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Thread: .308-30XCB-2490fps-10 twist barrel.

  1. #1
    Boolit Master waco's Avatar
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    .308-30XCB-2490fps-10 twist barrel.

    Went out shooting yesterday with a new load for my factory 20" Rem700 .308 with a 1:10 twist barrel.
    I shot these relatively fast and the barrel got pretty hot. I THINK that's where the two flyers came from.
    Had a cold bore flyer as well. Pretty happy with the results other than the pesky flyers.
    10 shots at 100 yards. Prone off a bipod and a rear sand bag out of the bed of my truck.
    30 XCB bullet sized to .311" lubed with Lar's 2500+ with an overcoat of BLL.
    40gr of RX15 for a MV of 2489fps
    Last edited by waco; 04-15-2018 at 06:46 PM.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
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    Boolit Master waco's Avatar
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    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

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    Boolit Master waco's Avatar
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    Many thanks to Runfiverun, Geargnasher, and Btroj for all the help getting this far. Three class acts. I appreciate all the help guys. You are the best.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

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    Boolit Master waco's Avatar
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    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  5. #5
    Boolit Buddy Time Killer's Avatar
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    Nice Group. What was you lead Bh/mix. I have that same mold and am working up a load for my 308. Were they gas checked or plain base.

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    NICE!!!!! You can be proud of those all day, week and year. xcb is a cool looking boolit.

  7. #7
    Boolit Master waco's Avatar
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    TimeKiller.
    90/6/4
    Pb/Sb/Sn
    Yes gas check and water dropped. 22bhn give or take.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  8. #8
    Boolit Master waco's Avatar
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    Quote Originally Posted by kungfustyle View Post
    NICE!!!!! You can be proud of those all day, week and year. xcb is a cool looking boolit.
    Thank you.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  9. #9
    Boolit Master


    tomme boy's Avatar
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    You were jamming these in the throat right? Your barrel has that super long throat.

    Do you have any Federal brass? Or have you tried any yet?

  10. #10
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    Rcmaveric's Avatar
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    Outstandin job at shooting and reloading.

    Sent from my SM-G925T using Tapatalk
    "Speak softly and carry a big stick; you will go far."
    ~Theodore Roosevelt~

  11. #11
    Boolit Master waco's Avatar
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    Yes. These were jammed. I don’t have but a few pieces of Federal brass. I have 150 new pieces of Starline I’m going to try out.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

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    Waco you're getting there, but a few things concern me. Was your target backer board plumed vertically? I ask because a good number of your bullet holes look like they hit at an angle. It's either that or your bullets were yawing/not stabilized. Being that only seven bullets cut the main group hole, and most of those are on the outer edge of the that hole, why is the center gone? Did the seven cut the around it and it fell off? With three fliers you have some issues you need to address. It's either bullet casting, lube, not starting straight (which the holes showing the bullets were tipped/unless your target wasn't vertical, possibly bullets over spun. Did you shoot these where you shot your 500 yard target before? Have you tried these the XCB bullet at further then 100 yards?

    You're on the road so work out the fliers and put your target up straight!!!

  13. #13
    Boolit Master


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    I would be happy with a 2MOA cast bullet group so maybe it shows how inept I am as a cast bullet maker. But it would bother me to have two shots that far out of the group. The cold barrel shot would be discounted if it was repeatable and/or the first shot out of a clean barrel.

    It looks like 1MOA is possible with more tweaking and that is amazing!! I have accepted that if I want to shoot itty bitty groups at high velocity I use jacketed bullets. It makes me appreciate how much effort is required and the talent of those who can.
    Don Verna

    NRA Endowment Member

  14. #14
    Boolit Master waco's Avatar
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    Vince. The targets were stapled onto cardboard that was hanging from a sawhorse.
    We were shooting slightly downhill.
    Maybe that’s why some of the holes look off??
    Dunno.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

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    Quote Originally Posted by waco View Post
    Vince. The targets were stapled onto cardboard that was hanging from a sawhorse.
    We were shooting slightly downhill.
    Maybe that’s why some of the holes look off??
    Dunno.
    Don'tcha know you are suppose to bring a plum bob or level with ya when setting up a target??

  16. #16
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    HangFireW8's Avatar
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    Waco,

    Nice shooting, especially at that speed.

    Those flyers could be any number of things. I'll start by asking, what BHN, and what was the run-out on the ogive of that ammo?
    I give loading advice based on my actual results in factory rifles with standard chambers, twist rates and basic accurizing.
    My goals for using cast boolits are lots of good, cheap, and reasonably accurate shooting, while avoiding overly tedious loading processes.
    The BHN Deformation Formula, and why I don't use it.
    How to find and fix sizing die eccentricity problems.
    Do you trust your casting thermometer?
    A few musings.

  17. #17
    Boolit Master waco's Avatar
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    Around 24bhn. Less than .002” runout.
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  18. #18
    Boolit Master
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    Very good!

  19. #19
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    Yodogsandman's Avatar
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    Remarkable! Good job!
    A deplorable that votes!

  20. #20
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    tomme boy's Avatar
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    Is the Starline a little thicker in the neck than the Yugo brass you were using? Just wondering. That was why I asked about the Federal. I always had my best accuracy with Federal brass because of this. And it was really consistent in weight also.

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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