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Thread: .308 Win, 30XCB, 17 twist.

  1. #1
    Boolit Master
    oldblinddog's Avatar
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    .308 Win, 30XCB, 17 twist.

    Bullets were cast from a mix of Rotometals hardball and 16-1 that results in a ratio of ~94.6/2.7/2.7. They were air cooled and then aged about 3 weeks prior to sizing to 0.310” and loading. Lube is Carnauba Red 2700+. They were not sorted in any way.
    The first shot flyer in the first pic is after wiping the bore with Hoppes #9 the night before. All shots are listed in order of firing.
    Click image for larger version. 

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    In this last pic, the two shots to the upper right were shots 2 & 3 of the string and were my fault because I moved the rifle in the rest away from where it should have been placed. There is no data on this string also, but I think the first two indicate that it is a pretty consistent load. The Chrony evidently didn’t like where the bullet was going through the screens. The load is slightly compressed, coming halfway up the case neck. As before, I chronograph at the 50 yard line at this range because of ease of use. Not much should be inferred from these groups other than that they are consistent.
    Last edited by oldblinddog; 04-28-2018 at 10:43 PM.
    USMC 6638

  2. #2
    Boolit Grand Master Tatume's Avatar
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    Very good. It appears that you have a consistent sub-two MOA gun, which will put venison in the freezer at any range I would take the shot.

  3. #3
    Boolit Master
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    I received a supply of Accurate 4350 yesterday and proceeded to load test rounds. Everything is the same as above with the exception of the powder which is Larry’s load of 47.0 grains.

    I had several bullets go out of the group. One was my fault. Three others are unexplainable other than to say that more rigorous culling may have prevented it. That left 12 shots in a group of about 1 1/2 inches. The Chrony data is from the last ten. Both the high and the low velocity shots are in the main group.
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    USMC 6638

  4. #4
    Boolit Grand Master


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    I see the AA4350 loads were tested at 100 yards vs the 50 yards for the RL17. It was 90 degrees with the AA4350 test; was that a great difference from the RL17? Also the ES for the AA4350 was almost 3 times as large as what I get? Could be just that your rifle doesn't like AA4350, could be something else. I suggest a side by side comparison of the two loads at 100 yards. That might tell the story. It's instances like this that definitely keep the game interesting. You're doing very good.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  5. #5
    Boolit Master
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    The temperature difference was likely about 30* (+/-) between the two. The biggest reason I went to the 100 yd. line is that I wanted to take advantage of the no wind conditions which are unusual in North Texas. The winds on the above RL22 tests were 17-23 mph with gusts above that.

    I’ve noticed that changing seating depth 0.050” will change the velocity by 30-40 fps with no other changes. I saw that on two “fouling” rounds at the beginning of this test.

    I believe that I need to go up on the charge as I’m not getting a complete seal at 47.0 grs. of the A4350. I will re-shoot and post the results. Same with the RL17. Click image for larger version. 

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    The 47.0 RL22 load at 2.680” c.o.a.l. and fired in my 1-12 x 24” sporter weight Douglas barrel with a saami spec chamber gave an average of 2391 fps, es of 51.77 and sd of 15.55. Group was 2 1/2 inches.

    The 2.760” and 2.680” c.o.a.l. of each load is that determined by allowing the chamber to determine length. In each the bullet is touching the lands without being “stuck” in the chamber.
    Last edited by oldblinddog; 04-29-2018 at 11:35 AM. Reason: Added photo
    USMC 6638

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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