We are not talking about Lee moulds, and the Loadmaster wasn't around 25 years ago. Plus, as noted above, your comments are no help to the OP looking for tips to get HIS equipment running.
Not everyone has $3k lying around to buy a 1050 setup for a couple calibres.
So, do you drive a Mercedes Gwagon or Toyota Land Cruiser?
I am describing my experience with lee products in general in over fifty years starting with the two lee moulds. Various dies and moulds were given or included in trades with other items. The most recent was an undersize sizing die in .38 super purchased in an attempt to produce rounds for a borrowed custom Behlert gun with a tight chamber. How could they screw up a die, right? The nut that holds the decapping pin stripped the threads in the die the first time it was loosened to adjust the pin. A US $28.00 + shipping POS! Nothing I have tried by lee has been satisfactory, Nothing. All have been junk!
When I started in IPSC in 1982 I bought a lee 'production pot' bottom pour lead melter because of the price, $30 vs $150 for either Lyman or RCBS. Another POS, wouldn't work consistently, always leaked, etc. Spent most of my time casting trying to make it work. Waste of time. Gave it away. Bought the RCBS melter I still use today with NO problems in 25 years. My opinion that lee is junk is based on long experience, not conjecture.
Do you want to talk about bullet casting? I was a commercial bullet maker for years (Accurate Bullet Co., Wiarton, Ont) with a shop full of Ballisti-Cast automatic equipment. I made the best cast bullets and used them to win all my Provincial trophies (and several Miller Invitationals, Second Chance, Michigan championship '85, Cdn. Nationals, IPSC World Shoot '84 and '86, three gun matches, Cowboy matches, NRA Action Pistol, etc., etc.)
I loaded .223 match ammo on a 1050 with H4895 stick powder for a heavy barrel Colt I assembled that would shoot into 1/2 moa. I still have the trophies.
The best way for the OP to rectify his primer feed problems is to realize he has made a poor decision ,get rid of it and buy something that works. Ben is right, it won't even make a good boat anchor. Before the plastic primer system explodes into so much plastic schrapnel. A previous post had that experience along with pictures of the damage to his face immediately after. Lee has a warning not to use Federal primers because of this, and I believe they sell a 'blast deflector plate' to deflect the plastic schrapnel away from the operator. Lovely. Great if everyone in the room is wearing full face shields. You may not care if you are injured but how about your family? My grandaughter loves to help me load and cast bullets, does yours? Would you risk their eyesight?
I have a good friend that is having similar problems with a lee loadmaster and who has seen the light and decided to upgrade to better equipment, his choice is Hornady, I hope he gets a good one. I have an original Pro-Jector with a pos primer system that will not work. A beautiful press but it doesn't work, a pos!
I have always recommended Dillon, because it works. Because it has the best warranty in the business. No bullshyt warranty. Lifetime. Transferable. The best. Over a lifetime it is cheap. It is an investment you can use then in twenty years it can be sold for more than twice what it cost. You do the math.
You cannot even begin to learn to shoot if your equipment doesn't work. If your gun and ammo don't work you won't finish the match. And you won't be in shooting very long. It is that simple.
I find it amusing that some shooters when they realize they have made a poor decision in equipment or defend someone else who has will resort to name calling (dim-witted snob, etc etc) to defend their actions. This is the tactic used by liberals and others of the left wing whose first tactic when confronted with reason is to resort to slander and defamation of the other person. You imply I am rich, 'well-heeled', do I drive a MB or Land Cruiser? Hardly. My car is an '03 Hyundai Elantra. I have always worked for a living. I spend my money on quality equipment, not junk. It is an investment you can use, in twenty years it can be sold for more than twice what it cost.
My Dillon 1050 has paid for itself several times over by loading ammo for other people in the past. It financed the other two 1050s I had. The two 550s and two Square Deals were won at matches. That's right, seven Dillons, along with my first press, a Lyman Comet C,and Lyman All American Turret. It was an impressive loading bench. And it all worked, all of it.
If your expectations are low, enjoy endless frustration trying to get poor shoddy equipment to work, and don't mind never winning a match then lee junk is perfect for you. Good luck.
These are my opinions based on a lifetime of experience in shooting. Yours may differ.
'Shoot fast and don't f#ck up!'
Bryan Marino