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Thread: Do I need to re-work this reamer?

  1. #1
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    Do I need to re-work this reamer?

    The reamer pictured is a PTG .308 win match. I've had my mic all over it. I'm chambering Krieger 17 twister in HBR contour.

    I was told there needs to be no, or little freebore. It appears this is the case.

    Where the neck stops, and freebore part of the reamer starts, the reamer is .308. It starts to taper immediately (less than .010) to .300. over a .378 long cutting surface.

    Alternately, the 300 mag, and ultr mag above have a longer .308 cutting edge, maybe .100

    My 308 reamer should work with the light Berger bullets?
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  2. #2
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    Just guessing here, but it sounds like you don't have much if any freebore. That's OK for lightweight bullets or even heavier bullets that are seated deep in the case to where you only have the ogive sticking out the end of the case. You could have a problem with factory ammo in the 150 grain bullet size and up although I doubt you'll be shooting anything that heavy in a 17 twist. If you have a throating reamer you can always push the throat out a little bit if necessary. But it sounds like about what you want for 120-135 gr. bullets.

  3. #3
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    PT&G 308 reamers

    Dave Kiff list three primary 308 reamers in his chamber drawing book.

    1. 308 Winchester (for hunting)

    2. 308 Billingsly Palma

    3. 308 1995 Palma

    The throats are different in all three rounds.

    Rustystud

  4. #4
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    How about a print of this reamer?

    Why not ask the maker for a print? Then you wouldn't have to guess.

  5. #5
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    Quote Originally Posted by Bnhpr View Post
    I've had my mic all over it.
    You might want to avoid doing that, especially if your micrometer has carbide faces. Your reamer will be happier (therefore, you will be much happier while cutting with it) if you don't direct-measure it's honed cutting edges.

    -Dave-

  6. #6
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    Dave is 100% right

    Quote Originally Posted by Dave Short View Post
    You might want to avoid doing that, especially if your micrometer has carbide faces. Your reamer will be happier (therefore, you will be much happier while cutting with it) if you don't direct-measure it's honed cutting edges.

    -Dave-
    ,,,,,,,,,,,,,,,,,

    A print of a drawing and the real thing are two completely different things altogether.
    Spare your mic. and make yourself a tool I've described one or two post earlier especially the bushing/stem and it will tell you all what do you want to know about the length of your true freebore.

    Shoot well
    Peter

  7. #7
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    Quote Originally Posted by henrya View Post
    Why not ask the maker for a print? Then you wouldn't have to guess.
    I will request one.

    I was quite gentle with the reamer, but I can see your point. Although it's not a crystal glass for pete's sake, it's tool steel!

    Ben

  8. #8
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    Ben, if you're unable to obtain the freebore info from PTG, you can simply take an old piece of a .30 cal barrel and put in the throat, neck and a bit of the body length...then measure where the lands are with a dummy case/bullet setup.

    I'm not sure if you've decided to go with a full length 308W case or if you're going to simply chamber it 'short' and form cases? Is the reamer dimensioned at the rear for Lapua brass? Winchester stuff?

    Whatever the case, I would have serious reservations about building a competitive .30 cal. Hunter rifle using a reamer that accomodates unturned necks and with a freebore diameter/length that is not specific to the particular style of bullet you intend to work with. This approach will limit the success of the project from the start and will ultimately prove to be not only frustrating but will never give you the accuracy you need in todays world of Hunter Benchrest competition. The 'old days' of being competitive with .250 groups are long, long gone.

    Not trying to be harsh...just honest. -Al

  9. #9
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    Quote Originally Posted by Al Nyhus View Post
    Ben, if you're unable to obtain the freebore info from PTG, you can simply take an old piece of a .30 cal barrel and put in the throat, neck and a bit of the body length...then measure where the lands are with a dummy case/bullet setup.

    I'm not sure if you've decided to go with a full length 308W case or if you're going to simply chamber it 'short' and form cases? Is the reamer dimensioned at the rear for Lapua brass? Winchester stuff?

    Whatever the case, I would have serious reservations about building a competitive .30 cal. Hunter rifle using a reamer that accomodates unturned necks and with a freebore diameter/length that is not specific to the particular style of bullet you intend to work with. This approach will limit the success of the project from the start and will ultimately prove to be not only frustrating but will never give you the accuracy you need in todays world of Hunter Benchrest competition. The 'old days' of being competitive with .250 groups are long, long gone.

    Not trying to be harsh...just honest. -Al
    Thanks Al,

    Freebore seems to be .077"

    PTG sent me a drawing, see attached.
    Attached Files Attached Files

  10. #10
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    looks pretty standard to me

    That reamer looks pretty much for shooting bullets normally used in a cross the course rifle (168s or heavier). I think its not right for your purpose.

    I suggest you ask Al Nyhus and/or Pete Wass for suggestions as to the dimensions for your re-grind of this reamer to suit the particular bullet you want to use. Nothing like asking someone who's been down the road a few times.

  11. #11
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    Ben;
    I see the freebore on the reamer print as .077 as well.What needs to be remembered is the linear tolerances on most reamers is +/-.005 so a .072-.082 reamer could be accepted. Depending on the bullet weight and form this could be quite a lot.

    Mike Swartz

  12. #12
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    I'm ordering another reamer with no freebore, and a .334 neck, under recommendation of a known HBR competitor.

    Ben

  13. #13
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    Quote Originally Posted by Bnhpr View Post
    I'm ordering another reamer with no freebore, and a .334 neck, under recommendation of a known HBR competitor.Ben
    Ben, you'll be happy you went this way. As we've discussed before, chambering a 308W .165 'short' results in a very good case for Hunter Benchrest competion that works with a bunch of good powders and loves the bullets made on the 1.00" jackets (typically the 118-125 range). Assuming a reasonable 'back end' dimension on the 308W reamer, you'll be able to shorten existing 308W sizing and seating dies for a simple setup.

    Keep us up to date on how your project goes.

    Good shootin'. -Al

  14. #14
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    Quote Originally Posted by Al Nyhus View Post
    Ben, you'll be happy you went this way. As we've discussed before, chambering a 308W .165 'short' results in a very good case for Hunter Benchrest competion that works with a bunch of good powders and loves the bullets made on the 1.00" jackets (typically the 118-125 range). Assuming a reasonable 'back end' dimension on the 308W reamer, you'll be able to shorten existing 308W sizing and seating dies for a simple setup.

    Keep us up to date on how your project goes.

    Good shootin'. -Al
    Al,

    I bought a Mcmillan edge HBR stock, and was wondering how to inlet the magazine.

    My action is a 700 bdl, and has the floor plate.

    My question is, should I machine out the stock for a blind mag? or use the floor plate?

    If I go the blind option, can I use the spring/box and follower, and just get a separate trigger guard?

  15. #15
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    Ben, do not use the BDL bottom metal...an ADL trigger guard is what you'll want to use.

    As for the magazine inlet..since the IBS doesn't mandate that the magazine be functional (able to cycle cartridges), what most people do is just inlet a small magazine cut (long enough to hold whatever cartridge the gun is chambered for) that is deep enough to hold 1 or 2 cases. Ditch the metal mag. box..just get a Davidson single shot adapter and glue a piece of foam to it that rests on the bottom of the mag well. This way, it 'floats' and is moveable when pushed from the top, thereby conforming to all the rules. Getting rid of the sheet metal box and spring/follower assy. does good things for the bedding.

    The NBRSA doesn't require a mag. inlet at all..and the single shot follower can be glued to the stock...it just can't be glued to the action, effectively making it into a single shot.

    Hope this helps. -Al

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