Reamers for noobs - 7mm RSAUM

fightthenoise

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Joined
Feb 17, 2017
Messages
170
I'm about to order a Tikka prefit from Carbon6. It's going to be chambered in 7mm RSAUM, but I want to shoot 180 ELD-M's. From perusing the threads by those who have come before me, SAAMI freebore is 0.090, but I need something like 0.250 or so to seat the 180 ELD-M at a reasonable length and still have 0.020 jump or so to the lands. I'm not worried about magazine length.

So I need to send Carbon6 a reamer. Do I load up a dummy round and have one made? If so, who should I go to for that? Or are there reamers out there floating around that I could rent? Something tells me I'm not the first fella that has needed this reamer, and it would cut down on my lead time quite a bit if I could borrow an existing one. I've never had a barrel custom chambered. I've done prefits, but they've always been SAAMI.
 

shortgrass

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Mar 31, 2010
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3,027
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Western Oklahoma
If you are planning something 'special', you need to have your own reamer. As what you want is longer throat than SAAMI, the throat could be lengthened using a 'throating reamer' in the same set-up the chamber is cut in.
 

fightthenoise

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Feb 17, 2017
Messages
170
I learned today about the uni-throater from PTG. Gonna let Carbon6 chamber it to SAAMI spec and then extend the throat myself.
 

jrock

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Mar 12, 2014
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1,244
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Idaho
Will Carbon6 throat with a dummy round? If you have the parts, that might be the easiest route. The uni-throaters are pretty expensive for one off use.
 

tobnpr

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Joined
May 30, 2013
Messages
253
Rent the Uni-Throater from 4D. Provided you're sticking with SAAMI neck that's all you need.
While Carbon6 could/would easily use a custom reamer I sincerely doubt they would get into custom smithing with throating reamers, etc.
It's a whole 'nother ballgame.
 
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