Newbie ammo question

New to air gunning and trying to learn a little and I have a couple of probably dumb questions, so here goes. Do air rifles have a break in period? Do different brands/models of air rifles shoot better or more accurate when using a certain pellet? I just bought an Umarex Octane .177 and was surprised and a bit overwhelmed when I had to choose which ammo to buy. So I was wondering if anyone else owned the same rifle they could share their choice in ammo. Or are all rifles different and will I have to try different pellets to see which shoots best out of my rifle? BTW - I mainly just shoot targets . Thank you for your time.
 
cally is right 

​all riffles unless pre owned have a break in where the actions need to become a bit smother as well as the barrel needs to be shot probly on average about 100 shots before the groups tighten up a little
as for pellet again he's right every barrel can be picky and finding what weight and brand works best s key
​for a .177 a big thing for you is going to be fps so a heavier pellet might work well for you unless you get lucky but this is also depending on how far your going to shoot
​if your going to shoot only 30 yards a lot of pellets will work well but pushing out past 50y you'll be testing a good bit
 
Cally and Gorgata are both right on, Here are a couple other things: steer clear of the big box non-lead pellets (PBA) they usually give poor accuracy in a springer like yours. Domed pellets usually shoot best in most rifles at longer distance, for close range (10 yards) target shooting a flat head wadcutter may be best. Probably the best pellets available at your local store will be Crosman Premier hollowpoints in the screw tin, if your gun likes those, you're good to go! Some of the best brands to try are JSB, H&N, and RWS.
If your rifle has open sights it would be a good idea to test pellets for accuracy using just the open sights. Once you've got the rifle grouping THEN mount your scope and sight in, the recoil of a springer can move the scope and/or mount and that will make you crazy! (Ask me how I know this, LOL)
A springer like the Octane shouldn't be held tight like a firearm, research the "artillery hold" and experiment to see what hold your rifle prefers. (hope you have lots of ammo!)
Finally if your groups open up suddenly, check that the stock screws are snug.
Shoot it a lot and have fun!
John
 
snosurfer I see the Umarex Octane is a powerful gas ram rifle. With that is mind heavier pellets will probably be better than lighter pellets. Also depending on how far you shoot the dome pellets should do better accuracy wise once you get out past 20 to 25 yards. At Straight Shooters they did a review of your rifle which may give some insight and tips for you. Bill
http://www.straightshooters.com/umarex-octane-.177-combo.html