ive seen a few rifles with a slight ring like bulge inside the barrel just an inch or so from the muzzle, you can see it when looking down the bbl and also feel it with a cleaning patch.
is this from having oil in the bbl getting forced forward when fired. the 3 guns ive seen dont appear to have been shot much but judging by the stocks have been out in weather a lot . so im thinking somebody left too much oil in bbl. ive seen guns blown up by snow so i dont think its from that. i read something in shotgun news about oil bulging bbls but they didnt say what it looked like. any body know for sure

The ring can be caused by any obstruction no matter how minute. Oil, water, spider webs... That's why you should always run a dry patch down the bore before taking the gun out shooting. Depending on the location and severity of the bulge, it may or may not affect accuracy. Won't know until you shoot it. If it's right at the muzzle, a cut and crown will solve the problem provided the barrel is cut back far to eliminate any swelling.

What Westpac said.
Regards, Joe

What J.D. said malm said.

just wanted to add soemthing, as this topic is a sore spot with me. I always hunt with electrical tape over the muzzle, with that bit of tape held down with more electrical tape wrapped around the barrel. This will be used if I shoot and blow apart the tape over the muzzle. A LOT (!!!) of people have laughed at and made fun of me for doing this. I don't care what I am hunting, where it is, what the weather forcast is, what astrological sign we are in, or anything else - I have tape over my muzzle.

My best hunting buddy, who has made more fun at me than anyone else over the years, brought me his rifle because it would not stay on a piece of paper at 100 yads. I looked the rifle over and found a bulge in his barrel. With a large degree of arrogant smugness, i told him what was wrong and what caused it. He and I have huntedd several hundred days together, often with each of us hunting in the same truck. In north LA in the winter time the red clay is wet and sticks to everything and an open muzzle is some sort of red clay magnet. He refused to tape up his barrel under any circumstances. I have had to clean my barrel with the 102" steel whip CB antenna before, due to me having shot the tape off of my barrel and I did not have any more to cover the muzzle. A word to the wise - keeping tape over your muzzle is a lot more better than standing on top of your truck in the woods with a bent over steel whip in your hands, trying to get red clay out of your barrel.

A while back I conducted a test, not an official one, just something I was curious about. Putting tape over the end of your barrel will NOT cause accuracy problems or point of impact changes.

Try it yourself, it doesn't take much effort.

It is a great idea and who cares what the other guys think.

The column of air in the bore in front of the bullet will first compress slightly and then, well before the bullet reaches the tape, the compressed air (being pushed by the bullet) will blow the tape clear of the muzzle.
Regards, Joe

Why wouldn't the oil kind of get blown out the compressed column of air in front of the bullet? For example look at cast bullet shooters. They use all sorts of various bullet lubes and many are very very messy...why don't we see these barrels bulges a lot with cast shooters?

Up here in snow country, I would not dream of hunting without tape over the muzzles, applied exactly as Mark described. The only difference is that because I am always hunting with either a double shotgun, double rifle, or M/L Cape gun, I use 1 1/2" wide painters' masking tape because black electrical tape isn't wide enough. An additional benefit of the blue masking tape is that it stands out like a sore thumb and elicits even more hoots from the uninformed!

Tape over the muzzle is standard procedure for a lot of guys in Alaska, including me. Often, on the rifles that I hunt with mostly, I wrap extra tape around the barrel, to replace the piece shot out on the hunt, while I'm still out there.

KB

Does the color of electrical tape matter? could I use the grey on a stainless barrel?

kidding aside, I think it is a good idea, I haven't before because I have forgotten, but I will do so going forward. Do you guys usually just do one strip over the muzzle, a cross? It sounds like you want it blown off, and not the bullet going through the tape so you don't want it on there too tight.

Thanks all.

Red

quote:

Originally posted by Dago Red:
Do you guys usually just do one strip over the muzzle, a cross? It sounds like you want it blown off, and not the bullet going through the tape so you don't want it on there too tight.
Red

Doesnt matter how tight you put it...it'll be gone.

I cross 2 pieces like an X going down 1/2" or so, then do one wrap around the X. I also wrap about 10" or so around the bbl. to use when I shoot the 1st X off......been doing it for yrs. and would never consider hunting without the tape.

quote:

Originally posted by SmokinJ:
why don't we see these barrels bulges a lot with cast shooters?

Because that Lube is located on the Bullet.
-----

Hey Anukpuk, They can also have Rings which are caused by "Fillers".

And Mr. Sisk used to post on the Reloading Board about being able to blow a Muzzle Brake off of a 338WinMag with some kind of Load he was using. That was basically a barely controlled Secondary Explosion Effect where the Pressure Peaked as the Bullet was in the Brake. Had it occurred just a bit sooner, it could have put a Ring in the barrel, or split it.

i think the bullet pushes the oil untill it overrides it then bulges
the guns ive seen with bulge still shot unbelivanble good groups
these were all used guns at very cheap prices
groups around 3/8 @100
i even cut one off and accuracy remaind the same , and i wanted a carbine any way
i always use the thinnest 3m elec tape stretched across the muzzle and down the side of barrel about six inches, never run out of tape and if its cold out warm it up with hand around it for a minit and put more across after shooting

quote:

bulge inside the barrel just an inch or so from the muzzle

If not a manufacturing defect (most likely), YS of material exceeded due to overpressure. Hoop stress calc that location (usually thinnest sectional area before projo exit and depressurizing of tube). Pressure curves vary significantly with loads du jour.

Tape or oil or pixie dust ...?? No.