How old is the Desert Eagle and how many rounds through it? The dual-nested twin recoil springs do need replaced after so many rounds -- if your pistol is cycling but won't close all the way, I'd explore this idea.
Also, not that you are ignorant, but it always pays to mention since it wasn't brought up: No unjacketed lead bullets in a Desert Eagle EVER, as they will clog up the gas port and fixing this may be near impossible.
I run a Desert Eagle with 240gr Nosler JHPs and a stiff load of 2400. This load is max in some sources, a bit over in other sources, but it runs well.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.