I only had 1 dud round out of the 150.
It would be worthwhile to figure out the cause of the dud.
If you try to fire it a second time and it does go off, it is likely that the primer was not seated fully. The first firing pin blow seats the primer, but does not have enough energy left over to set it off. The second blow sets off the primer.
If you pull the bullet and find powder inside, but the primer (decap the primer and view under a strong light) did not go off, it probably got contaminated. Make sure you handle primers with clean, dry hands, or better yet only primer handling tools. Modern primers seldom get contaminated because they are protected with foil and sealant, but it can happen.
If the primer did go off and there is powder in the cartridge case, you got either an extremely weak primer (and very lucky with regards to a hangfire) or the powder in that case was contaminated. Could there have been oil or water in the case?
If the primer did go off and there is no powder in the cartridge case, look at the base of the bullet and see if there is scorching on it. If so, you loaded an uncharged cartridge and got lucky the bullet did not enter the barrel. If it entered the barrel partway, your gun would have been jammed up (with a bullet locking the cylinder and barrel in alignment) with possibly some live rounds still in the other chambers of the cylinder.
If the primer did go off, no powder in the case and no scorching, you may have loaded a spent primer. Highly unlikely, but if you managed it, you need to review the layout of your loading bench.
If something goes wrong, it could go wrong again. If it happens a second time, you may be less lucky than the first time.
Lost Sheep