7 SAUM chamber question

[MuleyFever]

If I had a 7 SAUM with a SAAMI chamber would I be able to seat 162 ELDX out far enough to not limit case capacity? What max bullet weight are we looking at before you would want more freebore?

 

[Ucsdryder]

Dunno but why would you want to be limited? Assuming you have mag space then extend the freebore and open up your options!

 

[MuleyFever]

Dunno but why would you want to be limited? Assuming you have mag space then extend the freebore and open up your options!

Just looking at prefits and they usually say SAAMI specs.

 

[Ucsdryder]

Just looking at prefits and they usually say SAAMI specs.

Yeah I had the same issue when I built mine. I ended up finding a gunsmith in Denver that can extend the freebore. Call around and see if you can find someone local to you. Make sure it’s someone you trust tho!

 

[Mark at EXO]

SAAMI chamber here and I've been happy with what I get out of 155 Hammers, 160 Noslers, 168 VLDs, and 175 ELD-X with RL-23.

 

[Brianb3]

SAAMI chamber here and I've been happy with what I get out of 155 Hammers, 160 Noslers, 168 VLDs, and 175 ELD-X with RL-23.

What action you running mark? TYIA


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[Ucsdryder]

SAAMI chamber here and I've been happy with what I get out of 155 Hammers, 160 Noslers, 168 VLDs, and 175 ELD-X with RL-23.

You must be seating those bullets pretty deep into the case to get a 175 to fit in a saami chamber.

 

[Mark at EXO]

What action you running mark? TYIA

XM Length anTi-X. Wasn't planning on a SAAMI chamber, so that's why I went XM. Long story... haha.

You must be seating those bullets pretty deep into the case to get a 175 to fit in a saami chamber.

2.220 CBTO. They're about 2.905 COAL, if I remember correctly. I'd have to go verify.

 

[N2TRKYS]

Yeah I had the same issue when I built mine. I ended up finding a gunsmith in Denver that can extend the freebore. Call around and see if you can find someone local to you. Make sure it’s someone you trust tho!

How much extra speed did you pick up?

 

[Ucsdryder]

How much extra speed did you pick up?

It’s not about speed, well I guess kind of. It’s about case capacity and potentially the dreaded carbon ring.

 

[Cahunter805]

It’s not about speed, well I guess kind of. It’s about case capacity and potentially the dreaded carbon ring.

Carbon ring or Donut issue?

 

[Cahunter805]

If I had a 7 SAUM with a SAAMI chamber would I be able to seat 162 ELDX out far enough to not limit case capacity? What max bullet weight are we looking at before you would want more freebore?

What action? Many places will chamber a prefit and can lengthen the throat also.

 

[Ucsdryder]

Carbon ring or Donut issue?

DOH! Yes, donut, which I believe is also a carbon ring. Got my dreaded issues mixed up.

 

[Cahunter805]

DOH! Yes, donut, which I believe is also a carbon ring. Got my dreaded issues mixed up.

Carbon ring is a chamber/barrel issue. Donut is a brass issue at the neck/shoulder junction.

 

[Forest]

SAAMI chamber here and I've been happy with what I get out of 155 Hammers, 160 Noslers, 168 VLDs, and 175 ELD-X with RL-23.

I too would be curious how long you can load the 155 hammers?? My smith will be extending my throat to the dummy round with that bullet. The eld-x must really be pushed down in there it's even longer yet.

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[MuleyFever]

What action? Many places will chamber a prefit and can lengthen the throat also.

I have been thinking about putting a prefit on a Tikka.

 

[N2TRKYS]

It’s not about speed, well I guess kind of. It’s about case capacity and potentially the dreaded carbon ring.

When does the carbon ring show up?

 

[Deerfield]

Are you guys that are extending freebore buying prefits and having a smith extend or are you better off getting a blank and having a smith do it all?

 

[Ucsdryder]

When does the carbon ring show up?

Carbon ring shows up in your barrel. Affects accuracy and can cause pressure issues. Donut shows up in the case and from my understanding is often caused when bullets are seated past the shoulder neck junction.

 

[Cahunter805]

Carbon ring shows up in your barrel. Affects accuracy and can cause pressure issues. Donut shows up in the case and from my understanding is often caused when bullets are seated past the shoulder neck junction.

The donut is caused by sizing the brass multiple times and brass flowing from the thicker shoulder into the neck.
It’s also best when neck turning to cut into the shoulder just barely to help eliminate this.
When you seat a bullet past the neck shoulder junction with a donut present you can definitely feel it.