Advice for Axel --REAL--

02 February 2003, 08:38

Axel,
If you are actually deadset on a bigbore, and you got a m70 for $400, i would strongly suggest you go with a 500 jeffe, and send to pacnor for the barreling/feeding. Just to have one that works.

If the 70 is a mag, it will be close to feeding, right out of the box, and you might do this part yourself. I think pacnor's rate for doing the rebarrel is right at 400

Sights, stock and bluing will run something like another 400, if you do most of your own work.

I've shot 577 nitro in a ~14# gun, and it is intollerable, even though I shoot 450s and 416s with some regualarity. In an ~11#, at 2400 fps, without a brake, it will be a religeous experience, as even the starting loads of a 585 will knock you pretty hard.

If you want, I've got some 585 dummies made up, the ones left are NOT in sellable condition, so I would "give" you one for $6.50 to cover shipping, bullet and brass. It won't be nice, but it will let you see what you would be getting into.

If you stick with the CZ route, have Ed building you a 500 AHR, in the lam walnut stock, and it should be rather fun.

Again, In all honesty, since I can't stand to see people hurt, start with a 500 jeffe/ahr for your first true big bore. I am assuming your 50/110 is not one you've actually shot, so it will be eye opening to get started.

Actually, thinking about it, if you had a cz550 in 458 win rechambered into 458 lott (le cheapo magnifico) you would take steps in a good direction. leave it at 9.5# to get used to it..

best of luck
jeffe

[ 02-01-2003, 23:39: Message edited by: jeffeosso ]

02 February 2003, 19:02

<Axel>

Thanks Jeffeosso for the advice. Actually, several people have been telling me to make it into a 358 or 375 magnum and be done with it. I must admit that I find that idea of building a 375 appealling. I am waiting for 500grains' pictures before making a final decision.

Axel

03 February 2003, 14:27

500grains

Here is the advice I emailed Axel:

quote:

AD,

I have no digital camera and is is a big hassle to photo, scan, upload, etc. the lousy blurry close ups I get from a 35mm. As a guy without a computer, I am sure you understand.

I suggest you reconsider the model 70. To shoot hot loads (2500 fps+), you need to drill out the action threads and re-thread the action. Otherwise you must stay with mild pressure.

Due to the model 70 action size, the only way to go is with a hand made single stack mag using a hand made follower. My follower is flat and canted 15 degrees right.

The mag spring has a keeper on the follower and on the floorplate.

The floorplate has an extra screw so that it will not pop open.

The rails are opened wide about 2/3 of the way to the chamber, but remain relatively narrow at the rear. This creates a stepped appearance. The cartridge feeds up at the end of the step.

I urge you to reconsider. Get a cz550. It will be cheaper and will work much more easily. You really need a high end smith to make a model 70 work.

Good luck.

04 February 2003, 05:20

jeffeosso

quote:
Originally posted by Axel:
DANTEC,

I do not see the EXTREME difficulty you are thinking exists with this conversion. According to my calculations the M70 is fine for the 585 Nyati, AS LONG AS, YOU DO NOT EXCEED THE 577 NE LOADING. What this means it that a M70 action is fine if you only want to get 2100 fps with a 750 grain pill. This is afterall, all the ballistic performance I need!

The feeding issues are relatively simple to address. Squaring off of the action requires only a purpose built mandrel and a lathe. Lapping the lugs is agains a simple exercise utilizing a purpose built jig, lapping compound, and some elbow grease. Setting up the barrel is simple exercise in the use of depth micrometers, parting, and possibly threading. Installing a barrel recoil lug, no brainer, machine shallow groove and solder lug in place. The groove will provide a shoulder for the lug to bear against. This is all very basic machining and I see no BIG problem.

In my opinion the work required does in no way justify a $5000 price tag. There is seriously only about 20 man hours involved in the metal work. To meet that estimate does not require killing yourself either!

Having said that, I am seriously contemplating a 375 or even a 358 instead. These are more PRACTICAL chamberings than a 585. The machine work required would be almost as significant, however.

Axel

Axel,
Seriously, just build/modify a cz550. Heck, get a 416 rigby, and then plan on making it an 470 mbogo.

Or, if you have the winnie already, reduex to 450 express, just to be different.

It would be "criminal negligence" to make and mark the barrel of a gun "585 nyati" and it NOT BE SAFE for full house loads.