I just ordered a .22 air rifle to repel bird feeder boarders. Range will be short, +/- 10 yards. Ethical clean kills are important (though not illegal here, this may be, er... unpopular). There's 400+ yards of private, wooded property downrange from the feeder. I'm expecting about 850-900 fps with lead. I understand I will have a break in period and some sighting in, and that these rifles can be finicky about pellets. Seems like there's a million to choose from. What pellets should I start with? What pellet is working well for you? Thanks.