Are you sure that the Henderson 17 and 20 caliber heads will work on the RCBS? If they would, why wouldn't they be offered already.What am I missing? the RCBS trimmer is built by Henderson. Use the RCBS certificate for the trimmer and buy the 17 and 20 caliber heads from Henderson for use in the RCBS trimmer.
I seem to get chatter marks (probably not detrimental to accuracy) on my brass when I tried a Forster three-way trimmer on multiple occasions. I ended up going back to the Redding case trimmer each time. I've ordered a Giraud that should show up this month. I hope Giraud is everything it's hyped to be.









