Originally Posted by tankwilson
So im getting ready to get my sig mosquito. I have my cci mini mag 100 box and a 550 round federal box. I have compared everything and all the specs are the same. I know they recommend using cci for breakin but what happens when I run out. Will the federal work the same? Whats the difference?
Normally, the difference is immaterial. The Mini Mags have a better reputation. Some guns just love the Feds, while others (of the same model) don't. Rimfire pistols are a lot less consistent in their behavior than centerfire guns. If the gun keeps telling you it doesn't like certain ammo, take heed and try something else. Malfunctions will not ruin the pistol, the cartridge is soft and will break itself rather than the internals. Also, sometimes HP's have trouble feeding into the chamber, at least initially. It is good you have at least 2 brands of ammo to cross check if a problem is ammo related.