got a couple of replys to the .505 mag thread regarding the modification to the left lug on th elater Magnum Mausers to help support the .505 case during feeding. Does anyone have a picture of this? IS it written up or shown in any books or articles?



THe bolt diameter at the face is .730" on my action (BBK-01)



DO you think I would need reinforcement? If so, what is the best way to do it?



I see where folks here who make .505's with the old 602 and the 550 Magnum actions. Are the bolt faces just opened up on these or are there other modifications made?



Thanks

Marc,
think about a 550 magnum or express LONG before the gibbs...

gib brass.. AT LEAST 2.50 each, in quanity 1000+

weatherby 460 brass... 50� on ebay every day


jeffe

I'll second jeffe's post, especially since there may be a real possibility of CZ making a factory 505. If I had to start over I'd do the 550 and wait another year to see if the CZ 505 becomes reality.

TT,
if i had had your 505 barrel, i would have done the gibbs TOO!!!

on the 550... sure the gibbs is a bigger case... but if you can take much more of a beating than what the 550 mag will deliver, then you SERIOUSLY need to consider taking up pro boxing (without a muzzle brake, of course)

jeffe

A couple of things:

1. I have no interest in a wildcat. Have handloaded for 19 years now, but do not want a wildcat for a varitety of reasons. The #1 reason is that I want a .505 Gibbs, not something else.

2. Even if 5 companies came out with .505's next year, I would still make this one. I don't like factory rifles, again, for a variety of reasons. I guess the top reason is that I know exactly what I want in a rifle and custom is the only way to get it. I know, I'm crazy, but that's just the way I am.

Plus every year gun and ammo companies say they will do things. SOme of these things get done almost on time, some get done in a range from late to extremely late, and a surprising number never get done at all. Every time you call some one at the company in question, it will always be out next month, they just have a few more kinks to get out. They lie as bad as custom gunmakers and taxidermists. So I would not hold my breath for the CZ, even if I were of the mind to buy a factory rifle.


ANother question about bolt faces: What size does the bolt face need to be opened up to for the GIbbbs case? Thanks

Axually (coonass for "really"), that was 3 things

I know what you mean about wanting what you want. That's what makes guns so fun. My problem is that increasing age makes recoil more moticible. Unfortunately the rate of progression is geometric, not linear.

I really think for me, jeffe, the 550 Express is just about perfect for a super big bore, especially considering the actions it fits. I'm sure I'll do one some day.

Sorry, Marc I don't have the actual bolt face dimension but maybe I can find it Monday. Lastly, in practical terms the big 550 is really less of wildcat than the 505. Both have limited brass availability and bullet choices (although the Gibbs is far more limited than the 550 regarding bullets). Not trying to dissuade you from the classic Gibbs; just making a pointless point.

Trust me, I am very familiar with metalurgy and heat treating. I have never welded on the head of the bolt (welded a bucket load of bolt handles) but I have welded pounds and pounds of rod on actions. Just send them out to be reheat treated and things are ok. And behind the lugs, I just weld away and don't have to worry about it. Bolts are sent to be re-heattreadted at the same time as the actions. And this is assuming things got hot. For very small cosmetic welds, or welding up hosed up screw holes, then I can keep it cool enough to not worry about anything. I've shortened and squarebridged Mausers and their bolts and you really pour the heat to those.

Wow, this has gotten on a tangent that has nothing to do with a Gibbs anymore! I am going stir crazy being locked up inside and not being able to do much of anything. I am on the verge of losing my mind. I hope they can get me fixed up this time.

ANyway, back to the origianl topic, does anyone have a picture of an ENfield bolt head or an original Magnum Mauser for a Gibbs? If my bolt will hold it sufficiently, then I won't monkey with it. But I would like to see what the originals looke dlike. ALso, if i had to, I would weld on the bolt. Of course this would mean that I would have to modify the reciever and get things reheat treated. But don't want to if I don't have to.

Actually, I thought about drawing back the action just because it is so damn hard and it is taking forever to polish. I would then have sent it to be heat treated after reshaping and polishing the raction. I have no idea what the Rc on this action is, but man it is high.

The 585NYATI and the .600OK both use a .640 boltface and it works fine on a CZ550 as long as you don't drop the bolt face down on a rock or some concrete, then it's new bolt body time. I have re-case hardened mine after machining and have had no problems. I have seen a .505 gibbs on a CZ550 and it worked OK.Personally i'd use a Vektor or a GMA but a CZ550 is OK IMHO. Good luck getting it to feed though and it will probably only hold two down.-Rob

Dan,

At least some of the original Magnum Mauser rifles in 505 Gibbs had lug extentions soldered/brazed to the top (left hand) lug, extending forward to improve cartridge control. I know I used to shoot one!

Cannot get you picture though Marc, as the rifle was sold many years ago.

ASS_CLOWN

Mark my 416sw uses a 505 case I will try to remember to take a pic when I get home and post - email would be better, my action is a BBK but think it is a 02.