A Boring Topic
When you can and can’t shoot a .177 caliber lead BB
By Dennis Adler
The operative word in Airgun Experience is experience, and the way you get experience is by doing things and often doing them wrong. Failure is the best teacher, and hopefully it isn’t always costly, just educational. One of the early mistakes I made was trying to shoot .177 caliber lead BBs from a semi-auto pistol chambered for .177 caliber steel BBs. Lead BBs don’t fit. An air pistol that shoots steel BBs and is marked .177 caliber (4.5mm) does not actually shoot a .177 caliber diameter BB. Now, if it is a pellet-firing rifled barrel pistol it can, because the bore on a .177 caliber BB pistol and a 4.5mm pellet pistol are not exactly the same. A steel BB will drop right through the barrel on a smoothbore blowback action BB pistol. A 4.5mm pellet won’t even fit if you try to insert it, whereas with a pellet firing pistol you can actually push the pellet into the barrel.