Awhile back I got a gun used. It is a NEF Survivor rifle. There is no caliber listed on the barrel. From what I can discern these guns only come in .223, 308, or .410/45 long colt. This one has a rifled barrel but also has a shotgun choke in the buttstock. I'm pretty sure it is a .410/45 long colt, I will confirm with the guys at the local gun store that I have the appropriate caliber and that the gun is good to go before using. My questions is this, I bought this gun believing it was a .410 for my son to use on squirrels. I have never used a 45 long colt caliber. Is this an appropriate caliber for deer? If so whats the recoil like. Obviously if so I will have him practice with whatever we will use so he would be ready, but if it is an appropriate caliber does anyone have any ammo recommendations. I kind of fell into this gun and now I'm thinking it might be a wonderful starter gun for my son if I can learn more about it. Its a scoped single shot that's short enough for him and he could use .410 for squirrels and possibly the 45 long colt for deer, I was hoping the gun is appropriate as it would give him more familiarity using the same gun for everything for the next couple years. Thanks for any input concerning this gun or either of the calibers and ammo recommendations for a young hunter.