Calling all 6 Creedmoor Reloaders

[Hoot]

I just got a new barrel for my Gen 2 RPR in 6 Creedmoor. After a quick patching, shooting one fireforming load to make a Hornady Case Length Gauge body from and measuring some of my favorite bullets that I have used in my 6XC, I was left with a conundrum. Unlike my 6XC, Most of them don't have much shank in the neck when I hit the lands.

Examples:

Sierra 110 SMK 2.921 COL with ~.133 shank in the neck
Hornady 108 ELD-M 2.813 COL with ~.185 shank in the neck
Sierra 107 SMK 2.79 COL with ~,143 shank in the neck
Berger 105 Hybrid 2.852 COL with ~,146 shank in the neck
Sierra 95 TMK no usable shank in the neck at the lands
Forget anything lighter...

For those of you who have done similar measurements, has that been you experience as well?

I generally don't get the warm fuzzies without at least one caliber of shank in the neck. Of course, I don't necessarily need to load my rounds at or into the lands but in the case of the 108 ELD-M, that was where I got my best performance in my 6XC.

Up here, comfortable shooting weather won't return until late March or early April, so there's not much development going to take place until then. I don't enjoy shooting bundled up like the Michelin Man.

Hoot

 

[shoot308]

It depends on the freebore of the reamer used. I used a .040 freebore when I built mine to hopefully increase longevity. Sounds like you have a long freebore.

 

[TIMMY]

If using new brass to fireform i always shoot them twice . One time might not fully size

 

[46and2]

I just got a new barrel for my Gen 2 RPR in 6 Creedmoor. After a quick patching, shooting one fireforming load to make a Hornady Case Length Gauge body from and measuring some of my favorite bullets that I have used in my 6XC, I was left with a conundrum. Unlike my 6XC, Most of them don't have much shank in the neck when I hit the lands.

Examples:

Sierra 110 SMK 2.921 COL with ~.133 shank in the neck
Hornady 108 ELD-M 2.813 COL with ~.185 shank in the neck
Sierra 107 SMK 2.279 COL with ~,143 shank in the neck
Berger 105 Hybrid 2.852 COL with ~,146 shank in the neck
Sierra 95 TMK no usable shank in the neck at the lands
Forget anything lighter...

For those of you who have done similar measurements, has that been you experience as well?

I generally don't get the warm fuzzies without at least one caliber of shank in the neck. Of course, I don't necessarily need to load my rounds at or into the lands but in the case of the 108 ELD-M, that was where I got my best performance in my 6XC.

Up here, comfortable shooting weather won't return until late March or early April, so there's not much development going to take place until then. I don't enjoy shooting bundled up like the Michelin Man.

Hoot

FWIW, my stick shift and gas 6cm both shoot best at .060" jump.

Pretty sure the bolt action shooting 105 Hybrids only has half the neck seated.

 

[JimSC]

Looking at my old load data the 107 SMKs shot best at touch, I retired that barrel so I have no idea how much shank that left in the neck

 

[Iowa Fox]

Check the pics in this thread- click the link on post #9

6mm Creedmoor Freebore

The folks doing my 6mm Creedmoor barrel have two reamers both 275 neck and a 123 or 190 on freebore. I want to ask the experts here for their opinion. The bullets I intend to use would maybe be Hornady 108 eld 107 Smk 105 Hornady match and maybe 95 Smk or Berger Kind of the same bunch or...

forum.accurateshooter.com

 

[Hoot]

Check the pics in this thread- click the link on post #9

6mm Creedmoor Freebore

The folks doing my 6mm Creedmoor barrel have two reamers both 275 neck and a 123 or 190 on freebore. I want to ask the experts here for their opinion. The bullets I intend to use would maybe be Hornady 108 eld 107 Smk 105 Hornady match and maybe 95 Smk or Berger Kind of the same bunch or...

forum.accurateshooter.com

Now that was some good meat to chew on!
Thank you for the links.

The original Ruger barrel definitely has a shorter freebore than the new barrel. on the SAAMI web page, the reamer looks like .180. More on this later

Hoot

 

[JB10]

I have a ruger American predator in 6mm creedmoor. When i measured using the 108 eldm i found that the factory loads were .020 longer that what i measured touching the lands and this is after it had been shot several times. I chambered several rounds and no marking on the bullet that they were touching rifling. So i tried loads that long and worked shorter. Found best group .010 longer than what i measured my chamber and was .005 shorter than factory loads.