Quarter bore and 6.5mm wildcat ???s

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by RedAllison, Oct 24, 2004.

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  1. RedAllison

    RedAllison Member

    Oct 23, 2004
    I have the same condition that I suspect everyone else here has, that is that I cant seem to amass enough rifles in my safe. I am curious about possibly having a custom built in a smaller bore VERY fast round for "farts n giggles" (aint that all the reason we need to get another gun?).

    I absolutely love the .257 Wby Mag but I like something different and have always been of the type that "if 2 aspirins are good then 4 are 2ce as good"! So I wonder about having a turbocharged quarterbore or possibly even a 264 pill launcher. I know from personal experience that the Lazzeroni Scramjet (.257) isnt as fast as the Warbird or the Firebird yet they all three share the same case (essentially a straightwalled .416 Rigby). That tells me that it is overbore. Would a 7STW case or an opened up 300 Wby case etc push either a .257 or .264 100+grain pill into the 4k fps realm? What about gettin a .243 85-100 grain Xbullet into that realm as well?

    Speed kills and I have NEVER killed anything to dead,
  2. fjlee

    fjlee New Member

    Aug 5, 2004
    Several years ago, probably in Shooting Times magazine, possibly Guns & Ammo.........one of the magazines' regular writers did article on a .257 Weatherby that he had built. I think the author was Rick Jamison, not sure. Anyway, this particular rifle was built using "gain-twist" rifling. It was a delicious article.....just almost too good to be true, in terms of the velocity and grouping ability he got. The velocity was absolutely amazing, for the amount of powder burnt, and the barrel length.

    I wish I knew of the exact source of that article, cuz I have often thought of it since reading it. I know when I read it, I thought to myself "If this rifle was for sale, I would buy it this second!"

    Maybe one of our members can post details about the source of the article.

    Lee Carkenord
  3. marlow 243

    marlow 243 Well-Known Member

    May 18, 2003
    i read in a shooting times artic.about a 25 cal. hot tommali it was + 4000 may want to check it out

    DANTEC Well-Known Member

    Jul 6, 2002
    I use and design a 6.5/300 Yuma that a 264 win body in a 300 win mag to create a long neck case

    with tight base and parallel throat that allow to reach 3350 fps with a 139/142 match bullet in a 30 inch barrel with no case vailability problem ( 300 win mag ) and good case ( any maker make 300 win mag ) neck is in 0.297 witch allow neck turning to get clearance

    accuracy is very good at 1200 yards

    good shooting

  5. littledevil2873

    littledevil2873 Well-Known Member

    Oct 27, 2004
    Been looking at a 6.5 STW myself. The data i've found so far shows a 140 gr. at about 3400 ft.
  6. jb1000br

    jb1000br Well-Known Member

    Jul 8, 2003
    that would be the 257STW--go for it--barrelmakers are making new barrels everyday [​IMG]
  7. Mysticplayer

    Mysticplayer Well-Known Member

    Jul 27, 2001
    Have a visit to accuratereloading.com. They have very fun fast projects.

    An STW or Ultra mag case and long enough barrel will certainly take the light pills to 4K. How accurately? who knows but it will get there in a hurry.

    Been playing with a 6.5-06 and 140gr SST bullets. Only going 2975fps but LR performance is great. Take that same bullet and go 3200 to 3400fps and you are having some fun. Use a 1 in 9 twist and I am pretty sure that bullet will handle the trip.

    Which brand of barrel are you planning on using? We should all buy some shares in that company :)

  8. Shawn Carlock

    Shawn Carlock Sponsor

    Jun 11, 2007
    I built a 6.5 STW for a client. It was an interesting round. I believe he is getting 3500 fps out of a 30" tube with 140 grain bullets. The 100 gr @ 4000 should be in your grasp. Tthe 6.5 STW is an easy brass build from 7 STW. I would build a 6.5 vs a .257 just based on bullet selecton. By the way I feel your pain of a gun safe that is not full.

  9. Mikecr

    Mikecr Well-Known Member

    Aug 10, 2003
    Just so ya know; the Scramjet case is completely different than the firebird/warbird case. The FB/WB case has 124grH2O capacity. The SJ has 95grH2O cap. Neither are based on, or derived from, a 416 case.
    Given this, You'll gain nothing over the Scramjet using STW/300WBy cases, as they both have less capacity than the SJ.

    With plenty of barrel, you could push a 90-100gr .257 bullet at ~3850, near max pressure. This with any case > 85gr cap. Beyond that, with light bullets anyway, there are no further gains with additional powder in this bore. Just heat and recoil.
    With heavier bullets the extra capacity helps, but velocity drops.
  10. Guest

    Guest Guest

    Try the good old obsolete 6.5 Remington Mag
    it will fool you.
    Remington just screwed up with the short barrels and killed the cartrige with it
    and now they are doing the same thing again
    with all these new short mags coming out.
    I built one with 26" barrel and chronagraphed 100 grain ballistic tips at
    3700 FPS 60 grains of accurate 3100.
    it out shoots my 264 mag and my 6.5-06 both
    when it comes to FPS.