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????Figuring free bore????

 
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Old 05-01-2010, 09:16 PM
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????Figuring free bore????

I'm tossing around getting a reamer for a 270 WSM and I have found a couple that might work but I don't quite know how to figure out what kinda free bore I want.
I have room in my magazine to push the bullets out farther and I want to have that for a new barrel. Any help would be great!!
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Old 05-04-2010, 01:04 PM
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Re: ????Figuring free bore????

Quote:
Originally Posted by bigngreen View Post
I'm tossing around getting a reamer for a 270 WSM and I have found a couple that might work but I don't quite know how to figure out what kinda free bore I want.
I have room in my magazine to push the bullets out farther and I want to have that for a new barrel. Any help would be great!!

I am going through the same process with a 22-250. I want to have a reamer made
with the freebore at .224 instead of the .2244 that leaves the throat long due to
starting at larger than bullet dia. Of coarse the idea comes from the Wylde .223 chamber
design. After loading and shooting the Wylde chamber I no longer believe the theory that
a round won't chamber if the case neck is a little off center. I haven't decided on twist
or land count either. I want to shoot up to the 69 smk's and down to 50's. I haven't
seen anyone try a 22-250 with an 80 grain pill for really long range but it should do
well.
Not trying to hi-jack your thread, just drum up some interest on the subject.
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Old 05-04-2010, 11:04 PM
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Re: ????Figuring free bore????

What bullet are you planning on using?
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Old 05-04-2010, 11:30 PM
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Re: ????Figuring free bore????

Kevin, I don't know if you meant to ask me or Loner. I'm wanting so set up for a 150 Berger and the 169.5 Wildcat if we see it.
I found a good deal on a reamer but it lists the freebore as .187 but I don't really know how to figure or measure what it take to get a freebore measurement for the reamer.

I was thinking of measuring from the neck of the case to the ogive but I have no idea what is right.

Thanks for responding, guys hijacks welcome!
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Old 05-05-2010, 12:05 PM
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Re: ????Figuring free bore????

You have to combine the freebore with the throat width and figure how far
down that angle the bullet will actually have to travel before touching. Sin,
cosine and tangent. Remember your high school trig.?
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Old 05-05-2010, 12:50 PM
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Re: ????Figuring free bore????

Go to Pacific Tool and Guage and ask Dave Kiff for suggestions and to send you a suggested reamer print for the bullets you are thinking shooting.

He can have you a reamer to your specs within 30 days normally also.

BH
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Old 05-05-2010, 08:51 PM
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Re: ????Figuring free bore????

bigngreen,

I was asking which bullet you were going to shoot. The 270 WSM according to Dave Kiffs book of reamer prints has no throat and only.0185 of lead. I have some reamers with the throat (aka free bore) built right into the reamer which is nice, sometimes. But for alot of the type of rifles I build, my customers are shooting the longer heavier bullets and each one wants their throat set a little different. I like to have a little shorter throat then have a customer supplied dummy round with the bullet seated to where they would like it. I then can go back in after the head space is set and set a custom throat length to match the dummy round. But also as Bounty Hunter stated Dave Kiff is a very knowledgeable man about this stuff and he could grind the throat right into the reamer for whatever length of throat you want.
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