Reamer and Freebore

[joelkdouglas]

Gents,

I have a 6 BR reamer with 0.090 freebore. I bought a 6 BR Hornady case (with the OAL tool) to determine the distance to the lands for a barrel, but the Hornady tool case was too wide to fit in the chamber (0.2705 neck). I attempted to neck turn the Hornady tool case so it would fit, and the darn thing broke.

However, I know the freebore, so...

Can I just add the SAAMI cartridge length (1.560 in.), plus the freebore (0.09 in.), and that should be where the lands begin (1.650 in. CBTO)? I also understand other techniques for finding the lands (smoke, sharpie, etc.), but I'm not sure I'll have much neck clearance to attempt those methods.

v/r
Joel

 

[Mega]

What I know a 0.2705" neck diameter is standard No Turn 6BR Norma. It should have fitted fine BUT a purchased Hornady OAL Case is not fire formed in your chamber and will probably give you a false dimension unless you compare it to your own fired cases and make the adjustment. No, you can not add the Freebore length as that does not take into account your ramp length or your own chamber length.

I'm a long way away to help but I'm sure if you drop a kind hint someone would make a Gauge Case for you, it's very easy.

 

[BradY]

Fireform a case, take a dremel to the case neck and cut vertical slit up it then long seat a bullet, put it into the action and close the bolt and extract carefully. Measure from the base of the case to the ogive with a comparator. Do it a couple of times to make sure you get consistent results.

 

[DOGCAPPER]

Taking the unloaded rifle, insert the bullet in question into the barrel until it is in contact with the lands.
Using a 3/16 dowel or brass rod insert down the muzzle end of the barrel until it makes gentle contact with the bullet nose.
Using a fine tip marker circle the rod as near the muzzle as possible.
Punch the bullet out, close the bolt, insert the dowel make contact with the bolt face and remark the dowel.
Measure from line to line, bottom side of each.
That measurement is COL to the lands.

 

[jonbearman]

Why couldnt you size the hornady case so it would fit the chamber alittle at a time tillit just fits and then polish the neck out so it wont bind i on the neck pushing the bullet in? I may be way out of line but?

 

[expiper]

I am an ole'timer,,,and do it without special tool,gadgets,gizmos,,,,just size a ctg in your type S die using a bushing that gives a small amount of crush,,,then load and seat a bullet and let the chamber push it into the case,,,,as stated earlier do it a few time to get an accurate measurement,,,,or you could use this same case over and over by pulling the bullet with your plier type puller,,,(most people have this stuff in their range box) ( I know most arent competetive "B"enchrest shooters!!),,,once you see how simple it is you will never go bak to the complexity of thes other devices,,,,Roger

 

[joelkdouglas]

Thanks gents. I'll try some of your ideas, I'm sure one of them will work! Probably most of them, actually.