33 XC Build

Discussion in 'Big Stuff--7mm, 30 Cal, .338+' started by rpierce, Feb 12, 2020.

  1. rpierce

    rpierce Gold $$ Contributor

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    Well Ive finished my personal lightweight 33 XC. This is going to be my LONG range big game hunting rifle. Joel Russo sent me one of his Terminus Helios actions. I went through it and was very impressed with it. Ignition was very clean and timed up to a Triggertech diamond perfectly right out of the box. Zero cock on close. Action was extremely straight as well. Very smooth cycling 3 lug action. Great job Joel. I took it out last night and decided to do some base pressure testing with IMR 8133 and 300 gr bergers. Did one grain increments starting at 109 gr and went up to 118 gr. 118 gr was 3160 fps and still wasn't a warm load. Case web was a half thou bigger than 116 gr. I saw that there was a node between 115-116 gr. I loaded some up at 115.5 gr and shot a 3 shot group that measured .254" @ 100 and had a velocity of 3087 fps, SD of 3.9 fps, and ES of 8. 300 grain berger at .020 off the lands. After the barrel breaks in and velocity stabilizes I might try some tinkering in the upper 3100 fps range and see whats there. With my titanium cheytac brake on the recoil is very similar to my lighterweight 300 norma improved. Spotting hits isn't a problem. I could let my wife shoot this thing. Brass, dies and reamers are available through David Tubb - Superior Shooting Systems LLC

    The rifle has the following:
    Terminus Helios w DLC timed to a Triggertech Diamond
    Proof Research 30" 1.250 straight contour carbon barrel
    Titanium 5 port Magnum "Muscle" Brake, shaved 6 oz off steel version
    XLR folding 3.0 element magnesium chassis painted by my buddy Grant Gillespie at Viking Armament
    Modular Evolution Bipod
    Spuhr Mount
    Zero Compromise Optic 5-27 scope.

    Rifle is 14.5 lbs with optics and bipod attached.

    For comparison sake this rifle has the same amount of energy at 1400 yds as a 6.5 creedmoor with the muzzle pressed against the fur LOL.
    86276650_495780054443297_5132101746780274688_n - Copy.jpg 86458496_162552705198572_6894778753377894400_n.jpg 85063526_852833625187973_4017778812614868992_n - Copy.jpg 86489568_483396879238651_3961635116085673984_n.jpg load.jpg
     
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  2. rpierce

    rpierce Gold $$ Contributor

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    a couple more pics
    84696805_210046783455504_5659192197908529152_n - Copy.jpg 86307949_127277835251656_3567377330428968960_n.jpg 86355799_894043274362413_5027151321799589888_n.jpg 84850262_3534860616587898_7662584580800512000_n.jpg
     
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  3. bozo699

    bozo699 Gold $$ Contributor

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    That’s sweet!.... what did Tubbs base that case off of?
    Wayne
     
  4. birdog

    birdog DASHER DOME Gold $$ Contributor

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    WOW!!!
     
  5. PhilKeil

    PhilKeil Gold $$ Contributor

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  6. PhilKeil

    PhilKeil Gold $$ Contributor

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    It is based off a lengthened 338 Lapua
     
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  7. bozo699

    bozo699 Gold $$ Contributor

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    thank you.
    Wayne
     
  8. rpierce

    rpierce Gold $$ Contributor

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    Well I decided to try some VV N570 powder in it based on some recommendations from a few guys. WOW. Talk about bringing it to a new level of performance. At 3300 fps with a 300 gr berger there was only a 1/2-3/4 thou more case web expansion than at 3100 fps with IMR 8133 which was a very mild load. At 3300 fps the case web is still about .00125-.0015 smaller than the chamber. Ever so faint ejector mark. There really wasn't a flat spot in velocity till I got to the upper end. I didn't go higher since it was starting to not have much more room for powder. There wasn't a powder crunch but there wasn't much rattling around when Id shake it. I realize this is gonna kill barrel life but its a hunting rifle so even if I get 500 good rounds that will last me 20 years. Im building a much heavier one that will be a switch barrel setup for 33xc and 37xc. I won't be using fast loads in that one since its more or less just for plinking. Energy wise the 300 gr berger has 1500 ft lbs of energy at 2100 yds compared to my 300 norma improved having 1500 ft lbs at 1300 yds LOL. Even at 3300 fps I wouldn't have a problem letting my wife shoot this rifle. My Titanium Magnum 5 port "Muscle" brake kills the recoil as its originally designed for cheytacs etc.

    First target is 108-117 gr. The low right shot was the 108 gr charge which was also a clean barrel. The 2nd target is the same but with 118-121.5 added. After 117 gr the impacts went up higher on the target. 119.5-121.5 was the upper right cluster. Im pretty impressed w the overall group since I got off the rifle between each shot and went and loaded another round in the shop. Shot off a modular evolution bipod and game changer rear bag. Im gonna stretch it out and fine tune a load once we get a little bit warmer weather.
    N570.jpg 108-117.jpg 118-121.5.jpg
     
  9. 69mach

    69mach Silver $$ Contributor

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    Where on tubbs website does he list reamers?
     
  10. rpierce

    rpierce Gold $$ Contributor

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  11. Terry

    Terry Gold $$ Contributor

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    I bought mine from Manson.
     
  12. Earnhardt

    Earnhardt Gold $$ Contributor

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    Great thread!

    Selling the Titanium Brakes in .338 yet?
     
  13. simo hayha

    simo hayha

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    Dear god. I got to go take a cold shower now....
     
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  14. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    I saw your post on Facebook. Man, that is smokin.... Is this the new Vit powder that is temp stable?
     
  15. rpierce

    rpierce Gold $$ Contributor

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    My magnum 5 port is available in titanium. The self timers could be opened up by your gunsmith.
     
  16. rpierce

    rpierce Gold $$ Contributor

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    N570 is extremely temp stable.
     

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