How long does a touch hole liner last

[foresterdj]

spare no expense.

A bent plastic coated paper clip.

[smoke]

I am not too experienced but I use a welding tip cleaner

[bluenoser]

If it is anything like my welding tip cleaners, I think it might be amongst the worst things one could use.

[Tenmile]

They can last a long time but they can also enlarge after so many shots. A good many years ago a man a couple of positions down from me complained about gas blowout from my rifle. On looking at it I noticed the touchhole seemed a little large. I replaced it and had no more problem. They probably make better quality now. But they are easy to replace and not expensive.
Lynn

[bob in the woods]

It depends on the pressures of the loads, much the same as the example of percussion nipple wear.  This was a problem in the conical/ bullet shooting rifles which was remedied by switching to a platinum nipple .