride models have less friction.

Permalink Bullets, Brass, Ammo, Gear Review, Reloading No Comments »
November 29th, 2023

Hornady NRL Hunter Challenge Featured on Shooting USA TV

NRL Hornady Precision Hunter Challenge price utah north springs shooting complex

The NRL Precision Hunter Challenge features a multi-distance, walk-around shooting course similar in some ways to PRS/NRL, but limitations on weight and cost of equipment make this more affordable and more practical. This relatively new discipline is catching on — the 2023 NRL Hunter Challenge match, held June 16-18, 2023, in Price, Utah, drew nearly 150 competitors. Hornady was the title sponsor of the event.

Shooting USA SHOW TIMES:
The 2023 Hornady NRL Hunter Challenge is featured this week on Shooting USA television. This Shooting USA Episode airs Wednesday, November 29, 2023 at 9:00 PM Eastern and Pacific; 8:00 PM Central. If you miss the regular broadcast, you can stream the show online on Vimeo for $0.99 per episode.

Shooters from all over the country competed in 20 challenging stages. The course of fire consisted of 160 rounds with hiking between stages at the North Springs Shooting Complex. The Precision Hunter Challenge featured target distances from 200-850 yards, and angled shots between 0-10°. At the North Springs Shooting Complex, there were natural terrain obstacles and tree stands. Competitors had to navigate the terrain to establish their shooting positions — very much the opposite of a benchrest match!

NRL Hornady Precision Hunter Challenge price utah north springs shooting complex

“The NRL HUNTER Series is designed to help educate new and seasoned hunters about their skills, gear, and personal limitations. The Hornady Precision Hunter Challenge did just that!” said Travis Ishida, President of the NRL. “With a well-designed course of fire that was both challenging and fun, this match encompassed everything we are looking for. With over 50% new faces at this match the NRL HUNTER Series is growing faster than we ever imagined” he added. Verl Dallin, Match Director, added: “With the help of the staff and ROs, the Hornady Precision Hunter Match turned out simply fantastic”.

This video features highlights from the 2022 Hornady Precision Hunter Challenge:

Permalink - Videos, Competition, Hunting/Varminting No Comments »