I have & use the RCBS collet, Hornady cam lock, & Frankford Arsenal Wall Mount.
The best for minimal bullet effect is the RCBS, the Hornady is the fastest. The minimal bullet effect is the RCBS, it allows more sensitivity for collet compression. Using the Hornady it is best to position the cam, so it compresses the collet at near the lowest position. Pushing down on the cam is faster & easier than turning the bar/handle on the RCBS.
Using the Frankford Pile Driver is a real adventure -lots of heavy snap, momentum, & noise.
I recently pulled over a total of about 400 .45 Auto copper plate Berry, 185gr HBRN, Berry 230 plated RN. & 200 g Hornady XTP bullets. Bullets did not show collet marks, only minor crimp marks.
The first problem was the small screw & hex nut holding the release latch flew off after about 100 rounds. After searching the bullet room for about 15 minutes I found the hex nut using my shop magnet attached to a 4 ft long handle. I cleaned up everything & applied some blue thread locker.
The next problem was the plastic retainer intended for a 5/8 ID tube broke. I fixed that using a chunk of black vinyl lawn sprinkler tubing pressed into the hole in the Pile Driver (that held the barbed plastic 5/8 tube holder) & secured it with a wire harness & hose clamp. The ID of the vinyl tube is more than the issued 5/8 tube holder.
A 1-gallon plastic jug is used to catch the bullet & powder pulled out of the loaded round. Occasionally the entire round is dumped into the jug. Bouncing bullets & flying powder are contained. Deceleration of bullets passing thru tube should limit pointy bullet damage- if in doubt place foam on bottom of jug.
The Pile Driver is built using light weight plastic, probably to limit momentum forces. Mounting instructions need to be followed, best to use all 8 screws. A 2x6 works real good. I attached the 2X6 to my bench leg using 2 1/2 torx head deck screws.
I wear eye & ear protection. A possibly of primer detonation exists. The lightweight plastic shell holder assembly reduces momentum forces & real bad flying debris should a primer detonation occur. When tightening the 2 Phillps screws under the handle assembly use a driver extension to keep hands clear - a small piece to thin transparent tape holds the Phillip screw onto the driver - used my DeWalt cordless.
Real serious hand injury including finger amputation is possible. Don't let kids near the Pile Driver - there is no trigger to pull - the device slams down hard upon the bottom of the handle down stroke. Lots of intricate internal parts that coordinate to make the Pile Driver work.
Pulling light weight, hard crimped .224 bullets might be a challenge - little momentum. Plastic hammers break. Replacing the light weight aluminum hammer shell holder with a heavy steel press type shell holder increases the possibility of a primer detonation as impact forces are inreased.
Put a slanted blade on this thing & it would make a good guillotine for snakes.