• This Forum is for adults 18 years of age or over. By continuing to use this Forum you are confirming that you are 18 or older. No content shall be viewed by any person under 18 in California.

Need 30 br reamer

al and alex are good guys and know a bit, BUT MY BLOWN out 30br cases with a 1.545 length and a .010 wall have .035" more case capacity . there is a benefit to blowing out vs expanding.
 
Alex, my 30BR's were all 1.5 degree leade and worked well. I don't mind a freebore of no more than .020.

Good shootin'. :) -Al

The 1.5 degree with "some" free-bore - up to about .030" is good with 7-8 caliber tangent ogive bullets. Bear in mind: the angle tolerance on all of my prints is +/- 15 minutes (1/4 Deg.) . . . for the short, light bullets, "shorter is better". :eek::D My top selling item is a tangent ten ogive configuration based upon the 1.00" long jacket: with, presumably (reamer print) 1.75 Deg. x ZERO "throating", the bullet base is only about .125" into the neck; the seven ogive x.925" jacket only go in about 0.030" deeper. ;) RG
 
Last edited:
al ( as I bow to one of the 30 br gods) the neck has volume specifically if you trim to 1.51 and I trim to 1.545..its .035" more...and yep my bullet is out at the end of the neck. and let me tell you with lt30 it counts.

How do you figure it has .035 more case capacity? :confused: -Al
 
...the neck has volume specifically if you trim to 1.51 and I trim to 1.545..its .035" more...

-Capacity is a measurement of volume
-
.035 is a numeric and has no volume value

A fired 1.510 long 30BR case holds an average of 40.8 gr. of water. A neck that is .035 longer on an identical 30BR case will only hold the larger volume of the .035 longer neck.

Small points to be sure. But these guns are built on small points. ;)

Good shootin'. -Al
 
I like that one, Alex.

I liked this one a lot:

yLaYkIUl.jpg
 
yes I did not calculate the VOLUME of a .035" longer neck.
that does not change the FACT that a .035"(1.545" case length) longer neck has more volume than a shorter case (1.510")
I have to settle lt30 at 36 gr to make room for my bullets even with a 1.545" case.
I was just trying to point out there is some use for that longer neck.

-Capacity is a measurement of volume
-
.035 is a numeric and has no volume value

A fired 1.510 long 30BR case holds an average of 40.8 gr. of water. A neck that is .035 longer on an identical 30BR case will only hold the larger volume of the .035 longer neck.

Small points to be sure. But these guns are built on small points. ;)

Good shootin'. -Al
 
yes I did not calculate the VOLUME of a .035" longer neck.
that does not change the FACT that a .035"(1.545" case length) longer neck has more volume than a shorter case (1.510")
I have to settle lt30 at 36 gr to make room for my bullets even with a 1.545" case.
I was just trying to point out there is some use for that longer neck.
Ken Howell provides in his Custom Cartridges tome a useful little sidebar ".308 bullet displaces 18.84 grains per inch" of H2O, so your .035" adds 0.66 grs to the case capacity. One can claim "Almost a whole grain!" and not be dead wrong.
-
 
The problem with small increases in volume is that they increase volume! You increase volume to make room for more powder, but increasing volume takes more powder to get back to where you started. You need to make enough of a change to actually see the benefit. Ideally you do it in a way that also handles pressure better. JMO
 
The problem with small increases in volume is that they increase volume! You increase volume to make room for more powder, but increasing volume takes more powder to get back to where you started. You need to make enough of a change to actually see the benefit. Ideally you do it in a way that also handles pressure better. JMO

Alex, approximately, how much is gained by, I presume, "Acklyizing" to 30BR? RG
 
alex,
it is not "increased",
it is what I have had from day one.
it is MORE volume than an expanded/short case.
more word games.
The problem with small increases in volume is that they increase volume! You increase volume to make room for more powder, but increasing volume takes more powder to get back to where you started. You need to make enough of a change to actually see the benefit. Ideally you do it in a way that also handles pressure better. JMO
 
I measured the case volume of my ff case( only one firing) as 40.9. maybe there will be more after the first real firing.
( this is lapua gold box, aprox 20 years old)

A fired 1.510 long 30BR case holds an average of 40.8 gr. of water.

Small points to be sure. But these guns are built on small points. ;)

Good shootin'. -Al
 
Last edited:

Upgrades & Donations

This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.


Click Upgrade Membership Button ABOVE to get Gold or Silver Status.

You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.


To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.

Forum statistics

Threads
166,856
Messages
2,223,958
Members
79,944
Latest member
GeorgeF
Back
Top