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Posted: 5/17/2017 11:01:11 PM EDT
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My RC came with a basic priming arm (yours probably did too) and I decided to give it a try.
I'm curious if there is a trick to it. My old press had a spring loaded arm. This one seems to just flop around. It will rest against the ram and fall into the notch to prime, which is cool, but obviously you are just loading the cup one at a time and at an angle. Is that the process? Or am I missing something? Kind of like what this guy is doing but without a press that moves all over https://www.youtube.com/watch?v=oGSHG5lOvQs I know there is an upgraded option with a tube to feed and spring loaded arm. Might upgrade, but I have a separate hand tool that I usually use. |
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I'm curious about the same thing, I've used it to seat a few primers but it's not near as quick as the hand priming tool. RCBS make a primer set up for the Rockchucker but it has spotty reviews.
Honestly I plan to keep doing what I'm doing until I upgrade to a Dillon 550. I'd still like to know if people use the priming arm and how they do it. |
When I'm loading single stage, I do all my priming on my Rockchucker. You can feel the primers seat just fine. If your missing parts, call RCBS and get the parts you need. 1-800-553-5000 There should be a leaf spring in the primer arm. You can see it in the pic. I have 2 priming arms this is the small one (blue), large one is red. 
The auto prime works great when adjusted properly. I use the primer weight from one of my Dillon presses to keep the primers feeding properly. |
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Quoted:
That's a different primer arm. The one I have is the one in the linked video although hard to see. This one... https://media.midwayusa.com/productimages/880x660/Primary/214/214921.jpg |
| So after playing with this a bit more, I think the best way to use it is to leave the primer arm inside the ram and bring the ram down, add primer, lift a bit, slide case in, prime, repeat. Basically like the guy in the video is doing. Works fine for priming a handful of cases. I'd either get the spring loaded arm with feed tube or use a hand primer. I use a hand primer, but the on press arm is handy at times. |
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Here are the RCBS instructions for the Rock Chucker Supreme. See the priming instructions on page 4.
I think your process is less likely to cause dropped primers, compared to the RCBS instructions. I really like my earlier model Rock Chucker with the same priming lever as in the pictures dryflash3 posted. Between that lever and the primer feed tube, it's easy to prime 100 cases in a short time, without fumbling or messing up primers. |
Original and RCII chucker had the tube with arm system like this,
And you can spot these older presses by the slot in the upper section with allen bolt screws (even if the parts are not installed). The new supreme press does not have that top cut out slot for the older system, and uses the new type single load type primer system instead. 
As for why RCBS did away with the older tube type feed system up to the RCII presses; it does not have a blast shield around the primer drop tube to be Lawyer PC safe if some forget clean the tube to prevent a primer powder build up in the tube that could explode by even a simple static spark just loading the tube to begin with. Hence reason that RCBS when to the APS priming system to begin with from a drop tube system in the first place, and on the current Pro-5/7 presses, why it has a blast shield around the drop tube when RCBS went back to a drop tube system... So truth be told, expect at some point the supreme chucker will come with a tube drop system for priming (instead of having to hand feed each primer into the cup), but it will be a shielded drop tube system to keep up with the times. |
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I have a RCII. I used to use military brass for competition and the primer pockets were very tight. After breaking the frame on my first Lee autoprime I decided to prime on the press.
I got tired of loading the tube so I converted the tube by mounting one of the Lee primer trays onto the top of it. This worked great for years until I got the stronger RCBS hand primer. Within the last month or so I did get out the old tube/Lee tray to do some on press priming. Still works good. Motor |
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