Mark, I don't know if it is important for the bbk you are using or not but I know that Systeme98 posted at one point in regards to setting up the 550 for a 505 Gibbs and I thought there was something in there about re-inforcing one of the lugs to compensate for the large head diameter.

Here it is if you want to read

Quote:

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Indeed,Ray, You may have made a correct call as to a used market (if CZ doesn't.....) In addition to possible shattered stocks there is the feed problem,because of the one size fits all feed well continued from the earlier ZKK 602. The .505 with .640 diameter rim needs more support than the typical .027-030 remaining bolt rim shroud metal at the bolt face when opened up for the Gibbs. The Brit. Gibbs builders spliced 2 strips above and below the ejector slot in the left side of the bolt as a continuation of the left lug. Later, Mauser-Werke made Magnum bolts with this feature as an integral part of the bolt body. Usually known as a "stepped lug" Magnum. The bottom "prong" being + .078 out from the cylindrical part of the bolt aided greatly during feeding because both rt. and left side ctg rims were caught by this projection as the ctg rose up out of the well and this aligned the rim to slip under the extractor.
When there is only the thin.027" rim shroud the ctgs collide with the thin edge which acts like a chisel often causing the ctg. to scoot ahead of the extractor with the result you have either a no or a push feed. A filler piece acting as an extension can be added after, The receiver feed well can be opened to the ideal geometry and probably still use a sheetmetal mag box, The set trigger can be dumped for one without all those extra parts, stock replaced and a good dependable DGR the result. Take heart! If a used market and depressed prices result from an ill thought out 550-505. it can be resurected. CZ might even have persuaded S B to make the ammo.

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Thos. M. Burgess

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Red

The Trigger Guards that I used to make for the BBK02 action for the 505 Gibbs are as follows.

Inside length 3.875"
Rear width ID 1.080"
Front width ID .984"
Front radius inside .250"
Rear magazine hieght 1.800"
Front magazine hieght 1.515"
Thickness of front wall .100"
Thickness of rear wall .075"
Thickness of side walls .050"

Floor plate pocket specs.

Depth of pocket .187"
Depth of spring cut .075"

The Guard bow was a copy of the large Obendorf Bow.

This will hold 4 rounds in the box.

Jim Wisner
Custom Metalsmith

I think I am going to build the bottom metal for my .505 from scratch so I can get a 4 round mag. DOes any one out there happen to have some dimensions of .505 magazines? ANy starting points would be greatly appreciated. THanks

For what action?

Dan,

The required dimensions don't depend upon action, assuming of course the action in question is long and wide enough in the first place.

I believe I have some dimension written down somewhere, if I get a chance I will look them up and post them. From memory I can tell you this much in ball park figures (probably close enough that they could be made to work well)

Width at rear - 1.1"
Width at front - 1.0"
Length 3.85" to 4.00"
Follower will be roughly split down the middle.
Cannot remember front and rear depth well enough to even guess what a 4 rounder would require.

ASS_CLOWN

Appreciate it AC. As you say, action does not matter. FWIW it is a BBK-01(aka hardened steel golf ball. my god these thing srae rough! and hard , too!) If you can get me the specs for a three round box, it woul dbe a great start. I'll play with it until I get a 4 shot job worked out.

PS-you aren't from the Castro district of San Francisco are you? Just curious

I am curious about using a BBK-01 for a .505. If memory serves, the BBK-01 has a nominal bolt body diameter of 0.700", which after polishing is probably something like 0.695". The Gibbs has a max rim diameter of 0.640". Does the left locking lug of the BBK-01 bolt protrude in front of the bolt face like the P14 Enfield to provide a case rim holder opposite the extractor? Of course a Gibbs can be built successfully using only a 0.700" bolt, but it is preferable to have a bit more metal left to hold the rim than would ordinarily be left on a 0.700" bolt.

Marc_Stokeld,

Quote:

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PS-you aren't from the Castro district of San Francisco are you? Just curious

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No I am not. Actually, I have not been to San Francisco in probably 25 years.

Dan, aka 500grains, does bring up a good point about the bolt diameter. The old Magnum Mausers only had ~ 0.695" diameter bolts, but the 505 Gibbs chambered rifles had a built up lug on the side opposite the extractor to do precisely what Dan is speaking about.

ASS_CLOWN

THe BBK-01 has a .727 bolt body (after polishing it up). It is the exact same action as the CZ 550 Magnum. I have one of each on my bench right now. CZ has a .700 bolt. The BBK has the projection on the left side of the bolt face as a Mauser, and it is .025" longer than the CZ bolt. It is not a forward projection of the lug as in a M93 Mauser. Have not fooled with an Enfield in a long time and don't remember what their bolt looks like. I would prefer a larger bolt, but at least it is not the typical .700 bolt.

THe action will look quite different if I ever get it finished. I have been cutting, hacking, welding, grinding, filing, and everything else to the action. Of course, I have personal projects in the shop which were started in '00 that are pretty much in the same state of completion as they were back when CLinton was still in office.

OK, so give me some magazine dimensions somebody. I was originally going to cut and weld the Blackburn bottom metal for a Magnum Mauser to fit the BBK-01, but I decided I need 4 in the mag.

So tell me AC, where did the name come from? GIven the name, I thought maybe you were from Castro. I don't give a damn one way or the other if you are, just curious if not why the name.

AC-the last paragraph sounded different than I meant for it to sound. I was jsut saying that I do not care about any of your preferences in life. Not that I don't give a damn about you or anything. I know that some folks are pretty intolerant of other's choices and I was just saying I don't care how you live your life. THought the name might have referred to a certain lifestyle, which does not bother me one way or another. You probably understood, but did not want to come across as an AH.

I dug through a mountain of old magazines and found my old copy of February '89 G&A. Lott had a 5 shot mag on the .505 in that article. I also looked at the 5 shot mags at:

http://www.470mbogo.com/RBreeding.html#

THey are a little deeper than I am looking for. I may go ahead and go 5 shot, but will probably go with a 4 shot mag. DOes anyone know of extra large boxes out there, or is this for sure a bench made deal?