Seeing that this was a rifle cartridge I guess it goes in the "rifle" forum. At least 70% of the time when hunting whitetail in any kind of semi-open country, I usualy grab my Rem. 700 25-06. I had a chance yesterday for just a short while (after being relieved from helping take care of my ailing dad)to take to a deer stand for a late afternoon hunt. I grabbed the 25-06 and a handful of factory ammo. I had lucked onto Remington brand 120 grain PSP CoreLock's on sale at a store going out of business years ago for $2.95 a box! I bought all they had which was 11 boxes. This was the same ammo I grabbed. I loaded 4 in the mag. and left the barrel empty until I got in the stand. After it got dark (no deer) I took the round out of the chamber, put it in my shirt pocket, closed the bolt on an empty chamber and returned home. At home I emptied the magazine cleaned and put up the rifle, put the 4 rounds out of the magazine and the one that had been in the chamber back in the box. Then I reached in my pants pocket for the other 5 rounds and felt powder! one of the rounds had "lost" the bullet. I put the bullet and empty case on my bench, went and cleaned the powder out of the pocket then started to check out matters. When I put the bullet in the case mouth except for the crimp it was very loose. I tried a .257 bullet out of a box of Sierras on the loading bench and it was tight. I then miked the bullet VIOLA .243 diameter! I then weighed it........105 grains! I have never owned, or had on hand any .243 caliber bullets. The case is/was factory. Never been reloaded, it was factory all the way. It was evident that the crimp was more than the crimp is on other bullets in those boxes. All I can see is that somehow at the factory that 105 grain .243 bullet got mixed in with the 120 grain .257's and it managed to stay in place long enough for the crimping stage of the loading process to crimp it in place. This held it until it got jiggled around in my pocket. With my luck it's a wonder I did not have that one in the chamber, have a 10 point step out 50 yards away, me fire at it, and the bullet rattle down the barrel drop out of the muzzle and fall on my foot! I am not condemning Remington, but its a good idea to check all ammo, factory ammo included.