bought a cz602 in .458 win from cabela's used gun section the other day. has a 2.5 leupold on it,so i think i'm good to go.anybody done a home rechamber to the lott? can i use .458 win dies to reload .458 lott?

any way,i'll shoot some upper .45-70 loads in it just to play.

after that,i'll put it in the classified as i don't really want to hunt with it.

any comments as to rifle quality/loads,etc are welcome.

thanx,guys

Why rechamber if your going to download it?? Let the next guy do it if he needs the speed. Clint

good point.

There have been reports of feeding problems with this rifle in 458 Win.

465H&H

If you're just going to flip it for a profit, don't modify it in any way.

George

I have a zkk602, originally a 458Win issued to Jon Speed when he was with the Tanzania game dept, rechambered to Lott. Feeds & functions fine. 458Win dies also work for the Lott, same as 38/357.

quote:

Originally posted by fla3006:
458Win dies also work for the Lott, same as 38/357.

How do you full-length size .458 Lott brass (2.8") with .458Win.Mag. (2.5") dies?

George

quote:

Originally posted by GeorgeS:
How do you full-length size .458 Lott brass (2.8") with .458Win.Mag. (2.5") dies?
George

They work just fine. I've been using RCBS .458 Winchester dies for my Lott for a couple of years now.

Did you buy it in Ft Worth? If so I looked at it Monday night...it's a cherry gun. I would have bought it but the stock didn't fit me at all.

i did buy it in ftw.you are right- it is a big honker of a rifle and will take some getting used to.not only a step up in power,but is considerably larger than anything i have ever handled. probably helps to handle recoil.

Like 465H&H said. I had one in 458 and it would not feed. Put that barrel on a 98 action and put a 375 H&H on the 602 and it feeds fine. Perhaps the Lott cartridge will feed better. The 458 gets lost in that huge magazine.

Hi there,bought a zkk 602 (.450 watts) from a retired Ph friend of mine.He bought the Brno as a standard 458 win and converted it to the watts,shortened the barrel to 22".

I then made a 458 Express because I wanted to get that little bit extra performance ext.What I didn't realized is that the barrel was already to short and lengthening the chamber to accommodate the longer Express case was only giving me slower ballistics

Now who can tell me how many fps can one plus/minus get more with every inch longer,I want to get a new barrel and I want to do it right this time!

I can't find my Remington formula for calculating loss. But when I cut my 602 375 (fla3006 - it was Jon Speeds rifle when in Tanzania also) to 21" the loss per inch for the 375 was around 30fps per inch. I also cut my 550 416 Rigby to 21" and the loss calculated about the same so I doubt it would be much more for a 458. With todays powders I don't think you are sacrificing much cutting to whatever length you desire. I know the last Elephant I shot with the 416 didn't complain the bullet was too slow. And the 375 has accounted for a LOT of game.

Thanks Zim,

To give u a example,when I chrony'd the watts with a 500gr bullet I got 2216fps with 80gr of s321 powder,I only get 2186fps with the Express with 82gr of s321,I should get 2300fps and up!

I chambered a round in the Express and took a ramrod to measure from the tip of the bullet to the tip of the barrel and it measured only 18",so actually the barrel is 18"s long.

So if u are right I must order the new barrel 4"s longer than the 22"s(18") I currently have?

I found the Remington chart I took my information from and they give this as loss per inch from a standard 24" barrel
muzzle velocity Change per 1"
2000-2500fps 10fps
2500-3000fps 20fps
3000-3500fps 30fps
3500-4000fps 40fps
This is from Remington Ballistics charts of Oct 2003 and I would imagine it is still accurate. For the big bores it's even less than I remembered. I don't have a chrono so I have no way of verifying their data but have no reason to doubt their published information. It has always been my belief that too much importance has been placed in velocity of a given load and I have never loaded even to maximum on anything. I load more for accuracy and depend on placing the bullet where it will do the most good. Have had no problems with this philosophy for well over 50 years on everything from Duiker to Elephant and from 17 to 470 calibers. Just one old mans thoughts on the subject and certainly not gospel.

Hi again,

thanx for the info, you're right no problem to kill everything up to elephant,but I help a friend by giving him backup on problem hippo and I don't want to take chances when one of them turns on me at night and I miss the brain,my point being that if I miss I will stand a better chance hitting its backbone ext.

50-100fps can make a big difference when it comes to penetration.

So rechamber to 450 Rigby (AKA beltless Weatherby). With the CZ/Brno you won't have receiver problems though the bolt face, rails and feeding will need smithing.

You will have as much velocity as you wish, up to whatever produces bullets at 7500-8000 ftlbs.