The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores Question for CZ550 .505 Gibbs owners, PLEASE........Go | New | Find | Notify | Tools | Reply | |
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In THIS THREAD I asked a simple question that I need answered. Would one of you owners of a CZ550 Safari Mag in .505 Gibbs PLEASE do me a BIG favor: measure your bolt diameter at the head parallel to the bolt's lugs??? My CZ 550 Safari Mag. in .416 Rigby measures right at .6975. I was wondering if CZ used the same bolt for both calibers and just did a slight amount of machining to open it up for a .505 Gibbs.  If anyone would like to email me a pic of your CZ550 .505 Gibbs' bolt head, that would be appreciated as well.  JFYI, the Rigby's case head is right at .590, while the Gibbs is .640. "They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | ||
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woodsracer, They are the same bolt. Yes you can turn any CZ 550 Magnum into a .505 Gibbs. If thinking .408 CheyTac, however, just remember that this action with a .640" case head is limited to 3800 bar or 55,100 PSI. The Chey Tac can be loaded near 70,000 psi. Might as well do something like the .475 Kifaru (Gibbs head size) and keep pressures down, or do a .408/.416 Rigby and get pressures up to .416 Weatherby levels. Here are some pictures:  The brass is smeared on the bolt by trying to force chamber the A-Square made CZ factory ammo that has since been scrapped.  There are rough edges on the extractor that need to be smoothed.  Above: .404 Jeffery with 1x-4x Leupold scope in old BRNO rings, and the .505 Gibbs. Below: The other side of the .505 Gibbs butt is prettier:  Finally the muzzles and front sights: That's McGowen Micro Land Wonder Rifling of 10" twist on both I do believe. That alone makes them worth buying.  I know where 2 .505 Gibbs and a .450 Rigby are right now, collecting dust on a dealer's shelf. | |||
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Forgive the size above, please, but it is necessary to better convey the details. The Gibbs weighs about 10.75 pounds bare, and needs work to be serviceable: two cross bolts, polishing of feed ramp and rails and extractor, pillar bedding, and reinforcing the front of the magazine box with a steel plate instead of a rubber pad.  It has survived unscathed through a dozen light loads of 100 grains of RL-15 with 525 grain solids pulled from the A-Square ammo, just to check the chamber, which seems fine. Work in progress, on the list. The .404 Jeffery weighs about 9.5 lbs bare, and holds 5 in the box instead of only 3 for the Gibbs. The CZ 550 box is ideal for the .404 Jeffery by Mauser cosine law, though too long for standard COL. The .404 Jeffery feeds anything and everything smoothly and reliably. With the .505 Gibbs, flat-nosed solids will not feed from the left side of the box, but round-nosed ones feed fine from both sides every time. The box is not ideal for .505 Gibbs. Vertical stack would make it work best, but many of the "finest" guns make do with boxes too small for the cartridge.  | |||
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Very nice RIP.............................I need to make more money | |||
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What's that Bowie knife for? In case pirates board your bass boat and you get into a sword fight with them?  Will the .404 feed flat nose solids from both side reliably enough for a DG hunt? Is the NECG front sight something you added later, or did it come from the factory that way? Do both the .404 and the .505 have the rather cheesy CZ rear sight with the numbers stamped rather crudely and then filled in with white paint? Is there an aftermarket sight that can be slipped into the dovetail that CZ put on the barrel for its OEM rear sight? | |||
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The Bowie is issued with the rifle for clearing jams. "Experience" is the only class you take where the exam comes before the lesson. | |||
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"They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | |||
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Dan, What a golden opportunity to educate you! First let me say you are forgiven for your lie about my having lost hospital privileges. Whatever your reason for making up such BS ... let it be water under the bridge ... after this. I do not take such impugnment of my character lightly. I know that you thought you had found some dirt on me by surfing the internet and finding an old web site that was offered as a free service of the AMA. At the time that went up, I was working a free standing minor emergency clinic that did not involve hospital work and I did not include any hospital affiliation. I never maintained that web site after the initial entry and certainly don't need to now. I assure you that I currently have hospital privileges and have had them in four states from Alaska to Connecticut since then. You may apologize or not. Do I have your "source" of information on me figured out? If so, let's let that sleeping dog lie. Now, your questions: The "Bowie Knife" is a Ruana made in Montana and purchased at Mountain View Sporting Goods in Anchorage, Alaska. It looked like a good pig sticker, and having recently speared a couple of Russians in Tennessee with my Cold Steel Boar Spear (C), I was looking for smething to take to the Cumberlands on the next trip to get more personal. It is just a prop for the photos, but it has "RIP" carved in the scabbard as my personal mark. I made the scabbard for this small sword myself, and no, I did not learn leathercraft in prison, I am self taught. I do not like bass fishing, but I will not turn down a float boat trip on the Kasilof River in the Kenai Peninsula when the Kings are running.The CZ .404 feeds North Fork flat nose solids slick as greased owl crap. All of them, the old Ogive FN, the new Truncated cone FN, and the Cup Points. I believe a sample of solids from North Fork is in the picture. I have a close up of the bullets standing on the knife handle I will post after these answers to your questions. The NECG front sight is from the factory, but you will see both the standard CZ front or the custom depending on the order specification, for any of the Safari Classic line. Both of mine pictured have the "rather cheesy CZ rear sight" which is dovetailed into an integral island base on the CZ barrel. It is better than most and fine with me. I like it. I do not know if there is an aftermarket rear express sight to replace the excellent CZ sight. I wouldn't want one unless I "had to," for some such reason as that I had destroyed the one from the factory by some mishap.  | |||
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Woodsracer, I read your thread, but had nothing else to add, beyond the above. I'll go add the usual perfunctory "Congrats" on your Ruger .416 Rigby, fine gun.  .338/.408 Chey-Tac? Have at it! Others have done the .338/.505 Gibbs and raved about it. Forget CUP. Think PSI. Then everyone will be on the same page. CUP and PSI are not the same numbers though they are used to refer to the same pressure. The PSI number will be higher than the CUP number for any given absolute value of pressure in a bottle necked case. It is a complex relationship that is a curvilinear function when graphed as X versus Y, CUP versus PSI. Each cartridge has a different parabolic-type curve. Ask Alf. You have to think bolt thrust, not just pressure. Go read 500grains' thread on the Gunsmithing Forum about bolt thrust in the .585 Nyati. The standard length Mauser 98 is not such a good idea for one, but the CZ 550 Magnum would be, as long as pressures are kept reasonable for the bolt thrust they produce for the given cartridge. You or I do not want to use maximum .408 Chey-Tac loads in a CZ or a Granite Mountain action. The .475 Kifaru and the .510 Tembo are in the works, after the .423 Lapua is finished, assuming I am still kicking. They will be loaded to 50,000 PSI levels or less. Learn to post at a photo hosting site and show us your Ruger stock. I have seen some beautiful Ruger stocks on the RSM, ja. http://www.photobucket.com is excellent, and free. You can make the pictures smaller than these original size ones by doing it at Photobucket. The Hogback definitely needs crossbolts, pillars, and glass bedding, but I love that stock for any rifle. The .505 Gibbs and .404 Jeffery CZ's are shop mules for HA!/DOA purposes. They will be properly reinforced eventually, as I have done with my Hogbacks. The McGowen barrels must be standard on the Safari Classic line, as they are built here in the USA. The rest of the standard CZ rifles have Czech made hammer forged barrels, and they are usually excellent. I understood that CZ USA would use any barrel make you want on a special order basis. As far as I can tell, these McGowens are fast twist (1 in 10") and I have had excellent results with every fast twist Mcgowen barrel I have tried previously: .460 Wby, two .500 A-Squares, .470 Capstick, .404 Jeffery on a Winchester M70 Classic, etc. I have a Mauser Banner Prechtl actioned rifle, and several other original Mauser 98 actioned rifles. The CZ 550's can be turned into pieces that will match anything for function, but not snob appeal nor nostalgic quivering and gushing. | |||
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Hmmmmmm?!? On the CZ550 Safari Mag. page the "General Overview" notes a "Hammer forged barrel." If the Safari's have such a high quality barrel from the factory, maybe I'll just keep elk hunting with the CZ in its current Rigby configuration, but concentrate on a quality all season finish to end the rust problems in the mountain snow. SO, RIP, you were in Ten-uh-see spear hunting hogs?!? Where'd ya do that at? I'm right on the western edge of the Cumberland Plateau! You might'a been close to me and never knew it. Either way I go with the CZ, THANKS FOR ALL THE INFO!!! "They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | |||
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Woodsracer, I was at Alan Wilson's Wilderness Lodge near Cookeville, TN. 5 times so far. Been there? If you go, ask Alan if he remembers "Dr. Death" with a spear and a sprained knee.  The knee recovered completely, but it was pretty swollen thanks to sidehilling falls on slick, wet Tennessee rocks, and side stepping with a charging boar impaling himself on the spear I was hanging onto. Thanks be to the cross gaurd. Lateral collateral partial tear that healed completely good as new. | |||
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HA!!! I live in Cookeville! No Kidding!!! "They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | |||
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Nice college town. | |||
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Yep, when it's in session!!!  Where do you hail from RIP?!?  "They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | |||
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Fort Campbell, Kentucky. Born on an army post. Live in Clarksville, TN right now. Family started in western Kentucky in late 1700's. 10,000 acre land grant for service in the Revolution. It has been downhill since statehood for Kentucky. Clarksville, TN ... Fort Campbell, Ky ... Oak Grove, KY ... they all blend together now. Ft. Campbell is mostly in Tennessee. | |||
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RIP, Thank you for the peace offering. If you do not mind, and I hope it will not re-open the debate, but I would feel more comfortable pointing out that I aggressively queried about H.P., which I saw you interpreted as a factual assertion. To the extent my posts caused hurt, please accept my apologies. Fortunately, you seem to have a very thick skin, something which must have been developed over many years of intellectual, verbal and professional combat. Best regards. | |||
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Peace, Brother. You too have grown in maturity. | |||
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Prodigious!!! I was BORN in Clarksville!!!  Gee, I don't know what 500grains is talking about---musta missed that one (unless it was the Bowie knife comment, and JFYI, THAT'S A SOUTHERN THANG)---but seriously you've gotta have TOUGH SKIN to hunt Russian boar with a spear  ..........even if it WAS made by Cold Steel!!!  500grains seems like an upstanding fella for openly apologizing though.  My hat's off to ya, Mr. 500 (that's a BIG compliment considering my head's BALD and it's COLD out). BTW, RIP, I'm with ya........it's been downhill since TN joined the Union as well. There are SEVERAL TN counties bearing my ancestors names (yet, somehow I never received any riches from thus), and I am directly related to Thomas Jefferson's grandfather (I have an enormous geneology way back to a Sir McKnight in Scotland in the 1650s, thanks to my aunt's "hobby.") I'm also a Life Member of the "Heritage Not Hate" group, Sons of Confederate Veterans. 11 outta 13 of my direct relatives (not counting cousins) served in the Confederate Artillery group Maury Artillery. Now those fellas learned to love BIG BORES!!! First at Ft. Donelson (read the LINK), then later at Port Hudson. ALL, hence my custom avatar!  Sorry, restless night tonight!!!  "They who would give up an essential Liberty for Temporary Security, deserves neither Liberty or Security." ---Benjamin Franklin "SIC SEMPER TYRANNUS" | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores Question for CZ550 .505 Gibbs owners, PLEASE........
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