7mm Rem. Mag. bullets and barrels?

This is a discussion on 7mm Rem. Mag. bullets and barrels? within the Rifles forums, part of the Sniping Related category; I am going to buy a new barrel on my sako 7mm Rem. Mag. from http://www.shilen.com/ and i wanted to know if anybody could point ...

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  1. #1
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    7mm Rem. Mag. bullets and barrels?

    I am going to buy a new barrel on my sako 7mm Rem. Mag. from http://www.shilen.com/ and i wanted to know if anybody could point out a homepage or post it here with all information about all 7mm Rem. Mag., grains and loding information, and how much the twist should be for each grain and how long a barrels should be.
    Hegat Hegatsson

  2. #2
    Senior Member sw_hunter's Avatar
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    hello and welcome Hegeat

    Why if you dont mind me asking are you getting a new barrel? This it a used rifle? are you going to be hunting or just target shooting with this rifle? there is a ton of info on this forum and site but the best advise is use the search option at the top of the screen there are numerous posts about the 7mm rem mag. but here are a few links

    Handloads
    http://www.snipercentral.com/forums/vie ... mm+rem+mag

    Barrel twist
    http://www.riflebarrels.com/faq_lilja_rifle_barrels.htm

    P.S. as far as barrel lengths, I like my 7 mags with 26inch barrels. but thats just my 2 cents 8)
    Roses are red, my locktite is blue, without any ammo, what am I to do?


  3. #3
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    The barrel is damaged, and i will be using the rifle mostly for hunting. What is difference of a 26inch barrel or aš 30inch barrell, how dose it affect the bullet?
    Hegat Hegatsson

  4. #4
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    If you are going to use it mainly for hunting, 30" is too darn long to haul through the bush. 26" is about right to maximize powder burn and still be short enough to maneuver through the bush.

    The longer barrel is almost certainly good for about 25-40 fps per barrel inch beyond the 26 you are talking about.

    JeffVN
    1976-1980
    2/2 Echo, 2/2 STA, 3/9 STA, SCAMP

  5. #5
    Member Hohlspitz's Avatar
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    7mmRM

    hegat,

    I suggest that you get at least a couple of good reloading manuals and study them with regard to your starting to reload for the 7mm Rem. Mag. They don't have to be brand new since the 7mm RM has been around for a while already and there will be plenty of current information in most of the slightly older manuals. There is also a ton of information available through the powder manufacturer's websites.

    http://sst.benchrest.com/#powdersandloaddata

    Then use a search engine to locate other sites that have lists of load data by caliber.

    Generally the most common twist rate is 1:9" for the 7mm RM although you can get a specialized twist if, say you only want to shoot the shorter, lighter varmint bullets instead of shooting the longer, heavier target or hunting bullets. Most shooters just use the 1:9" twist.

    http://sst.benchrest.com/shilentwist.html

    Get some manuals, do some reading and searching then load and go shooting.

    Good Luck!

  6. #6
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    Jeffvn

    The longer the barrel is it slows the bullet down, but will the rifle be more accurate?

    Hohlspitz

    Do you know of any good online reloding manuals for 7mm RM. and a list of all type“s of bullets 7mm RM(grains)?
    Hegat Hegatsson

  7. #7
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    hegat - the longer the barrel the faster the bullet will go (with a .308, a barrel that is an inch longer than 18" will run roughly 25-40 fps faster with the same load than a shorter barrel). Same chamber pressure, but it gets to push on the bullet longer.

    That is why most Palma shooters use a 28-30" barrel (.308 using 155 SMK or similar bullet) and most pure F-Class long range rigs run at least a 28 inche barrel.

    JeffVN
    1976-1980
    2/2 Echo, 2/2 STA, 3/9 STA, SCAMP

  8. #8
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    Dose more speed mean more accuracy in general?
    Hegat Hegatsson

  9. #9
    Member Hohlspitz's Avatar
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    7mm RM reloading/ballistics

    hegat,

    With all due respect, I'm not sure if there is a language, age or knowledge problem here but there appears to be some confusion. So here is some information put simply:

    There is a tremendous amount of reloading information online, I gave you a link to start you out. But you need to put the effort into the search as I am not going to print out all of the sites contained in that link as there are literally hundreds of pages. All you need to do is select a search engine and type in "reload 7mm Remington Magnum" without the quotes.

    A good data base for reloading is available from:

    www.reloadersnest.com

    Here is a good set of articles for beginners that address some of the aspects of internal ballistics:

    http://www.mamut.com/homepages/Norway/3 ... s/main.htm

    http://www.shootingsoftware.com/reloadingtips.htm

    http://www.shootingsoftware.com/tech.htm

    While I don't agree with everything this man writes, this article is a basic introduction to rifle barrels:

    http://www.chuckhawks.com/rifle_barrel.htm



    Longer barrels allow more time for the plasma (hot gases) to act against the base of the bullet, thereby developing more velocity. There is a point of diminishing returns but that will vary depending on the case volume, surface area of the lands, bullet weight and burning rate of the powder used. There are more variables but that's the short list.

    Greater velocity alone does not equate to better accuracy in all cases. Most of us look for efficiency and accuracy rather than just velocity. It depends on the rifle, loads and the shooter as to how much accuracy can be derived from a cartridge or rifle. We spend a good deal of time and money testing various loads for accuracy. Each rifle needs to be tested as an individual for what it likes as loads for accuracy. We can't just tell you that a particular load is the most accurate and have that be true for your barrel and rifle.

    This is an area that is fascinating for most of us and requires more reading and studying that a short answer given in a forum allows.

  10. #10
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    Thank“s for the help.
    Hegat Hegatsson

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