American Rifleman - December 2020 - 61

SHOOTING RESULTS: 6

s.

X.

s

n

CREEDMOOR (100 YDS.)

Cartridge Length
(inches)

Velocity
(f.p.s.)

100-Yd. Group
(inches)

Hornady V-Max/75
Big Game/44.5

2.60

3428

0.74

Sierra Tipped GameKing/90
Hunter/45.0

2.74

3117

1.04

Nosler Partition/100
MRP/44.0

2.65

2852

1.60

Hornady ELD-X/103
Superformance/44.5

2.73

2917

1.42

Bullet Brand/ Weight (grs.)
Propellant Brand/Charge (grs.)

or

.

mm

The 6 mm Creedmoor (r.) is a touch longer
than the .243 Win. (l.), and is designed
to better handle long bullets.

bullet at 3000 f.p.s. and the 90-gr. at
3100 f.p.s., trajectories are the same
for both out to 400 yds. The heavier
bullet does carry an additional 200
ft.-lbs. of energy than the lighter bullet from the muzzle to 400 yds.
The 103-gr. ELD-X fits neatly into
Creedmoor cases, its base situated
half way down the shoulder, with
the Creedmoor's maximum cartridge
length of 2.80." The bullet fails to fit
within a .243 Win. case. With a maximum cartridge length of 2.71", part of
the bullet's ogive rests within the case
neck, and its base protrudes deeply
into the case's propellant space.

Propellants

The Creedmoor case contains lots
of space for propellant, with the base
of the bullets seated at the bottom
of the neck or slightly deeper. Only
maximum amounts of propellants such
as cylindrical H1000 and IMR 4831
are compressed when seated under
relatively long bullets.
Hunter, Hybrid 100V, H4350,
Superformance and Reloder 17 were
stand-out propellants in accuracy and
uniform velocities several years ago
when I handloaded the 6 mm Creedmoor
for the JP Enterprises LRP-07. I played
it by ear by increasing propellant
weights one grain at a time to develop
loads, since no specific handloading
information was available. Fairly well
across the board, extreme spreads of
velocity shrank as weights increased.
For example, velocity spread decreased
with Berger 105-gr. VLD bullets from
89 f.p.s. with 39.0 grs. of Norma 204, to
33 f.p.s. with 40.0 grs. and only 9 f.p.s.
when burning 41.0 grs.
From the start, shooting the Ruger

Notes: Velocities are the average of nine shots recorded by a Chrony Beta Master
chronograph 10 ft. in front of the muzzle of the 22" barrel of a Ruger American
Predator rifle with a 1:7.7" rifling twist. Accuracy is the average of five consecutive,
three-shot groups at 100 yds. with a Leupold Freedom 3-9X 40 mm scope, set on
9X. Handloads were assembled with Hornady cases and Remington 9½ Large Rifle
Primers. Temperature varied between 32° F and 45° F.
WARNING: Technical data and information contained herein are intended to provide information
based upon the limited experience of individuals under specific conditions and circumstances. They
do not detail the comprehensive training, procedures, techniques and safety precautions that are
absolutely necessary to properly carry on similar activity. READ THE NOTICE AND DISCLAIMER ON THE
CONTENTS PAGE OF THIS MAGAZINE. ALWAYS CONSULT COMPREHENSIVE REFERENCE MANUALS
AND BULLETINS OF PROPER TRAINING REQUIREMENTS, PROCEDURES, TECHNIQUES AND SAFETY
PRECAUTIONS BEFORE ATTEMPTING ANY SIMILAR ACTIVITIES.

American Predator rifle, Big Game
and Hornady 75-gr. V-Max bullets
were a perfect match. The first three
shots from the trio landed in a 0.90"
group, with 4 f.p.s. of velocity spread.
Accuracy improved from there, with a
0.74" average for five, three-shot groups
and 29 f.p.s. extreme spread of velocity
for 15 shots. Hunter paired with Sierra
90-gr. Tipped GameKing bullets also
worked right from the start. Matching
suitable propellants to Nosler 100-gr.
Partitions and Hornady 103-gr. ELD-X
bullets required some experimenting.
Reloder 17, Hybrid 100V and H4350
fired Partitions at about 2950 f.p.s.
with extreme spreads of velocity hovering around 20 f.p.s. But bullets hit
here and there across the targets. At
long last, Norma MRP shrank groups
to an acceptable size, although velocity was a bit slow.
Initially, ELD-X bullets strung vertical 3" to 4" groups shot with Hunter,
Reloder 19 and Superformance-but not
with each succeeding bullet continually
climbing as if there was a bedding problem. Bullets were seated for a cartridge
length of 2.790", which Hornady lists
for the bullet. In desperation, I continued with Superformance but seated
bullets a touch deeper for a cartridge
length of 2.730". That seemingly minor
change made a big difference, and bullets started printing nice, round groups.
The 6 mm Creedmoor (far r.) is shown here
in comparison to: (l. to r.) the 6 mm Rem.,
.243 Win., .243 WSSM and 6 mm HAGAR.
americanrifleman.org

or

R2012_BENCH.indd 61

Case stretching and case trimming
were not much of a concern with
the Creedmoor. A batch of Hornady
Creedmoor cases measured 1.915"
after having been fired several times.
Those cases measured 1.916" after
they had been sized to bump back the
shoulders and slightly narrowed the
case body. In contrast, the .243 Win.
has nearly twice the case body taper
and a more relaxed 20-degree shoulder
than the Creedmoor. Fired .243 Win.
cases received the same sizing treatment, and they lengthened by 0.004"
to 0.006".
In the end, the 6 mm Creedmoor
fairly well mirrors the velocity attained
by the .243 Win. Like the .243, the
Creedmoor shooting varmint bullets
will be a great cartridge for coyote
hunting, and for hunting big mule deer
with Nosler Partitions. The Creedmoor's
fast rifling twist, though, somewhat
extends shooting range by handling
long and streamlined bullets such as
the Sierra 95-gr. Tipped MatchKing and
Hornady 103-gr. ELD-X.
So, I guess I have to say, "Welcome
to the family, 6 mm Creedmoor."

December 2020

10/8/20 1:58 PM


http://www.americanrifleman.org

American Rifleman - December 2020

Table of Contents for the Digital Edition of American Rifleman - December 2020

Contents
American Rifleman - December 2020 - C1
American Rifleman - December 2020 - C2
American Rifleman - December 2020 - 1
American Rifleman - December 2020 - Contents
American Rifleman - December 2020 - 3
American Rifleman - December 2020 - 4
American Rifleman - December 2020 - 5
American Rifleman - December 2020 - 6
American Rifleman - December 2020 - 7
American Rifleman - December 2020 - 8
American Rifleman - December 2020 - 9
American Rifleman - December 2020 - 10
American Rifleman - December 2020 - 11
American Rifleman - December 2020 - 12
American Rifleman - December 2020 - 13
American Rifleman - December 2020 - 14
American Rifleman - December 2020 - 15
American Rifleman - December 2020 - 16
American Rifleman - December 2020 - 17
American Rifleman - December 2020 - 18
American Rifleman - December 2020 - 19
American Rifleman - December 2020 - 20
American Rifleman - December 2020 - 21
American Rifleman - December 2020 - 22
American Rifleman - December 2020 - 23
American Rifleman - December 2020 - 24
American Rifleman - December 2020 - 25
American Rifleman - December 2020 - 26
American Rifleman - December 2020 - 27
American Rifleman - December 2020 - 28
American Rifleman - December 2020 - 29
American Rifleman - December 2020 - 30
American Rifleman - December 2020 - 31
American Rifleman - December 2020 - 32
American Rifleman - December 2020 - 33
American Rifleman - December 2020 - 34
American Rifleman - December 2020 - 35
American Rifleman - December 2020 - 36
American Rifleman - December 2020 - 37
American Rifleman - December 2020 - 38
American Rifleman - December 2020 - 39
American Rifleman - December 2020 - 40
American Rifleman - December 2020 - 41
American Rifleman - December 2020 - 42
American Rifleman - December 2020 - 43
American Rifleman - December 2020 - 44
American Rifleman - December 2020 - 45
American Rifleman - December 2020 - 46
American Rifleman - December 2020 - 47
American Rifleman - December 2020 - 48
American Rifleman - December 2020 - 49
American Rifleman - December 2020 - 50
American Rifleman - December 2020 - 51
American Rifleman - December 2020 - 52
American Rifleman - December 2020 - 53
American Rifleman - December 2020 - 54
American Rifleman - December 2020 - 55
American Rifleman - December 2020 - 56
American Rifleman - December 2020 - 57
American Rifleman - December 2020 - 58
American Rifleman - December 2020 - 59
American Rifleman - December 2020 - 60
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American Rifleman - December 2020 - 62
American Rifleman - December 2020 - 63
American Rifleman - December 2020 - 64
American Rifleman - December 2020 - 65
American Rifleman - December 2020 - 66
American Rifleman - December 2020 - 67
American Rifleman - December 2020 - 68
American Rifleman - December 2020 - 69
American Rifleman - December 2020 - 70
American Rifleman - December 2020 - State_1
American Rifleman - December 2020 - State_2
American Rifleman - December 2020 - 71
American Rifleman - December 2020 - 72
American Rifleman - December 2020 - 73
American Rifleman - December 2020 - 74
American Rifleman - December 2020 - 75
American Rifleman - December 2020 - 76
American Rifleman - December 2020 - C3
American Rifleman - December 2020 - C4
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