Is the RCBS Junior II Better Than the Partner Press?
By Amis Thains Updated 6 min read
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On this page (7 sections)
You are deciding between the RCBS Junior II and a Lee Partner press, wondering if the Junior is actually worth the upgrade over the Lee. This page compares their frames, linkages, and usability so you can pick the right tool for your handloading setup.
In short: The RCBS Junior II is not inherently "better" than the Partner press; it is built differently for a specific workflow.
The Junior II is a single-stage press designed for precision work without the bulk of a Rock Chucker, while the Partner (Lee O-Lee) is an open-frame press optimized for speed and easy access.
Your choice depends on whether you prioritize maximum case support for accuracy or a lighter, more open design for volume reloading.
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Adds fine adjustment for the Junior II where consistency matters most.
Makes the Partner press primer catch easier to manage and cleaner.
What the Junior II and Partner Press Actually Are
The RCBS Junior II is a single-stage reloading press with a cast-steel frame. It is smaller and lighter than the Rock Chucker but uses a similar high-quality manufacturing standard. It features a closed O-frame design that holds the case neck firmly during the press stroke. There is more on setting up rock chucker priming arm in a separate guide.
The “Partner” press usually refers to the Lee O-Lee or Lee Reloading Partner. This is a cast-iron press with an open-front frame. The open design lets you see the die and case directly, making it easier to spot issues. It is a workhorse designed for reliability and value.
Understanding the name “Partner” is important because Lee has used this term for several models over the years, including the O-Lee and the Classic Cast. The defining feature across all of them is the open-front construction.
This contrasts sharply with the RCBS Junior II, which keeps the case encased within the frame’s walls. This structural difference drives almost all the other functional distinctions we will look at below.
The Junior II is the specific premium option being compared in the search.
- A solid press built for sizing, seating, and full‑length work.
- UNIQUE UP‑STROKE DESIGN: The case stays put while the die moves down, giving you a
Frame Design and Case Support Explained
The biggest difference is the frame. The Junior II uses a closed O-frame. This surrounds the case, providing high rigidity. When you size or prime, the frame prevents the case from moving. This is critical for accuracy, especially with rimless rifle cartridges where the extractor groove is tight.
The Lee Partner uses an open-front frame. The case is held by the base and the die, not a full surrounding wall. This is great for pistol calibers and straight-walled rounds where you need to see what you are doing. It allows for faster visual checks of your work but offers less structural support for fragile case necks.
- Junior II: Closed frame, maximum support, better for precision rifles.
- Partner: Open frame, visual access, better for volume and pistols.
For rifle shooters, the closed frame of the Junior II prevents the case neck from bending or shifting during the seating stroke. This consistency is why many precision shooters prefer RCBS tools. It helps to understand measuring press footprint before going further.
For pistol reloaders, the open frame of the Partner press lets you insert or remove the case without removing the die, speeding up your workflow significantly. It is a trade-off between structural perfection and operational speed.
Linkage Smoothness and User Experience
Both presses use a compound linkage system to give you mechanical advantage. The Junior II is known for a very smooth, precise feel. The linkage is tuned for light strokes, which helps when you are working on small primer pockets or delicate neck sizing.
The Partner press has a stiffer, more robust feel. It takes a bit more effort to push the handle through the full stroke. Some shooters like this “heft” because it feels solid. Others find it tiring during long sessions. The Junior II feels more refined; the Partner feels like a farm tool.
If you are loading 300 rounds at a time, the difference in fatigue is noticeable. The Junior II’s lighter stroke can make a long session more comfortable. Additionally, the Junior II often comes with a more polished handle and smoother pivot points.
The Partner press prioritizes ruggedness over refinement, so the surfaces may feel rougher. If you have arthritis or joint issues, the lighter action of the Junior II is a major physical benefit that cannot be ignored.
Priming and Case Prep Workflows
Priming is where the difference in design really shows. The Junior II has a dedicated primer chute that collects spent primers. You have to empty it manually, but it keeps them off the bench. If that sounds like your bench, read up on partner vs rcbs next.
The Partner press often relies on a primer catcher cup or a third-party modification. The open frame makes it easy to install a primer catcher, but it is not always as integrated as the RCBS system. If you are sensitive to primer spillage, the Junior II’s built-in system is more contained.
For case prep, the Junior II is better at neck sizing because the closed frame supports the neck. The Partner is better for bulk body sizing of pistol cases because you can load multiple at a time more easily.
When using the Partner press for neck sizing, you must be careful not to over-size the case body, as the open frame provides less resistance to side-to-side movement. The Junior II’s walls physically block this movement, making it more forgiving for less experienced shooters.
Safety first: Never leave spent primers on the bench. They are a tripping hazard and can be misfired if dropped. Empty your catcher regularly.
A dedicated catcher upgrades the Partner press to rival the Junior II's containment.
- A better way to catch spent primers
- Easy to install or remove
When to Choose the Junior II Over the Partner
Get the RCBS Junior II if you prioritize precision rifle work. If you load .223, .308, or 6.5mm and care about consistent neck dimensions, the closed frame is worth the premium. It is also the better choice if you want a tool that feels “finished” and refined.
Get the Lee Partner if you are on a budget or load high volumes of pistol ammunition. The open frame is faster for seeing your work, and the lower cost frees up money for quality dies and powder. It is the smarter choice for a starter bench. We cover priming cases without a dedicated station in a guide of its own.
Consider the secondary market as well. The Junior II holds its value better than the Partner press. If you plan to sell your gear in the future, the RCBS brand has a stronger resale reputation.
The Lee Partner is a consumable item for many; you buy it, use it for years, and replace it when it wears out. The Junior II is an investment piece that can last a lifetime.
Factor this into your decision if longevity of the tool itself is a priority.
A micrometer seater pairs well with the Junior II's precision focus.
- Experience precise micro-adjustments to the seater depth of the bullet with a built-in
- Holds bullet in place while seating and has an adjustable seating depth
The bottom line
The RCBS Junior II is better for precision and comfort; the Partner press is better for value and open-frame access. If your budget allows and you shoot rifle, get the Junior II. If you are loading pistols or want to save money, the Partner is the smarter buy. Start with the press that matches your main cartridge type.
- Experience precise micro-adjustments to the seater depth of the bullet with a built-in
- Holds bullet in place while seating and has an adjustable seating depth
Frequently asked questions
Is the RCBS Junior II the same as the Rock Chucker?
No. The Junior II is a smaller, lighter single-stage press with a different frame and linkage design. The Rock Chucker is the larger, heavier standard RCBS press. The Junior II is often used for workbench reloading where space is limited.
Can I use Rock Chucker dies in a Junior II press?
Yes, generally. Both are RCBS presses and use the same 7/16-14 die thread standard. You will need a die shell or holder that fits the Junior II’s body, but the dies themselves are compatible.
Why is the Partner press called the "Lee O-Lee"?
The Lee O-Lee is a specific model of open-frame cast-iron press. “Partner” is often used colloquially for this type of open-frame Lee press. The terminology varies, but the design is the same: open front, cast iron, no closed frame.
Which press is easier to move around the bench?
The Partner press is often easier to move because it is lighter and has a base that does not require as much clamping for smaller operations. The Junior II is heavier and more rigid, so it is usually clamped down more firmly and moved less often.