$10.99
16 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
Setting up a full-length sizing die is one of those steps where guesswork costs you accuracy and case life. The Sinclair #28 Shoulder Bump Gage Insert takes the guessing out of it. Cut for a 28-degree shoulder angle, it fits cases like the 22-250 Remington, 223 WSSM, and 243 WSSM, and drops right into your Sinclair or Hornady comparator body so you can start measuring in seconds.
What makes these inserts different is how they reference the case. Instead of measuring to a datum line like a lot of tools do, the gage indicates off the shoulder of the case itself. That gives you a more repeatable and easier-to-read measurement of how much you're moving the shoulder back when you size. Once you've got a baseline from a fired case, you can set your die to bump the shoulder exactly where you want it and check every piece of brass against that number.
Sinclair generally recommends bumping the shoulder back .001" to .002" for bolt-action rifles and .003" to .005" for AR-15 type rifles. Nailing that window means smooth chambering without over-working the brass, which translates to more reloads per case and tighter, more consistent headspace. Pair the insert with a quality caliper and you've got a repeatable system you can trust load after load.
This isn't a one-trick tool. If you run multiple rifles chambered in the same cartridge, the gage is handy for keeping brass and loaded ammo sorted and verified. It's also a quick way to spot-check finished rounds before they go in the box. The stainless construction is built to hold its dimensions through years of bench use, and because the insert swaps in and out of your comparator body, you can build out a set covering every shoulder angle you load for.
The #28 insert is machined for a 28-degree shoulder angle and fits the 22-250 Remington, 223 WSSM, and 243 WSSM. It's designed to index off the shoulder of these specific cases, so it works best within that cartridge group rather than as a universal tool.
Yes. The insert itself is just the machined piece that reads the shoulder, so it needs to be installed in a comparator body to function. It fits both Sinclair and Hornady comparator bodies, and once seated you measure across it with your calipers.
Sinclair generally suggests .001" to .002" of bump for bolt-action rifles and .003" to .005" for AR-15 type rifles. You establish your baseline from a fired case, then adjust your sizing die until you hit that target range and verify it with the gage.
A standard datum-based comparator measures to a fixed diameter on the shoulder, while this gage indicates directly off the shoulder of the case. That approach gives a clearer, more repeatable reading of exactly how far you're moving the shoulder when you size your brass.
| UPC | 050806111196 |
|---|---|
| Manufacturer |
You must be logged in to post a review.
Reviews
There are no reviews yet.