I have posted this info before so some of this may not apply to you. I just copied and paste, getting lazy I guess.
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Here is what you do.
You'll want to polish the powder funnel internal and external and the mouth of the powder drop were the powder funnel comes in contact. Any place were the powder will make contact to the measure, then lube with grafite. This will cut back "bridgeing" of the powder or any sticking to the. I used a Dremel tool with a narrow pointed cloth polishing attachment and chrome polish
Lube all moveing parts of the powder measure with dry grafite.
Use the old fashion return spring or two, this will make the powder bar slap back the same way every time and settle the powder the same every time.
Keep the powder hopper over 1/2 full at all times
Use a anti staic spray or a dryer sheet to get rid of static charges on the powder measure
Make sure everything is adjusted correctly. Full extension of the powder bar every cycle is vital.
Adjust the safety return bar so that there is some tension on the spring when the handle is all the way down.
DON"T load lubed cases, the lube gets on the powder funnel causeing problems. I do 500 at a time useing the inturupted method, first time through the press the lubed cases get decapped, full length sized, and trimmed to length ( power trimmer), then cleaned in dry corn cob media. Then back on the press for loading useing a universal decapper just to make sure there is no media stuck in the flash hole at station 1.
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This has worked for 4895 extruded powder to meter very well
WIN 296 should give you no problem at all