Sent my CZ in to AHR to get the number 2. Cutting the barrel to 22". Anyone have the speed for factory load with a 22" and how fast can you push it? My loads do 2300 out of the 25" but arent maximum.

Thanks

Anyone chrono a 22" barrel?

Math says you should lose 20 fps per inch or 60 fps. I don't think the game will feel it. The change in balance (which may be better or worse) is probably more important as is how it handles.

In my 458 AccR (albeit slightly larger case volume tvang the Lott) give 2300-2350 fps in my 22 inch barreled rifle... Would never have a longer barrel than 22''

I have several 22 inch Winchester M70s. What starts off at 2275 fps in 24 inches will go to around 2200 fps in 22 inches. Pushing things you can do 500s at 2225 fps in 22.

Depending on the barrel of course. Most loads will run 2200.

Michael

OK thanks. I think the 22" barrel will be much nicer than the 25"

Here is some data I looked up when I was testing my 458 Lott about a year ago. Using Ohler 35 chrono (85 F).
Rifle is a CZ 550 Upgrade like a AHR #2 but with a 23" barrel. Used data from AA on line resource.

1) 84 gr (AA 2520) Fed 215 Hornady brass 500 gr Hornady DGS; Avg vel 2290 FPS

2) 82.5 Gr (AA 2520) Fed 215 Hornady brass 500 gr Hornady DGS; Avg vel 2220 FPS

Both these loads were very accurate

Another interesting load;

86 gr AA 2520 Fed 215 Hornady brass & 450 CEB 13 @ Avg 2457 FPS; Again, very accurate;

Used the above load with a 450 NF @ Avg. 2421 FPS; very accurate.

Thanks for the info looks like some good loads

Thanks for the info. Did you mean if I push things I can get another 25 FPS? Seems like you could get more than that

quote:

Originally posted by michael458:
I have several 22 inch Winchester M70s. What starts off at 2275 fps in 24 inches will go to around 2200 fps in 22 inches. Pushing things you can do 500s at 2225 fps in 22.

Depending on the barrel of course. Most loads will run 2200.

Michael

What type rifle? I assume the balance and feel is nice with the 22" barrel

quote:

Originally posted by buffalo:
In my 458 AccR (albeit slightly larger case volume tvang the Lott) give 2300-2350 fps in my 22 inch barreled rifle... Would never have a longer barrel than 22''

It is... Its a Ruger M77 (rebuild Hawkeye Alaskan)

quote:

Originally posted by gunslinger55:
Thanks for the info. Did you mean if I push things I can get another 25 FPS? Seems like you could get more than that

quote:

Originally posted by michael458:
I have several 22 inch Winchester M70s. What starts off at 2275 fps in 24 inches will go to around 2200 fps in 22 inches. Pushing things you can do 500s at 2225 fps in 22.

Depending on the barrel of course. Most loads will run 2200.

Michael

All depends on the barrel? I used to use 82/RL 15 for Swifts and Barnes Banded, this gave me an excellent 2275 fps, more than enough for anything, with 500s. These loads were touching between 55000 and 60000 PSI. Getting close to max. So there was not much more room there. This was 2006.

The straight HH based cases are not nearly as efficient as a shorter RUM case with the same capacity. There is only so much you can do with that. Today, if I was messing with 458 Lott in a serious manner, I would whack the barrel to 20 inches and devote the rifle to lighter 450/420 BBW#13s in which velocity could be run up to reasonable limits.

Michael

Thanks for the info I am sure it will be all I need. I was avg 2279 out of the 25" with a less than max load with 500's at 110 degrees F with 84.5 748 and hornady DGX. I will use the re15 from now on as it is good for the .416 as well I have heard

If you want some data on "real" bullets, not that hornady junk, then you can download a .pdf I did not too long ago on 458 Win and 458 Lott with the BBW#13s.

In the Lott I did some data with TAC and IMR 8209 as well. Lighter bullets from 420 #13 NonCons to 480 BBW#13 Solids.

Just FYI

At the bottom of this page.

http://www.b-mriflesandcartrid...tional-Research.html

Michael

All these posts make the .458 Lott look pretty sad. With no trick at all, you can get 2200 with an ordinary .458 Winchester and 500 grain bullets.

Better yet, the CZ550 has a long magazine box and the .458 Winnie has a long chamber. With bullets with multiple choices of crimping grooves, like Barnes and North Fork, you can load .458 Winchesters longer than factory specs. With more case capacity (from powder to lands), any difference between a .458 Winchester and .458 Lott is nothing.

You wont get that out of a 22" barreled win mag. The lott will better the win in every situation.

I would assume you could do the same trick with the lott. It has a bigger case has to hold more powder. Plus the short WM rounds did not feed worth a damn in my CZ. Long lotts do great. Anyway it really makes not much difference it will shoot the WM's as well. Nice versatility

Thanks for the info I will check out your site

quote:

Originally posted by michael458:
If you want some data on "real" bullets, not that hornady junk, then you can download a .pdf I did not too long ago on 458 Win and 458 Lott with the BBW#13s.

In the Lott I did some data with TAC and IMR 8209 as well. Lighter bullets from 420 #13 NonCons to 480 BBW#13 Solids.

Just FYI

At the bottom of this page.

http://www.b-mriflesandcartrid...tional-Research.html

Michael