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Originally Posted by Riflecrank
Shooting at 50 yards because:

1. It is the only spot at local public range where terrain allows my chrono to be set up high enough on tripod to allow readings at 5 yards and be able to shoot into a target.
Only other option there is to go down to 600-yard bench where the ground is flat, without a significant drop-off in front of the bench.
I have two functional optical chronos (Caldwell G2 and Oehler 35P) and will not pay for a Lab Radar until I shoot those opticals into nonfunctionality.
I have killed two chronos in the past with shotgun wads.
Waiting to kill two more.
With Lab Radar I could shoot from any bench.

2. At 50 yards the big bore rifle goal is to get three bullets into the same hole.
50 yards is the critical spot-on range for a big bore DGR for offense or defense.
Screw the 5-shot groups for group size with the big bores whether at 50 yards or 100 yards.
5 shots takes too prolonged a concentration on shooting technique to be as much fun as 3 shots.
5 shots per load is done only in looking for the magical standard deviation of less than 5 fps for those 5 shots.
Depending on the rifle's accuracy node, that could have decent accuracy potential and functional load potential.

3. Yes wind drift at 50 yards might only be 2" on a bad day, but it would be closer to 4" at 100 yards.
Horizontal stringing including lulls and gusts could be whatever the stated drift is plus any shooter error plus any rifle&ammo error.
More frustrating at longer ranges: Was it me or was it the wind ?

My latest chronographing was good enough to prove a load of 81 grains AA-2230 with my hardcast, PC-painted, gas-checked bullets.
Accuracy potential is there.
When I go back to shoot a final zero in comparison to Shock Hammers,
I now know the loads with those bullets and the Shock Hammer are interchangeable.
And I will do it on a calm day !

I do have 1:18" and 1:20" twist rifles chambered for .45-2.6" StarLine brass fired in chambers with .458 WinMag throating.
They are only 2 grains of water bigger than the .458 WinMag
Dave Manson reamer will so alter any .45-70 Govt. chamber. Identical to .45-70 Elko Magnum of CIP homologation.
Slower twist might be better for cast, but the 1:14" .458 WinMag twist is doing well enough, even at +2500 fps with 400-ish-grainer.
Probably could kill a deer with that .458 WinMag and the Hi-Vel Hardcast,
might work for woodchucks too.
For sure a good practice load to save on Shock Hammers.

Thanks for answering my question regarding range shot. That makes sense, especially if using and setting up an old chrono. However, yours is a lot newer and easier to set up than the one I use. I don't shoot the big 458, that may change, but I'd probably just shoot 3 shots per group and call it good, but 50 yards and 5 shots makes sense. Especially in the wind. I don't use a chrono much because mine is old and a PITA to set up, like it sounds like yours is. Mine may be older though, and it only gives me velocity readings. I have to shoot through a stupid window in cardboard inserts that go into the chrono.
[Linked Image from i.imgur.com]
Maybe using a chrono is more important with those cast bullets, but I rarely need to use one with jacketed bullets in my hunting rifles. Groups tell me what I need to know. If I need to know velocity for dope and data, so be it. I'll pull the PITA chrono out and get some numbers. Velocity numbers, I could care the fu ck less about sd/es, as the group will tell me if those numbers are good. Just how it is.. Been tested and verified.


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

BSA MAGA
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BSA,
Mighty good 'ol boy of you, thanks. That is a practical method.
The smallest st.dev. load won't always be the most accurate load in a rifle, but sometimes it is, when it happens to be at the sweet spot for the rifle harmonics.
Still it is one measure of internal ballistic uniformity and reproducibility, whatever the pressure and velocity of the load.
Handy shorthand communication.

https://www.calculator.net/standard-deviation-calculator.html


Ron aka "Rip" for Riflecrank Internationale Permanente
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.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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Yesterday winds were gusting to 50 mph, almost made me homesick for Alaska.

Public Service Announcement:

A SAAMI .458 Lott can be transformed into a more powerful rifle
by re-barreling it to SAAMI .458 Winchester Magnum.

[Linked Image]

Chambering designation on barrel of above rifle:

[Linked Image]

[Linked Image]

From Czech Republic by way of Kansas City, MO, USA, a few years before they quit making them,
CZ must not have wanted to change the tooling used to make .458 Lott rifles.
Original CIP homologation date for the .458 Lott appears to have been on or before August 24, 2000.
The CIP revision of May 15, 2002 continued to show the Deep Throat version.
The CIP revision of May 16, 2006 finally shows a short throat that matches the SAAMI version of the .458 Lott.
CIP and SAAMI homologations of the .458 Winchester Magnum have always been identical,
except that CIP allows a higher Maximum Average Pressure.
Same MAP for both .458 Winchester Magnum and the .458 Lott according to CIP.


Ron aka "Rip" for Riflecrank Internationale Permanente
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.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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Here is my other .458 Lott that got re-barreled to a more powerful chambering:

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

That Leupold 6x36mm Compact scope has been known to withstand prolong use on the .577 Tyrannosaur.
The rig pictured above with that scope will be most trouble free for .458 Win. Magnum varminting.
Just check all screws for tightness after each 20 shots ... or less ... depending on OCD severity.


Ron aka "Rip" for Riflecrank Internationale Permanente
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.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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Another load tried in the same Ruger Mk II .458 WinMag, about 5 years ago, will be used to illustrate
initial 50-yard shooting and chronographing for 5-shot st. dev., and 3-shot group at 100 yards,
despite a not so terrible crosswind varying between 10 and 20 mph:

[Linked Image]

[Linked Image]

An initial fouling shot (#0) chronographed at 5 yards = 2531 fps and went low on target.
The next 5 shots settled down to lower velocity with tiny variance, 5-yard readings:
#1 = 2515 fps
#2 = 2516
#3 = 2514
#4 = 2516
#5 = 2516
Rounded to nearest fps, instrumental mean = 2515 fps, Standard Deviation = 1 fps for 5 shots.
+12 fps for BC = 0.372, 5-yard correction, gives MV = 2527 fps, in 25" Shilen barrel.
Estimated 24" Shilen barrel velocity = 2512 fps.

Call it a nominal 2500 fps MV load for the generic 24"-barreled .458 WinMag,
and about 2350 fps MV for 18"-barreled .458 WinMag.

[Linked Image]

First 3-shot group at 100 yards had variable winds:

[Linked Image]

Second 3-shot group at 100 yards had less variable wind, closer to steady wind:

[Linked Image]

A total of 18 HV bullets were used for this exercise.
Those Hardcast-Hi-Vel bullets will save some money in substituting for the HV and Hammer bullets
with same powder charges in practice loads for varmint shooting.
Whatever a .223 Wylde can do, so can a .458 WinMag.
Same powders work well in both with slightly different charge weights.


Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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where can we find these HV Bullets thanks Sir James

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Originally Posted by Hydehunter
where can we find these HV Bullets thanks Sir James

Sir James,
The .458/404-gr Shock Hammer is what you want.
It has a better BC, and Sir Jerry proved its terminals as a DRT cape buffalo bullet.

It actually took longer for me to get some of the GSC cataloged 400-gr HV bullets
than it did for me to start from scratch with Hammer Bullets,
begging them to produce a new .458/400-ish grainer
patterned after their .375/270-gr, a simple scaling up of that,
with a 3 mm hollow point.

The GSC used to be tops, but now there is Hammer.


Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
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