I am shooting a 6BRA for F-class midrange. My gunsmith, who chambers my barrels, has his own reamer that I use. I have been very successful with it. I will be moving shortly and am kicking around the idea of buying my own reamer. His reamer that he uses on my barrels is a .272 chamber with a .104 freebore. These are the only specs my gunsmith knows about his reamer. Doing research, I want to keep it a .272 neck but have a longer freebore, likely a .120, based on my research. I mostly shoot 108s and 109s and Lapua brass. Does this sound like a good idea? Also, no reamer manufacturers I have found make this as standard. Can I custom order this? Would I need both a rough and finish reamer? Any help would be appreciated!
6BRA Reamer Help
- Thread starter a-dog
- Start date
Buy your own reamer and take good care of it. JGS would be my first call. Manson makes a very fine reamer as well. No surprises from chamber to chamber is always a good thing. Shoot straight.
Paul
Paul
I’ve shot a .120 FB with 108 Bergers, it was set up by another fella before I bought the rifle.
It shot very well with the longer bearing surface 108’s and I thought it was a smart choice.
Jeff Porter
Gold $$ Contributor
I am using the Manson 0.272 no turn with 0.104" free bore and shooting great in a Bartlein 5R with 105,107,108, and109 bullets.
Edit to add- these bullets seat with the boat tails at the neck shoulder junction so you wont be gaining much of any capacity seating them out further, only more donuts.
Edit to add- these bullets seat with the boat tails at the neck shoulder junction so you wont be gaining much of any capacity seating them out further, only more donuts.
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So you would recommend sticking with a standard .104 reamer if I am shooting 108s and 109s?
Jeff Porter
Gold $$ Contributor
It is working for me with Bergers, SMK and ELDMs and Ray Gross designed it for those bullets.
I shoot the 108 with a .104 reamer as well.
Jeff Porter
Gold $$ Contributor
I just did some math with the 105 Hybrids I am loading today. The brass is 1.555” OAL, the case neck is 0.310” long. From the reamer print and my brass, case base to shoulder junction is 1.119”base to neck shoulder junction is 1.245”. Subtracting the bullet length from a round seated 0.020” off touch, I calculate the base of the bullet is 1.130” from the case base.
This tells me that the bullet is 0.115” into the shoulder area. The boat tail on the 105 is 0.213” so about 1/2 a boat tail into the shoulder. My load of H4895 that gives me 2920 fps fills just up to shoulder so not compressed at all. I checked and I can get another grain and a half of H4895 in the case to be starting to hear crunch.
Even a 110 Atip will fit in this profile.
This tells me that the bullet is 0.115” into the shoulder area. The boat tail on the 105 is 0.213” so about 1/2 a boat tail into the shoulder. My load of H4895 that gives me 2920 fps fills just up to shoulder so not compressed at all. I checked and I can get another grain and a half of H4895 in the case to be starting to hear crunch.
Even a 110 Atip will fit in this profile.
WSnyder
Silver $$ Contributor
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