You shouldn't need to replace the sear spring. My 795 will not cycle Winchester .22LR either, and I've had over 5000 rds through it, so it's definitely broken in. My 795 runs really well on Remington Golden Bullet 38Grn HPs from Walmart. Rem GBs run hotter than Winchester. I only use the Winchester .22LRs in my Russian Tula TOZ-78 bolt action.
Life can make you do many things, even kiss a man with a runny nose.
- Mihail Timofeevič Kalašnikov -