Barrel chambered with wrong shoulder anfle

[Edd]

Look's alien.
Isn't the base diameter on the WSM about 0.020" larger in diameter than the SAUM? how could a WSM case be swagged down to fit into a SAUM cut chamber?

There is about .005" difference.

 

[MagMan]

Odd duck for sure.

I'm interested to hear what your smith has to say.

 

[ShtrRdy]

Print out the cartidge and chamber drawings from the SAAMI website and then explain to the gunsmith why what he gave you is not what you asked for.

 

[Pdvdh]

There is about .005" difference.

So much for Wikipedia... Even 0.005" compression at the web, the strongest sidewall portion of the case, would prevent chambering and closing of the bolt. But maybe there's enough tolerance that the specified 0.005" turns out to be less in real life, between the tolerance in the casing specs and the reamer specs.

 

[Pdvdh]

There is about .005" difference.

Both Wikipedia and my ColdBore 1.0 ballistic software program library show the base of the 7mm WSM to be 0.020 - 0.0205" larger in diameter than the 7mm SAUM. Are they both producing faulty case base (web) diameter data? I don't own a SAUM, so I can't take the measurement with my caliper.

If the base diameter is 0.020" different, there's no way the case with the 0.020" larger base diameter will enter the smaller chamber diameter, and allow bolt closure. Even if a SAUM reamer was run in the extra depth the diameter would be way too small for the case with the larger base to enter.

 

[adam32]

What brand reamer?

The gunsmith may "think" he does have a correct WSM reamer but maybe it's a reject reamer that's wrong.

Call him and ask him what brand reamer and for a reamer print then compare with your fired case and a WSM reamer print from a different company.

 

[Pdvdh]

What brand reamer?

Mars or Pluto... Uranus, errr maybe that's the gunsmith...

Something or someone is defective. Big time bummer!

 

[bigngreen]

What brand reamer?

The gunsmith may "think" he does have a correct WSM reamer but maybe it's a reject reamer that's wrong.

Call him and ask him what brand reamer and for a reamer print then compare with your fired case and a WSM reamer print from a different company.

Taking bets on PTG!?!?

 

[bigngreen]

WSM won't go into a SAUM chamber without a LOT of work!!!

 

[tbrice23]

Taking bets on PTG!?!?

He said PTG

 

[tbrice23]

Also, I sent in some cases fired in this chamber, fired in my old 7wsm barrel, and some sized cases from my die.
In order to size a fired case enough to re-chamber in this barrel, the shoulder datum point on my headspace comparator moves .021".

 

[Pdvdh]

7mm Alien, by PTG.

110% Wildcat. No taming this beast.

 

[tbrice23]

Lol, might as well laugh. But I actually feel like crying.

 

[tbrice23]

The build turned out beautiful. Too bad I cant shoot it.