counter bored?

[E Michael]

Not sure if I spelled that correctly.if I understand right the way to check is to put a bullet in the end of barrel and if it slides up past the actual bullet it is counter bored, but what does this mean, I'm sure I could google it but I prefer to hear from you folks.

[Springfield45]

If it is counter bored it will be very obvious looking at the muzzle. They do it do clean up the crown of the muzzle after the riflings are worn away. It was a quick fix to restore accuracy with out replacing the barrel.

[Crunch130]

E Michael,

The condition you describe could also be a very worn muzzle, usually caused by cleaning rod damage. Accuracy suffers badly. Counterboring basically establishes a new muzzle crown an inch or whatever in. You want the bore to end while there is still usable rifling.

Thanks,
Crunch

[GOEX FFF]

You also really don't need a bullet tip to check for a counter-bore. Visually you can see the absence of rifling in the first inch or so in from the muzzle.

[E Michael]

Seems my hex Izzy is counter bored my Izzy round is not

[Mr. Gillious]

yup.... just like mines

[cruddymutt]

Alot of folks will not buy a counter bored rifle. I used to be like that a long time ago but not anymore. I would rather have a counter bore than a rifle that doesnt but needs it.

[Capybara]

I have two Mosins, one counterbored, one not, no difference in accuracy.

[cheapblaster]

E Michael,

The condition you describe could also be a very worn muzzle, usually caused by cleaning rod damage. Accuracy suffers badly. Counterboring basically establishes a new muzzle crown an inch or whatever in. You want the bore to end while there is still usable rifling.

Thanks,
Crunch

This. The rifling extending to the end. Shine a light down the muzzle and look. A counter bored muzzle will show a smooth area for maybe 1/2", maybe longer, but it should look clean and machined. There will then be an end to the counter boring, it will be visible as an obvious shelf or point where the barrel changes to a slightly smaller diameter. At that point you should see the rifling in the barrel meeting that shelf.

A messed up muzzle will not have rifling extending to the muzzle and may, if you look closely at it be an ellipse, not a circle. Again, a light will help.

A counter bored muzzle should be more accurate than a rifle with a messed up muzzle. That is why it was done in the first place.

It is just part of the history of the rifle.

[Vlad 11]

This:

VS