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    • #30073
      Scharfschuetze
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      Larry and I had a great day at the range today. We shot several rifles, but by far the most interesting was Larry’s rifle built by Goodsteel specifically for high velocity cast bullets.

      The rifle is based on a Model 98 Mauser and has a 31″ barrel with a 1 in 16″ 3 groove barrel and a tight chamber and neck in the 30X60 cartridge. We were shooting 170 some grain Linotype bullets at 2,600 fps with are targets at 300 yards. The targets, clay pigeons are probably no more than 1 1/2 MOA in size at that distance, yet we hit virtually everyone of ’em. This is close to SMK accuracy in a 308 match rifle, so kudus to both Larry’s expertise in casting and loading as well as Goodsteel’s obvious competence in building accurate rifles.

      After cleaning our rifles this afternoon, there was not a speck of lead on the patches as they came out of the barrel. Just got to love that.

    • #30081
      Goodsteel
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      Thank you for the high praise sir!

    • #30098
      WCM
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      What exactly is a 30X60 cartridge?

    • #30102
      Sgt. Mike
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      the 30XCB is usually 30×57 with the shoulder and neck being like the 30-06. the 30×60 that Larry had done was the same except longer. Basically it is a 30-06 that is 3mm shorter yet keeping the shoulder and neck dimensions. ( it is what you need LOL, DAWN was a solid build Larry used a quality barrel for her)

    • #30109
      Sgt. Mike
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      As I understand Scharfschuetze you took a shine to the combo.
      I’m sure Tim can put one in your safe :):D

    • #30114
      Goodsteel
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      The 30XCB cartridge was Larry’s original concept (he called it the 30X57).
      As I understand it, he postulated that if one were to short chamber the 30/06 cartridge, abd cut the same amount off the dies, a very viable cast bullet cartridge would be the result. Slightly more case capacity than the 308, but with a long neck so you could always keep the bullet inside the neck.
      I wanted to take it a step further and not only use the cartridge, but create an entire system that gets all the details pointing north for a hail marry pass at the fastest long distance cast bullet performance in history. Seems like everybody knows pieces and parts of what works, but getting it all to come together in a plug and play system was like herding cats. So I decided that for once in history, I just wanted to make everything right, and I nicknamed all of it “XCB”.
      I have the XCB cartridge
      30XCB and 35XCB reamers
      XCB rifles
      XCB bullets (both 30 and 35 and two versions of each available at Accurate and NOE)
      XCB seater
      XCB TIR indicator
      XCB mold lube pens
      XCB dies
      (I’m working on getting a coffee cup too, because it played a big role as well. LOL!)

      When Larry had me build his rifle, he requested that I ream a bit deeper and get him some more case capacity and submitted a shell casing to headspace to.

      I did exactly as he bade me, and constructed the finest rifle I could muster for him and he waited patiently for it while I did my work, and I dare say it was worth it. I’ll never forget how Larry broke 3000 FPS @ 1.5MOA just two weeks after receiving his rifle. That was an excellent Mauser.

    • #30130
      WCM
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      What powders and loads are you using to achieve this?

    • #30131
      Larry Gibson
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      I’ve found AA4350 to primarily be the best powder for HV cast bullet shooting in the .308W with 10, 12, 13 and 14″ twist barrels. With AA4350 I have maintained consistent 1 to 2 moa out to 300 yards at 2200 – 2600+ fps depending on twist with the 30 XCB and 311466 bullets cast of #2 alloy. I have done this with psi’s (measured with Oehler M43) maintained under 50,000 psi.

      I’ve also found AA4350 to be the best powder for top end max velocities with the 30 XCB bullet cast of #2 alloy (harder alloys provide no increased accuracy) at 2900- 2950 fps in the 30×60 XCB with the 31″ Broughton barrel with 16″ twist. The 30×60 XCB has just enough case capacity increase over the .308W and 30×57 XCB to attain that velocity level with 100% load density while maintaining psi’s under or at 50,000 psi +/-.

      H4831SC is my second choice but being slower burning the velocities are not on par with the AA4350’s. In a 30-06 XCB with 30″ barrel of 16″ twist it may prove to be the better powder.

      For cast bullet “standard” loads in the .308W having 10, 12, 13 and 14″ twist barrels at velocities of 1850 – 2400 fps range (top accurate velocity dependent on barrel twist) I’ve found H4895 with a Dacron filler to give consistent excellent performance in many different rifles including the 30×60 XCB with the 16″ twist.

      All 3 powders ignite easily and burn uniformly at the usual, even the HV, cast loads. With the Oehler M43 I can measure the internal ballistics and see which powders produce the most consistent internal results. Granted the better internal ballistics won’t show up on target at 50 yards many times and sometimes even at 100 yards. However, when you shoot longer range the better internal ballistics make a huge difference.

      Larry Gibson

    • #30132
      WCM
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      Have you tried H4350? Can you tell a difference?

    • #30141
      reloader762
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      This is all some good stuff right here. To a handloader,caster an shooter it’s what dreams are made of.

    • #30145
      Scharfschuetze
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      reloader762;n9805 wrote: This is all some good stuff right here. To a handloader,caster an shooter it’s what dreams are made of.

      Amen to that.

    • #30178
      Larry Gibson
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      I haven’t tried H4350 in the 30×60 XCB but did in the .308W Palma rifle. It did not have quite the load density as AA4350 and I was able to duplicate the same velovity level. I only tried one lot and that was several years back. Not certain if todays H4350 is the same.

      Larry Gibson

    • #30187
      WCM
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      I guess I have about ten pounds of IMR 4350 and one pound of AA 4350.
      I always shot IMR 4350 in different calibers while growing up so that is what I buy.
      My .30/40 Krag RCBS dies have 68 stamped on them.
      We use to use it in a .243, 7X57,and .30/06 as well.

      The H4350 is one of extreme powders so I guess it is probably a better choice.

    • #30195
      Sgt. Mike
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      Well Larry I did locate some AA4350 today and naturally it followed me home, wish me luck in that raggedy old ought six of mine (shooting for 2700-2800 with the XCB).

      :rolleyes:

    • #30202
      WCM
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      No need to mess with perfection ,and sounds like you have found it with that load.
      Did you say what lube you are using?

    • #30205
      Larry Gibson
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      Lar’s White Label 2500+

    • #32996
      Remmie
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      Larry, just out of curiosity, what load would you recommend for a 30xcb in 30-06 with a 10 twist barrel? I have a few that were given to me to try out and I have run them up to 2505 fps, but the accuracy wasn’t great, about 3.5 ” at 100 yds. I was using imr 4350 in my 03a3. I am torn between going for more speed and backing it down for the accuracy. Do you think I can find an accuracy node a little faster with this twist and bullet? And do you think a little dacron would help?

    • #33000
      Larry Gibson
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      Unless I’m hunting with cast in my 10″ twist ’06 I back down for accuracy. When hunting I use a Lyman 311041HP or a 311299 HP’s with a 1/8″ Forster HP tool. I push those to 2100 fps and maintain right at 2 moa at 200 yards for the 1st 7 -8 shots out of a clean barrel which is all that’s needed.

      Backing down with either the 30 XCB or 311466 bullets to 1900 – 1950 fps I get 1 – 1 1/2 moa accuracy all day long. With those two lighter weight cast bullets a faster powder is in order. SR4759 was always a very good powder but, alas, is no longer available. I’ve found 18 or 19 gr of Alliant 2400 with a 1 gr Dacron filler to be an excellent load with both bullets. With my match M1903A1 Type II with Lyman 48 S rear sight that load will hold the 10 ring (1.76″) on the 100/600 reduced NMC target. ……if I do….:confused:

      I have worked a little bit with Hodgdon IMR4227 under the 30 XCB and it’s holding very good promise. Again a Dacron filler is used and 1850 – 1950 is the velocity sweat spot.

      Larry Gibson

    • #33009
      Remmie
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      I was using imr 4350 for the xcb, and have just been loading 5 rounds per load to try to narrow down a good load. 49.2 grains with Dacron (1.2GRS) gave me 3 that cold be covered with a quarter but the other 2 were about 2 inches from the group. Average velocity was 2355. Then I jumped to 52 grains and ended up with the much larger spread, no real group. Average velocity 2505 fps. I am still going to buy a mold this month, I just need to keep my feet on the ground and realize HV isn’t going to happen accurately with this rifle. On the other hand, that C-312-185-1r that you mentioned one time will cut the bullseye out of a target with a ten round group at 100 yds with 34grs of 4895 and some of that “magic dacron”. Again, 1.2 grs. I seem to have a talent for pulling off exactly that much and laying it on that Frankfort Arsenal scale. I have a Remington Sportsman 78 in .270, I might look at having Tim put a 14 twist barrel in 30cal on it and going in that direction.

    • #33013
      kens
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      Larry,
      What about Leverrevolution? I thought that powder was the cat’s meow??

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