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Thread: Forming 264 Win Mags from 7mm Rem Mags

  1. #21
    Boolit Mold
    Join Date
    Mar 2016
    Posts
    16
    7mm Rem Mag to .264 Winnie- No problems that I have encountered, I personally like to graphite my necks inside and out. I also use Imperial sizing die wax on the case body. Use your friends rifle as a test platform for the resized rounds. Just a slight resistance on the bolt when you close it on the resized round.
    Leadman is very correct. The Factory ammo uses a 2 diameter J word bullet. If you use regular .264 Bullets , you will be seating them quite deep compared to the factory round.
    I have been using surplus H870 and a 140 gr. Accubond in an early Model 700 with a stainless barrel . I found the bullet was cutting into my case space, reducing my powder capacity. I had my rifle throated by a local smith to get the bullet further out of the case. The .264 really spins coyotes good......

  2. #22
    Boolit Master
    swheeler's Avatar
    Join Date
    Mar 2005
    Location
    Montana
    Posts
    4,470
    Quote Originally Posted by runfiverun View Post
    Remington got the 7mm over on Winchester in this case.

    Winchester spent quite some time developing the 6.5 round but someone found some of the cases during the development stage and Remington took advantage of it and just necked the cases up to 7mm and introduced their round.
    the 6.5 was pretty much dead in the water from minute one at that point.
    I think this is just another "old wives tale" because Winchester introduced the 264 Win Mag in 1958 and rifles and ammo were readily available, then 4 years later in 1962 Remington introduced the 7mm Rem Mag. They did indeed just neck up one caliber, it caught on because of better bullet selection and was deemed not such a "barrel burner" in the gun rags of the time. I shoot both cartridges and prefer the 264, loaded to it's full potential with 140 bullet it is capable of taking anything North America offers.
    Last edited by swheeler; 04-14-2017 at 06:32 PM.
    Hell, I was there!

  3. #23
    Boolit Man
    Join Date
    Apr 2015
    Location
    South Waikato, New Zealand
    Posts
    111
    I have a Ruger 77 in .264 Win fitted with a Douglass barrel it came with 80 loaded rounds in 7mm Rem cases it shoots 140 grain Hornady interlocks into nice little groups
    it also came with 100 new Winchester .264 brass I am still using the 7mm brass have not lost any yet so it is not a problem using 7mm Rem cases
    I picked up a few 7mm Rem cases to try necking them down one pass through the FL die and job done just as easy as sizing a fired case

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check