A little 7mm practical help

Discussion in 'Reloading' started by .284, Sep 26, 2012.

  1. .284

    .284 Well-Known Member

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    Hey guys, I'm thinking of ordering a 7mm practical reamer. I have a custom sako 75 in 7 rem mag that has a mag length of 3.728 inch. Id like to shoot the 180 bergers but would like to know if I order a reamer for those bergers to fit my mag length if I will still be on the bearing surface in the case necks when I seat them to overall length of about 3.7 inches and not into the ogive.

    I know there's a few guys on here that shoot the practical and I was hoping someone might be able to seat a 180 Berger in a fire formed case to a overall length of 3.7 and let me know how it looks. Otherwise I'll have to look at single loading but sometimes it can be a pain to eject a loaded round.

    Thanks
     
  2. proload

    proload Well-Known Member

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    I'd suggest that you speak to Nathan Foster. He's incredibly switched on a build a fair number of 7mm Practicals.

    Have a look at his website. He's very helpful. This page may help.

    The 7mm Practical. A Practical Magnum.

    Hope this helps.

    Cheers
     

  3. Joe King

    Joe King Well-Known Member

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    After looking it up I have to ask. Why? what do you hope to get in real world gains?
    Not being a smart ass mind you, just seems to me that there isn't enough gain in powder capacity to make it with worth the trouble. Just to have something nobody else has? which to me is reason enough,I've thought about it though, I've often mulled 7mm RM AI but never enough to look into it.
     
  4. proload

    proload Well-Known Member

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    I would love to have one ... and plan to build one in the next year or two ... It's a great long range caliber... You almost get the power of a 7mm RUM without having to replace your barrel every 400-500 rounds, and without the freebore issues of the RUM.

    Why wouldn't you want one?

    Just my 2c.
     
  5. Joe King

    Joe King Well-Known Member

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    not much info on it, so I was thinkin of it in relation to the 300win vs 30-338, pretty close in performance
     
  6. .284

    .284 Well-Known Member

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    I have an email off to Nathan as well just thought I'd look here for some info as well.

    As to why would I want one - well I just can't see why not. I,ll be almost through my 7 mag barrel by the time I got a reamer built and thought it would be a great time to fireform some brass and check the round out.

    If it were all about saving money and not having any fun we'd all shoot a 30-30 or 30-06. I like the idea of getting 180 Bergers north of 3000 and maybe even 3100. The reamer is cheap and if it worked I think it would be real interesting to try the 195 Berger out in. Assuming the 195 is a success.
     
  7. Broz

    Broz Well-Known Member

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    I have built several of the 7mm-300 win versions of this off my own reamer. I feel this is a very efficent sized case for a 7mm and you will get very good velocity without suffering the increased throat erosion that comes with larger cases. The accuracy of these chamberings in Hart 9 twist barrels will impress even the worst of the naysayers with a 180 Berger. The first one I did is approaching 1000 rounds now and still put 4 out of 5 in a skoal can at 700 yards a while back. H-1000 is my choice of powder. Another huge plus for this chambering is brass selection. I have some Lapua stashed but we also get great results from RWS brass which is some really tough stuff and it is always available unlike some of the other larger 7mm brass. Fewer cases have won more matches over the years than a 300 win case. I happen to believe that was not just by chance. Here is how I see it. If you are a 7mm fan, the 7mm Practical / 7mm-300 is a chambering that is very easy to get a love affair going with. lightbulb

    Jeff
     
  8. .284

    .284 Well-Known Member

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    Jeff, thanks for the input. My only concern with running this case in my Sako mag is the length of the mag. I don't currently have any 300 win mag brass to compare with but do you think it might be possible to seat a 180 Berger to an oal of about 3.6 inches and still have the bearing surface of the bullet in the neck of the case? Or do you foresee any issues with this oal? There's not a lot of info on this round to sort through.
    Thanks
    .284
     
  9. Broz

    Broz Well-Known Member

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    I don't have your reamer specs so I don't know. All the ones I built were off of Rem 700 and Wby actions and we had no issues at all with the bullets seated way out there. I would not worry about it. I never load a mag box anyway. I get along single feeding rifles just fine. The LRKM Shawn is building me will be my first actual single shot though. Can't wait.

    Jeff
     
  10. lyotehunter

    lyotehunter Active Member

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    after shooting several I built one of my own it seems like a very efficient load (like the 308) I used nosler 300.win. brass and necked them down.not as much powder of recoil as the 7mm mag. but six different guns shoot half min. or better.just not much reloading data