The RCBS Rock Chucker Supreme is a legend. For decades, it’s been the gold standard single-stage press, synonymous with durability and precision. Its reputation is built on a cast-iron “O” frame that seems to last forever. But even legends have their quirks. No tool is perfect, and a vocal segment of users reports specific, recurring frustrations. These aren’t deal-breakers for most, but they’re worth knowing before you commit.
This article dives into the real-world RCBS Rock Chucker issues that populate reloading forums. We’ll separate common reloading press problems from simple setup mistakes. You’ll learn practical fixes and when it’s time to call in the pros. A little organization goes a long way in troubleshooting. For keeping primers and cases sorted during your diagnostic session, many professionals recommend using a Universal Reloading Tray. It’s a simple tool that prevents spills and keeps your workspace orderly.
Top 5 Mechanical & Functional Problems Reported
These are the physical hiccups that can interrupt a smooth reloading session. They often relate to wear, manufacturing tolerances, or the sheer force the press handles.
1. Press Linkage Stiffness & “Breaking In”
New Rock Chucker owners often ask, “why is my Rock Chucker Supreme so hard to operate?” Initial Linkage Stiffness is the most common report. The linkage pins and bushings are fitted tightly from the factory. This isn’t a defect; it’s a feature for long-term slop-free operation. The press requires a significant break-in period. A few hundred cycles with a good lubricant like Break-Free CLP on the linkage points usually transforms the action. If stiffness persists after break-in, check for misalignment or over-tightened bolts.
2. The Dreaded Stuck Case
This is a universal reloading headache, not unique to RCBS. However, the Rock Chucker’s solid frame means you’re applying tremendous force. A Stuck Case usually stems from insufficient case lube, especially with rifle brass. The best way to remove a stuck case in a Rock Chucker is with a dedicated stuck case remover kit. Forcing it with more lever pressure rarely works and can damage your die. Prevention is key: don’t skimp on lube, and ensure your cases are clean and dry.
3. Shell Holder Alignment & Runout Concerns
Precision reloaders scrutinize every variable. Some users report minor Shell Holder Alignment issues, where the shell holder doesn’t sit perfectly parallel to the die. This can contribute to bullet runout. The fix often involves checking the ram for burrs and ensuring the shell holder is properly seated and the lock ring is tight. For ultra-precision work, some turn to systems with floating toolheads, which leads to debates like Rock Chucker Supreme vs Co-Ax for precision.
4. Primer Catcher Not Working (As Advertised)
This is arguably the most frequent complaint. The plastic Primer Catcher tray has a simple design that doesn’t always work. Primers can bounce out, miss the tray entirely, or get stuck in the chute. It’s more of a “primer suggester” than a catcher. Users have crafted countless DIY solutions, from taping a plastic bottle to the frame to installing aftermarket 3D-printed catchers. It’s a functional flaw in an otherwise robust tool.
5. General Wear and Tear on High-Use Parts
After tens of thousands of cycles, the primer arm tip can deform, or the handle bolt may loosen. These aren’t problems so much as expected maintenance items. RCBS customer service is famously good about sending replacement small parts, often for free. Keeping an eye on these components is part of standard reloading press maintenance.
Priming System Issues & Workarounds
The on-press priming system is a common pain point. While convenient, its design leads to specific failures that frustrate users seeking a smooth, uninterrupted rhythm.
The Priming Arm (or shell holder platform) can be finicky. Issues include:
- Primer Feed Jams: Primers flipping sideways or not sliding into the cup correctly. This is often due to a dirty or gummy primer slide channel. A thorough cleaning with a degreaser and a light graphite powder lubrication usually solves it.
- Weak or Inconsistent Primer Seating: The spring that returns the arm can weaken, or the arm itself can develop slop. This leads to high primers or crushed primers. How to fix RCBS Rock Chucker primer arm issues often involves checking this spring and the pivot pin for wear.
- The entire unit can feel less positive than bench-mounted primer tools. Many experienced reloaders eventually bypass it for a dedicated hand primer for better feel and consistency.
User Error vs. Manufacturing Defect: Common Setup Mistakes
Not every problem is the press’s fault. Many single stage press problems are self-inflicted. Let’s clear the air on common setup errors.
- Improper Bolting Down: The press must be securely mounted to a solid bench. Any flex in the bench translates to lost energy and a “mushy” feel. Use large washers or a mounting plate.
- Over-tightening Lock Rings: Cranking down the die lock ring with excessive force can distort the die and misalign it. Snug is sufficient.
- Misunderstanding the “Cam-Over” Design: The Rock Chucker is designed to cam over slightly at the bottom of the stroke for consistent sizing. New users sometimes mistake this for a problem or try to adjust it out, which hurts consistency.
- Using Wrong or No Lubricant: As mentioned, this is the primary cause of stuck cases. It’s not the press; it’s the process.
For a deeper look at the press’s capabilities straight from the bench, our in-depth RCBS review covers setup and performance in detail.
Rock Chucker Supreme Troubleshooting Guide & When to Contact RCBS
Heres a quick-action table for common issues. Try these RCBS press fixes before you get frustrated.
| Problem | Likely Cause | Immediate Action |
|---|---|---|
| Hard to operate, stiff lever | New press stiffness, dry linkage | Lubricate all pivot points with gun oil or CLP. Cycle the press 100+ times. |
| Primer catcher not catching | Design limitation, misaligned chute | Accept its imperfection. Craft a DIY extension from a plastic bottle or order an aftermarket solution. |
| Primers crushing or not seating | Dirty primer slide, weak return spring, misaligned arm | Disassemble and clean the primer system. Lubricate with graphite. Check spring tension. |
| Case stuck in die | Insufficient or improper case lube | Use a dedicated stuck case remover. Do NOT force the lever. |
| Loose handle or wobble | Handle bolt loosened from use | Tighten the large bolt at the base of the handle. Check for wear on the bolt or bushing. |
When to Contact RCBS Customer Service: If you’ve ruled out user error and a part is genuinely broken, worn, or out of spec, call them. This includes a cracked frame (extremely rare), a severely bent linkage rod, or a malformed priming arm. Have your press’s serial number ready. They have a stellar reputation for supporting their products, often shipping small replacement parts at no charge. It’s one of the biggest value-adds of buying an RCBS press.
Long-Term Reliability & Is It Still the Best Single Stage?
So, after all these potential issues, does the Rock Chucker Supreme still deserve its throne? For most reloaders, absolutely. The reported problems are generally nuisances, not catastrophic failures. The mechanical linkage stiffness breaks in. The primer catcher can be modified. The priming system can be mastered or supplemented.
Its core strengththe massive, rigid frameremains unchallenged in its price range. It provides a consistency foundation that cheaper presses can’t match. While competitors like the Frankford Arsenal M-Press or the Lee Classic Cast offer compelling features, the Rock Chucker’s decades of proven service and unmatched customer support tilt the scales.
It may not be perfect. But it’s a tool you buy once. You learn its quirks, perform simple maintenance, and it will likely outlast you. For the reloader who values solidity over flashy features and wants a press that becomes a trusted, permanent part of the bench, the Rock Chucker Supreme’s problems are minor speed bumps on a very long, reliable road.