Why reload for a Glock

The Glock platform shoots more rounds through more pistols than almost anything else on earth. If you carry, compete, or train regularly with a G17, G19, G43X, or any other 9mm Glock, ammunition costs pile up fast. Reloading typically cuts practice-ammo cost by 40–60%, and once you’re dialed in, your reloads will often shoot tighter groups than bulk factory ball.

The other reason is simple availability. Every few years the ammunition market gets tight — 9mm and .40 S&W are frequently first to disappear from shelves. Reloaders keep shooting through those cycles.

The polygonal rifling issue

The safe rule for any factory Glock barrel:

• Jacketed bullets (full metal jacket, jacketed hollow point) — always OK.
• Plated bullets (Berry’s, Rainier, X-Treme) — OK as long as you keep velocity moderate. Plated bullets are essentially soft lead with a thin copper skin; drive them too hard and the plating tears off.
• Coated bullets (polymer-coated cast, Bayou Bullets, Blue Bullets) — widely disputed. Many Glock owners shoot them without issue. Glock does not officially approve them. If you shoot coated bullets through a factory barrel, monitor for leading after every session and clean thoroughly.
• Bare cast lead — NEVER through a factory barrel. Install an aftermarket conventionally-rifled barrel first.

Choosing the right bullet

Common bullet weights by caliber

• 9mm Luger — 115gr (standard practice), 124gr (best all-around), 147gr (subsonic, for suppressor use or heavy grain preference)
• .40 S&W — 165gr, 180gr (most common)
• .45 ACP — 200gr, 230gr (standard)
• 10mm Auto — 155gr (moderate), 180gr (standard), 200gr (hunting)
• .380 ACP (G42) — 95gr
• .357 SIG — 125gr

The Gen 3 .40 kaboom question

You’ll see “Glock kaboom” in reloading forums and it deserves a straight answer. Certain older Glock chambers in .40 S&W (particularly Gen 2 and early Gen 3 G22 and G23) had less case-head support than some other pistols. Combined with high-pressure loads or previously-fired brass that had bulged in another pistol, this could — rarely — lead to a case rupture.

Modern Glocks have fully-supported chambers. If you’re reloading for a Gen 4, Gen 5, or Gen 6 Glock, this is a non-issue. If you’re reloading for a Gen 3 .40 caliber Glock, follow three rules:

• Use only new or once-fired brass from a Glock (not “range brass” that may have been fired in a competitor pistol).
• Stay at or below published mid-range load data. Don’t chase maximum velocity.
• Consider an aftermarket barrel with a tighter, more supportive chamber (Storm Lake and KKM are the two most popular options).

Components you need

Powder

For 9mm and .40 S&W, the popular choices are Hodgdon HP-38 / Winchester 231 (same powder, different label — well-behaved, easy to meter), Hodgdon CFE Pistol (specifically designed for pistol reloading with reduced copper fouling), and Alliant Power Pistol (a bit hotter, great for defensive-velocity loads).

For 10mm and .357 SIG, you’ll want slower-burning powders — Alliant Blue Dot, Accurate No. 9, or Hodgdon Longshot.

Primers

Small pistol primers for 9mm, .40 S&W, .380, and .357 SIG. Large pistol primers for .45 ACP and 10mm. Any name-brand primer works — CCI, Winchester, Federal, Remington. Small pistol Magnum primers are recommended for full-power 10mm loads.

Brass

New brass is easiest to start with (Starline is the industry standard). Once-fired brass works fine once you inspect it. Avoid range pickup brass that shows any bulge or unusual case head deformation — that’s the classic Glock “smiley face” and should be tossed.

Bullets

See the table above. Match to your intended barrel.

Starting load recommendations by caliber

These are starting loads pulled from Hodgdon’s published data. Work up 0.1gr at a time and watch for pressure signs (flat primers, ejector marks). Do not exceed maximum loads. When in doubt, consult a current reloading manual.

Aftermarket barrels and why they matter

An aftermarket, conventionally-rifled barrel is the single most useful upgrade for a serious Glock reloader. Two reasons:

• You can shoot cast lead reloads safely. Cast lead through a conventional-rifling barrel is a normal, well-understood proposition — no different than shooting cast through a 1911.
• Tighter chamber, better brass life. Match-grade aftermarket chambers are cut tighter than Glock’s factory chambers, which means your brass doesn’t stretch as much on each firing. Some reloaders get 10+ reloads per case with an aftermarket barrel versus 4–5 with the factory barrel.

Popular options:

• Storm Lake — the value pick. Match-grade at a fair price.
• KKM Precision — the shooter’s pick. Tighter tolerances, better accuracy.
• Lone Wolf — the budget pick. Solid quality at the lowest price point.

Five mistakes we see all the time

1. Skipping the case gauge check

Reload a batch, drop each round in a case gauge (a $15 tool that pays for itself the first time it catches an out-of-spec round). If it doesn’t sit flush, don’t shoot it. Glocks are picky about overall length and case dimensions.

2. Trusting range-pickup .40 brass

See above. If you carry a .40 Glock, stick with your own once-fired brass.

3. Loading too long

Glock chambers are tight and their generous throats can hide overall-length issues. Always chamber-check finished rounds.

4. Skipping powder-charge verification

Every 10th round on a progressive press, pull the case off the shell plate and drop the charge onto a scale. Overcharged rounds are the most common cause of Glock reloading incidents.

5. Assuming coated bullets = safe

Coated cast bullets are marketed as safe in polygonal barrels. That may be true for your barrel, but Glock hasn’t officially blessed it. If you go this route, clean and inspect for leading after every session.