View Full Version : Help !! Just hope I didn't do bad...

August 7, 2007, 05:50 PM
Yesterday I receive an RCBS Precision mic.

With the free bore tool I think I f,u,c..ed my bolt.

I was chambering the tool when I noticed that I couln't close the bolt on the freebore tool. So I did something stupid, I slammed the bolt against the tool 3 times.

Now my gun as a problem. I have difficulty to chamber and extract factory rounds. Factory rounds chambers easely with fingers in the chamber , I can bring the bolt up to the case head easely too. It is when I want to lock the bolt that I am forcing too much. The same force is necessary to lift up the bolt.

Can a smith help me . The gun is the one in my sig.

I think it as to do with the extractor....



Harry Bonar
August 7, 2007, 06:49 PM
Mush, welcome to the forum!
As regards your problem I just don't quite understand what happened?
Did you have a "freebore" reamer in the chamber and slammed the bolt on it (in which case the reamer and probably chamber is ruined) or something else?
At any rate, the bbl, ought to have a properly reamed chamber in it and factory cartridges of the proper caliber should close easily (with proper headspace of course) and fire with no abnormal marks on the case.
Freebore - in certain cases freebore is not altogether a bad thing although a straight throat for a short distance with a normal leade like A-Square has is much better.
We need more info to diagnose this.
Welcome to the forum!
Harry B.

August 7, 2007, 07:18 PM
No harry, the freebore tool is made by RCBS to mesure the distance from the bolt to the lands. It is essentially a dummy round that adjust itself when you close the bolt. I don't know why, but since having slam the bolt on the device to lock the action, I have problem.


August 8, 2007, 11:42 PM
Have you visually inspected the chamber? It is possible you gouged the chamber or deformed the shoulder maybe, causing the round to hang up. That's the only thing I can figure.

You say you think it's the extractor, why? Does it look different?

Harry Bonar
August 9, 2007, 02:25 PM
Those "freebore tools" are just like fish baits - they are very good at catching the fisherman - not fish.
The only way a "freebore" can be ascertained is by the reamer you buy with freebore cutters incorporated in the reamer - I put no stock in them!
Get the loading manual - Any Shot You Want - The A-Square Shooters Manual. Every, I repeat, every aspect of riflrey is covered in a very inclusive and professional manner. I cannot recommend it to highly.
Freebore is supposed to reduce pressure of engraving the bullet because so, so many idiots want to shoot a bullet as fast as possible (this does not always result in higher velocity) out of a rifle.
Medium velocity/heavy good sectional density cartridges are far, far more likely to achieve great kills than super fast bullets that often give big flowering wounds, cause suffering of the game, and give shallow penetration which is the sine-qua-non of good cartridges!
There is nothing, nothing better than a good 30-06 for any game, light or heavy. Of course for dangerous African game I like the 9.3s and the 416s. and they belong to the same class!
No game will know the difference of 300 more feet per second round or 300 fps. less of the same bullet weight.
People who come into your shop and with an all-knowing dogmatic attitude telling you they shot their game at 400 and 800 yards are making fools of themselves to knowledgeable riflemen. No one, NO ONE, has any business at all, in any climate or circumstance has ANY BUSINESS shooting at an unwounded animal much over 250 yards - I'll stand on that..
Get a good 30-06/24"bbl. shoot 180 gr. good bullets and forget everything else. Sorry forthe lecture!:)
Harry B.

August 9, 2007, 02:36 PM
I'm trying to learn. A freebore reamer is used to alter the chamber, or the throating, or both, right? I presume that it makes the chamber longer (larger?) to specifically match the brass and bullet that you want to load?

Is this correct?

Harry Bonar
August 9, 2007, 06:16 PM
The freebore reamer doesn't alter the chamber - it elongates the leade (the "guide" that lets the bullet be engraved by the rifling) not the chamber - it's dimensions will be the same. In other words it is making the bullet be engraved by the rifling more gradually.
With freeboring you usually need to increase your powder charge - not always!
Weatherby uses freeboring due to the high pressure their cartridges usually run at.
You see - the pressure of your cartridge is only at its maximum for about 3" out of the case - you can look at the taper of your bbl. and virtually see the pressure curve - freeboring just is "supposed" to make pressure more gradual as the bullet leaves the case and contacts the rifling "leade".
The best arrangement is A-Squares idea of a paralel throat; with a 308 dia. bullet it measures .308 dia. - the throat for a short distance would be .3085 or .309 - then a standard "throat (not freebored)" would be in place. The reason why some seat the bullet to "touch the lands" is to improve accuracy?? - but this raises pressure. We always seat the bullet just so it is behind the lands to give it a slight start - that is the aim in freeboring.
You might want to just touch your chamber with a finnishing reamer, re-check headspace and try it or set the bbl back 1 turn and re-chamber?
I hope this helps!!
Harry B.

August 9, 2007, 09:27 PM
Thanks Harry. I understand a lot better now!