I don't know who would tell you the Sciroccos ruin a barrel. I would say the opposite is true, they are a very soft jacket and take the barrel engraving quite easily. Perhaps it is thought that they ruin a barrel because the softer jacket will copper foul sooner than fully gilded alloy jackets. Some would interpret the loss of accuracy as ruining a barrel but all it needs is maintenance.
We see a degradation in accuracy as copper fouling builds. The main driver of this is carbon build up in the throat. The carbon being very hard cuts small particles of copper jacket material from the bullet which are vaporized in the hot gasses and then condense along the bore.
A regime of solvents to remove both carbon and copper is required, and in addition a polishing compound such as JB or ISSO is used to lap the throat every 250-300 rounds. This will prolong accurate barrel life by slowing throat erosion, as long as the polishing is done in a reasonable and controlled manner. Some people go to town on the polishing and over due it. Since I got a bore scope and can see the carbon and coper deposits and throat wear, the amount of polishing I do is reduced.
But to the original point, I don't think Scirocco bullets will harm a barrel, but inadequate or improper cleaning both will.
Bob
We see a degradation in accuracy as copper fouling builds. The main driver of this is carbon build up in the throat. The carbon being very hard cuts small particles of copper jacket material from the bullet which are vaporized in the hot gasses and then condense along the bore.
A regime of solvents to remove both carbon and copper is required, and in addition a polishing compound such as JB or ISSO is used to lap the throat every 250-300 rounds. This will prolong accurate barrel life by slowing throat erosion, as long as the polishing is done in a reasonable and controlled manner. Some people go to town on the polishing and over due it. Since I got a bore scope and can see the carbon and coper deposits and throat wear, the amount of polishing I do is reduced.
But to the original point, I don't think Scirocco bullets will harm a barrel, but inadequate or improper cleaning both will.
Bob
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