Help Me With This Reamer Print 300 WSM

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by INTJ, Dec 20, 2018.

  1. INTJ

    INTJ Gold $$ Contributor

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    0BC9938C-E821-4155-8545-705B81651F82.png

    I want to make sure I am reading the print correctly. What is the freebore on this?
     
  2. Ledd Slinger

    Ledd Slinger Gold $$ Contributor

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    This is your freebore measurement.

    20181220_222102.jpg
     
  3. dkhunt14

    dkhunt14

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    I almost bet your going to have extraction problems after a firing or two. The .200 line should be .555 minimum. Matt
     
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  4. INTJ

    INTJ Gold $$ Contributor

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    Thanks. I don’t remember the throat being that short, 220 SMKs worked great. I guess I need to get a throating reamer.

    One year I shot five screamer groups, set two club group agg records, and won a bunch of matches with a barrel cut with this reamer. No extraction issues in 800 rounds. Back then I used standard Redding dies. That said I’ll be getting a custom die for this one.

    The only spec I remember giving Dave back in 2005 was the neck diameter. Everything else was his call. Maybe I can get him on the phone.............

    Also, I had a hunting rifle chambered with this reamer. A couple hundred rounds through it with no extraction issues.

    Regardless , you now have me wondering if I should get a new reamer......
     
    Last edited: Dec 21, 2018
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  5. dkhunt14

    dkhunt14

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    Maybe you got a small die and lucked out. When we used a .554 at .200 line reamer everybody had trouble. Usually started around the second or third firing. Matt
     
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  6. Ggmac

    Ggmac Gold $$ Contributor

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    I wouldn't change a thing , doing as good as you did . Not even the die . Just keep it simple and upgrade with newer bullet offerings .

    Like previous posted , 050 but I use the .064 number . Usually everyone trims the case to specs and I include the angle length in determining freebore .
     
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  7. INTJ

    INTJ Gold $$ Contributor

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    I guess it is only three tenths tighter than .555. I could just indicate in the barrel with a little runout and get the chamber bigger....... ;)

    I typically do not run hot loads, so that may have been part of it. I ran the 220s at 2740 fps and run the 168 TTSXs in the hunting rifle at 3000.

    Still, wouldn't a custom die solve any potential extraction issues?

    Also, I’m thinking I need a longer throat. I have a 1x9 twist barrel I am going to try as well as trying Sierra 200s (2231), Sierra 210s, Berger 200.20x, and Berger 215s. I am guessing a .250 throat?

    Then again, in 2006 I tried both 210 Berger’s and 210 SMKs, but the rifle like the 220s.

    BTW, this will be my bad weather rifle, a light gun. Bat B is on order. I have the Benchmark barrel, and will get one of Alex stocks.
     
  8. LA50SHOOTER

    LA50SHOOTER Gold $$ Contributor

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    One thing I noticed on the print, it's showing a 30 degree shoulder angle.
    Not saying it can't be made work but the 300 WSM has a 35 degree shoulder.

    I'm surprised that with as short of lead/throat that it has it shot 220 SMK's as good as it did.
     
  9. INTJ

    INTJ Gold $$ Contributor

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    I don’t think the shoulder is really 30 degrees. I don’t notice the shoulder angle changing after firing. I’ll take some pics tonight of new and fired cases. Also, when I measure the reamer from the end of the neck to the end of the cutting flutes, I get .307”. I am thinking the reamer drawing is off........
     
  10. Ringostar

    Ringostar

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    The print shows 35 degrees like it should. The .30 is not the shoulder angle.
     
  11. dkhunt14

    dkhunt14

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    Probably, a custom die would take care of it. I used the wrong word, instead of extraction, I should of said bolt click. The WSM is a great cartridge, very accurate. I broke 7 world records and 5 club records with it, including the 10 match heavy gun
    score record at Williamsport this year. Matt
     
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  12. INTJ

    INTJ Gold $$ Contributor

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    I hate that click. I just don’t remember having to fuss with it, but then again I am in the middle age of life......

    What bullets do you like for the 300 WSM?
     
  13. LA50SHOOTER

    LA50SHOOTER Gold $$ Contributor

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    - Okay Ringo, I see 35 back there at the rear, so what is the "30" ?
    PTG's prints leave something to be desired IMO and so did every reamer that I got from them as well.
     
  14. Ringostar

    Ringostar

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    I’m not sure what the .30 and .120 are referring to. If they were degrees, they should add up closer to 180 pending sidewall taper.
     
  15. dkhunt14

    dkhunt14

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    Maybe the radius at the junctions. It can never be zero because it needs radius on it. Matt
     

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