RCBS UPM Micrometer Adustment Screw

Ninth and Plum · May 22, 2009, 01:50 AM

Well I finally bought a micrometer adjustment screw for my uniflow powder measure but am wondering if I got the wrong one. I ordered the small one and can't seem to get it to work correctly. The directions that it comes with were not very helpful and after messing around with it for a while decided to post the question here. Do both the small and the large work for all uniflow powder measures? The head of the standard screw it came with was alot larger than the one I ordered. If anyone can tell me what I am doing wrong and how to correct the problem that would be great or at least let me know if I need to send the one back and get the large one, thanks for any help you can give me.

Randy 1911 · May 22, 2009, 04:13 AM

The micrometers are rotor specific. You need a large rotor for the large micrometer and a small one for the small screw. If you have the small micrometer call RCBS and ask for small rotor. They sent me one for free.The small one is for pistol and the large one is for rifle.

The way it works is you set the measure to the powder charge you want. Then record the number. When you want to go back to charge, just dial in the number. It may not be exact, but it be very close.

F. Guffey · May 22, 2009, 09:20 AM

and if the standard adjuster for the uniflow had threads and the reloader had a dial cliper or depth gage the settings would be repeatable if the reloader recorded the powder and length of the adjuster (in thousands) from the drum.

F. Guffey

May 22, 2009, 01:50 AM	#1
Ninth and Plum Member Join Date: July 14, 2008 Posts: 25	RCBS UPM Micrometer Adustment Screw Well I finally bought a micrometer adjustment screw for my uniflow powder measure but am wondering if I got the wrong one. I ordered the small one and can't seem to get it to work correctly. The directions that it comes with were not very helpful and after messing around with it for a while decided to post the question here. Do both the small and the large work for all uniflow powder measures? The head of the standard screw it came with was alot larger than the one I ordered. If anyone can tell me what I am doing wrong and how to correct the problem that would be great or at least let me know if I need to send the one back and get the large one, thanks for any help you can give me.

May 22, 2009, 04:13 AM	#2
Randy 1911 Senior Member Join Date: May 7, 2009 Location: Western Arkansas Posts: 273	The micrometers are rotor specific. You need a large rotor for the large micrometer and a small one for the small screw. If you have the small micrometer call RCBS and ask for small rotor. They sent me one for free.The small one is for pistol and the large one is for rifle. The way it works is you set the measure to the powder charge you want. Then record the number. When you want to go back to charge, just dial in the number. It may not be exact, but it be very close. __________________ Been Reloading 27 Years NRA Member Member Old Fort Gun Club www.ofgc.org

May 22, 2009, 09:20 AM	#3
F. Guffey Senior Member Join Date: July 18, 2008 Posts: 7,249	and if the standard adjuster for the uniflow had threads and the reloader had a dial cliper or depth gage the settings would be repeatable if the reloader recorded the powder and length of the adjuster (in thousands) from the drum. F. Guffey