Indy;
Unless there is a pronounced difference in your patters, I would not worry about this. If you are concerned and really want to know for your own peace of mind, take your gun to a gunsmith and have him "slug" your barrel and he should be able to tell you or even show you the grooves and lands of the barrel.
You did not say what gun you are comparing or the barrel length which may have to do with the number of striations you will see.
UF
Unless there is a pronounced difference in your patters, I would not worry about this. If you are concerned and really want to know for your own peace of mind, take your gun to a gunsmith and have him "slug" your barrel and he should be able to tell you or even show you the grooves and lands of the barrel.
You did not say what gun you are comparing or the barrel length which may have to do with the number of striations you will see.
UF