As you can see, there is wide disparity in
velocities. Obviously, the manufactures are not loading ammo up to
full speed, to protect shooters who might put their ammo into old
rifles. The fact is, most of the old rifles are Mauser 98 bolt
actions, and could easily take full pressure loads.
Be sure and check the empty case weights,
as they vary a lot by manufacturer. The Federals were very heavy at
180-182 gr. each; with the Sellier & Bellot the lightest at only 160
gr. Winchester and Remington were about the same at 170-175 gr.
Loads that might be great in the Sellier & Bellot light cases, but
could be too hot in the heavy Federals… so be careful.
Of the American manufacturers, only the
Winchester ammo was up to par with what it should or could be.
However, the one that really got my attention was the European
Sellier & Bellot 196 gr. SP load that produced 2480 fps. average.
That ought to make a great load for most game shot less than 150
yards.
Reloading the 8x57mm is a nice simple
process and the RCBS dies I had worked perfectly. The interesting
part was trying to find loads that were not "sub-pressure" like the
Remington Factory loads.
Hodgdon’s data is loaded to only 36,000
CUP, while the Barnes, Hornady, and Nosler manuals had excellent
loads to work with, as did Western Powders.
With Western Big Game powder, I easily
achieved 2650 fps. with a 185 gr. Barnes TSX, and 2550 fps. with the
195 gr. Hornady Spire Point using Hodgdon’s Varget.
That 195 gr. Hornady Spire Point really
seems like it would be an ideal bullet for the 8x57mm. I think that
it is made to withstand the velocities of the 325 WSM, so it should
be plenty tough for larger game at 8x57mm velocities.
As
the field-testing continued, I started changing the seating depth.
Since this rifle seems to have a long "military" gradual throat, I
started seating the bullet way out, just .010 off the lands. This
seemed to improve the consistency of the groups, but the point of
impact (P.O.I.) was still drastically different with each different
load I tried.
I then switched from CCI 200 primers to
Federal 210 Match primers, which is not a "magnum" primer, but is
certainly hotter than the CCI. It must be, as the velocities jumped
close to 100 fps., while the groups stayed the same.
The next thing was to put a De-Resonator (www.limbsaver.com)
on the barrel to help dampen the vibrations. So far, the groups are
now more consistent, but I’m not happy yet.
Speaking of "happy", I was appalled at the
condition of the barrel and throat of this new rifle. The throat was
terribly rough, and if any custom barrel maker had ever sent me a
barrel like that, I would have sent it back in heartbeat. Dumb me, I
just did not look at this when I purchased the rifle.
The trick is now what to do about it. So,
I sent it back to Remington explaining the facts of life, and asking
for a new barrel.
Remington at first declined to send a new
barrel, because they said a cleaning bush damaged the throat. After
conferring with a supervisor, they agreed that the barrel was not
good, but... could not replace it as the 8x57mm was a limited run
for their Classic calibers and they had no spares. They did however
offer me the option of a new 30-06 or .270 barrel.
Darn, another 30-06 or .270 barrel was
just what I needed! So, I took the unexpected option, and said,
"Just send the rifle back as is".
The next plan is to take the existing
barrel off, set it back and rechamber it hoping to cut thru the bad
throat and clean it up.
While I had the barrel off the action, I
took the time to lap-in the recoil lugs just to be sure of even
contact. I must say they were not too bad to start with, so scratch
up "one" for Remington.
Also while apart, I faced off the front of
the action, just to be sure of a barrel alignment with the threads.
Again, this was not bad, so scratch up another one for Remington.
Now, here we are going to take away the
points accumulated so far. In removing the firing pin from the bolt,
I noticed the spring wrapped around the pin did not fit at all, and
was so bad I could hardly get the spring out of the bolt. So, I
ordered a new firing pin assembly, (non-ISS J-Lock) from Brownell’s
Inc. (http://www.brownells.com/), part number 767-220-400. Ah, this
fit like a glove, and surely is going to help with uniform ignition.
My efforts to clean up the throat were
mostly in vain, as when I set the barrel back .065 (one rotation)
and then rechambered it, only to find it did not clean up very much
of the throat.
Terry
Blauwkamp is a lifelong hunter and a veteran of many
African safaris. His reloading expertise extends beyond
the standard American calibers to metric and classic
African calibers. |
My future plans are to take the 8x57 to
Africa on a plains game hunt in the near future, as it should be
perfect for a walk and stalk hunt in the bushveldt.
Feel free to write anytime with questions to
tblauwkamp@superior-sales.com