7 SAUM reamer drawing

[thaught]

I'm wanting to maximize the 7 SAUM case shooting out of a long action and was curious to hear some more experienced opinions other than my own. I tend to shoot the 180 VLD target bullets

It seems a saami freebore is .090". With this reamer it shows .290". Is this too much freebore? I noticed many folks, when referencing the same cartridge/bullet cartridge refer to .200" of freebore as ideal. Is that because .090" is considered saami and then add an additional .200"?

 

[FEENIX]

I'm wanting to maximize the 7 SAUM case shooting out of a long action and was curious to hear some more experienced opinions other than my own. I tend to shoot the 180 VLD target bullets

It seems a saami freebore is .090". With this reamer it shows .290". Is this too much freebore? I noticed many folks, when referencing the same cartridge/bullet cartridge refer to .200" of freebore as ideal. Is that because .090" is considered saami and then add an additional .200"?

I remember the advice given to you by another LRH member from .200" (175) to .230" (for the 195), and I said to go with the .215" to average the two on your other thread. My latest build a .338 Thor (NMI), Manson built it with a .220" freebore. My advice is whatever freebore you decide on your chamber reamer is also to ask Manson to make you a corresponding sizer reamer so your GS can build your custom dies using blank dies.

 

[thaught]

I remember the advice given to you by another LRH member from .200" (175) to .230" (for the 195), and I said to go with the .215" to average the two on your other thread. My latest build a .338 Thor (NMI), Manson built it with a .220" freebore. My advice is whatever freebore you decide on your chamber reamer is also to ask Manson to make you a corresponding sizer reamer so your GS can build your custom dies using blank dies.

Great advice was given, I'm just trying to learn/understand why it was good advice. Haha

 

[FEENIX]

Great advice was given, I'm just trying to learn/understand why it was good advice. Haha

Learning never stops when you are open-minded.

 

[lancetkenyon]

.090" is short.
.290" is long.
.200" is even pretty long.
For a 7SAUM, I wouldn't personally shoot any heavier than a 184 Hyb. So that leaves the 195 and 197s out. So that .200" sounds perfect.