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7mm-08 Hornady 139 interlock C.O.L.

Discussion in 'Handloading and Reloading' started by JackSprat, Jan 9, 2016.

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  1. JackSprat

    JackSprat Member

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    Hello,I'm new here.I've hunted all my life,but only been reloading for a couple years,.I reload for most of my centerfires..I never owned a 7mm-08 till about a week ago.I ordered brass bullets,and dies.The bullets are blems from Midway,but I'm sure they are139gr flat based Interlocks..my order came in,and I figured I'd load a few..Lee's Modern reloading states 2.8" as min. length for 139s,but is very unspecific as to what particular bullet..When my new bullets are seated at 2.8" the crimp groove sticks up past the brass..I did bump a couple down to the cannelure,and the load is not compressed,but I'm a little worried about pressure...I know that most 7mm-08 shooters reload,so I figure this would be a good place for advice..thanks
     
  2. climbnjump

    climbnjump Member

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    Well, if they ARE 139 gr flat base Interlocks, the COL listed in the Hornady manual is 2.775".

    If you are working up this load from below the max charge for the powder you have chosen, you don't need to worry about pressure increases from seating a few thousandths deeper if you really want the top of the case to line up with the cannelure.

    You didn't say if you are planning on crimping, but that isn't necessary as proper neck tension is all that is needed. So if you are not crimping, there is nothing wrong with leaving the cannelure above the top of the brass if you'd rather not seat the bullets deeper.
     
    Last edited: Jan 9, 2016
  3. JackSprat

    JackSprat Member

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    Thanks that explains a lot.
     
  4. JimKirk

    JimKirk Member

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    Hornady #9 lists both 139 gr Interlock BTSP and flat base SP @ C.O.L 2.775" if that helps...
     
  5. theleo

    theleo Member

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    Don't sweat the cannelure. My normal practice is to load to the magazine length to start with then start playing with seating depth when the rifle shows a preference for a bullet powder combo. There shouldn't be any rifles out there that a 139 gr Interlock would seat down past the neck to function.
     
  6. JackSprat

    JackSprat Member

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    Lots of good info here on this forum..thanks everyone
     
  7. GooseGestapo

    GooseGestapo Member

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    Also be aware that they may be blems due to misplaced cannelure.
    IOW, ignore the cannelure.

    I bought a quantity of the 139gr .284" Boat tail blems several years ago. Love them!
    I seat to 2.825" as this puts them touching the grooves on my Rem. Mod-7. This is where I see best accuracy. Fits magazine as well.
    Favorite powder is Reloader17. I see 3,000 fps from 20" barrel. Published max load.
    Rifle isn't a tack driver, but punches far above its weight.
    Best accuracy has been with IMR4350; however H4350 and RL17 aren't far behind.

    IMR4064 nor H380 gave nearly the speed nor accuracy for me.
     
  8. JackSprat

    JackSprat Member

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    I only ordered 1 box ,but after seeing them, I wish I would have ordered more...I hope I have better luck than you with IMR 4064 than you,because I have about a pound and a half that's not doing me any good.I'll at least give it a shot...
     
  9. gamestalker

    gamestalker member

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    I haven't referenced a published OAL for any cartridge since shortly after taking up reloading several decades ago.

    Just seat them where they shoot most accurately, and will fit the magazine. This is one of the perks of reloading, that being, we have the ability to tailor our loads to what shoots best from that firearm.

    The factory loaded stuff has to be built so they will fit and function in any firearm, we don't.

    GS
     
  10. Paladin7

    Paladin7 Member

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    I load for a Remington 700 in 7mm-08...

    I wouldn't worry about the cannelures esp. on blem bullets... I would however suggest measuring and sorting your bullets by size...MEASURE OFF THE BULLET OGIVE, NOT the tip. Hornady makes a tool that clips onto your Caliper for this purpose. When you adjust your bullet seater, do it for each lot of bullets that are the same size. Size will vary.

    Find out where your bullets hit the lands in your barrel (there are many ways to do this), then back off .020 to .030 off the lands and test your loads. You don't want your bullets touching the lands, you want to find the position off the lands that gives you the best accuracy.

    Also, I would highly recommend you buy the current Sierra and Hornady Manuals and rely on them vs the Lee Manual you already have. The Sierra Manual is the KING in terms of data, and the Hornady Manual is a good one esp when you are loading their bullets.

    Hope this helps...and stay safe...
     
  11. Bull Nutria

    Bull Nutria Member

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    4064 gave better accuracy in my TC venture 7mm08, Varget was close IMR 4350 was third and H380 was fourth! I like the Rem 140g corelocts but they are hard to find and pricey. i have 139g hornadys also. you will like the 7mm 08.

    in my accuracy testing flatbase bullets were more accurate than boattails in my rifle at 100yds. depending on how far you are shooting you may want to try some boattails also. i did not load a max load with the 4064. i seat to the length of my magazine.

    like Goose said they are a hard hitting light recoiling accurate round!!

    Bull
     
    Last edited: Jan 11, 2016
  12. gamestalker

    gamestalker member

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    As long as you are doing a proper work up, you can seat them any where from slightly jammed into the lands, to off the lands, it's all about finding what shoots the most accurately.

    Just know that as you approach close proximity to the lands, pressures can increase. That said, since pressures can increase when close too or jammed into the lands, I always start my load development with the bullets jammed .010" into the lands. By doing it this way, I don't have to adjust / decrease the powder charge at all while decreasing oal away from the lands. This also helps reduce the amount of components needed / used during the development process, and the development process goes a bit quicker too.

    BTW, I've found that almost every rifle I've ever loaded for, has an accuracy node with the bullet jammed or touching the lands. You do lose a little bit of velocity though, but I'll trade a little velocity, for superior accuracy any day of the week.

    GS
     
  13. JackSprat

    JackSprat Member

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    Thanks for all the good information everyone...I loaded a few more yesterday,and seated them at 2.775,and the bottom of the cannelure was just about at the top of the brass..I'm using 308 brass,..I was itching to shoot it but it was cold,so rather than go down to the bottom were I have a table, I just drew about an inch dot on cardboard box,and set it out in the back field,and shot from the kitchen window,and was pleasantly surprised..The gun came with an old style Bushnell Banner 4-12×40 with adjustable objective that I figured I would save for a rimfire,and replace it with a Redfield Revolution that I had on a gun I sold,and was shocked that it was too short bodied for the Savage Axis with the two piece base..I had to put the Bushnell back on.I did notice that it was at least a Japanese scope rather than Chineese..I was only shooting about 50 yards,just to be sure I'd be on the box,and I was surprised that they were all just a hair to the right,and from the 4 I shot,2 were touching,and the wasn't much space between any of them..I think that it shows promise of being a pretty decent shooter,and I even think the scope might be decent...I'll take it down to the bottom,and expeirement with it when I get the chance,but it at least looks promising..
     
  14. azar

    azar Member

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    +1

    This is the same method I use for the same reasons, with one exception. I start at 0.010" off the lands rather than into them. Since my primary purpose is creating the most accurate hunting loads I don't want to deal with the chance of the bullet staying stuck in the rifling when being un-chambered and spilling powder in the action. It simplifies things if you only have one direction to move the bullet when testing for optimal OAL.
     
  15. gamestalker

    gamestalker member

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    Never had one pull out, but yes, .010" OTL is fine for a starting point to work back from.

    GS
     
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