Ive run both corn and pellets through my 10 yr.old,but newly aquired Magnum 7500. Im currently using a 70/30 mix of both and I cant seem to get my draft and heat/stirrer speed settings right. No matter what I do it seems tat either A) the firepot overflows or fuel burns up too fast and the blower is kicking off constantly. I feel lik Im babysitting the thing way too much. Any and all suggestions or knowledge would be greatly appreciated. Thanks!!

The first thing I would do is get the fire burning correctly.
The reason the fan is turning on and off is that you are moving
too much air thru the heat exchanger and cooling it down.
This is hard on the stove.
The air flow thru the heat exchanger should be set with a
air flow gauge by a HVAC guy.
"Minimum hot air outlet static
pressure .2-.4 inches of water
column. Temperature rise set to
135-150 deg. F."
Hope this helps!
olf20 / Bob

The firepot should appear about 1/2 to 3/4 full after the furnace has been running for a while. A common error in running stoves and furnaces in to overdraft, and this will put more heat out the exhaust and less to the heat exchanger. I proved this by putting a meat thermometer in the duct above the furnace and closing the draft raised the temperature. If my exhaust is clean, I found I can completely close the draft on settings 1 and 2. On setting 3 I add some draft and 4&5 need a lot more draft. Settings 1-3 I leave the stirrer on 1. On setting 4&5 I put the stirrer on 3&4 accordingly. Some run the stirrer one number less than the heat setting. With pellets I get hard deposits on the firepot holes and this restricts airflow, so after a day or two of running, I increase the draft slightly. I can usually run a week before cleaning the pot.

Corn makes a lot of fly ash, although your mix with pellets will diminish that some. There are two chambers one on each side of the fire box. The narrow slots in the bottom of these chambers is where the airflow goes, and soot can quickly plug these chambers and greatly affect draft. AES recommends tapping the chambers daily with the stove tool to knock the soot down. With the furnace clean, you should be able to have a consistant burn.

The static pressure Olf20 mentioned is necessary according to AES for the most heat output and longevity of the heat exchangers.