Load Data Regarding Velocity and Accuracy

 

The following information comes from the shops at Weaver Rifles as well as submissions from customers and associates. Please remember, all load information is for reference only! Always reduce starting loads by 2-3 grains depending on your rifle, temperature, etc. It is hoped the information here will assist some of you in developing your loads more rapidly and perhaps more accurately.

 

Submissions are welcome

 

 

20-250 Load Data: (Kevin Weaver)

 

Bullet            Powder      Charge            Velocity

40 gr Berger      H380        42                4000

40 gr Berger      IMR 4064    37                4093

50 gr Berger      H380        40                3752

50 gr Berger      Win 760     38                3752

50 gr Berger      IMR 4064    35                3856

 

20 BR Load Data: (Dave Affleck)

 

Barrel is a Douglas, 12T, 26"

Bullets were seated to engage the lands firmly ("square marks") 45 grain

Primers are 205GM's

Group sizes are average of three, five-shot groups

Velocity is average of 15 shots, at 22*F (cold!)

 

N540      31.7 gr.  .415 avg.   3917 fps

N550      32.7 gr.  .590 avg.   3816 fps

Big Game  33.2 gr.  .430 avg.   3737 fps

 

I'd expect all of these to run a bit faster at higher temperatures.  None

of them are hot loads at 22*, so I think they will "probably be okay" when

it warms up.  But I'd advise anyone to approach with caution, as always.

 

20 Bobcat Load Data: (Kevin Weaver)

 

26.0  grains  IMR 4895       3735 ft/sec.

24.0  grains  VV N133        4108 ft/sec. (compressed/most accurate load)

26.0  grains  H322           4158 ft/sec.

22.0  grains  IMR4198        4041 ft/sec.

23.0  grains  H4198          4088 ft/sec.

26.0  grains  Benchmark      4005 ft/sec.

 

RIFLE: Custom with Interarms Action

BARREL: 25” Pac-Nor, 1-12 twist

CASE: Winchester 222

PRIMER: Remington 7.5

BULLET: Hornady 33 grain VMAX

CHRONOGRAPH: Pact, placed 12 feet from muzzle

 

Comparison of 20BR vs 22-250 Remington: (Reprinted from Bob Greenleaf)

              20BR                               22-250 Remington
Bullets 32gr        40gr        50gr        45gr        55gr        69gr
V0      4500        4100        3850        4000        3700        3250
V300    2082        2178        2239        2574        2491        2359
Y300    0           0           0           0           0           0
Y500   -18.9       -19.5       -20.0       -14.5       -25.7       -28.8
Wind    28.6        24.6        21.8        32.1        30.2        26.4
Y800  -124.3      -114.4      -109.6      -159.2      -159.0      -160.0

 

At 600 yards, all drop about 39” from 300 yard zero. The 22 cal bullets drop 54” from the 300 yard zero.

V = velocity in fps

Y = distance in yards

Wind = 10 mph @ 90 degrees

All drop and drift measured in inches

Load data for 20 BR:

 

50 grain bullet       30.0  IMR4895 3,840 fps
40 grain bullet       32.0  AA2520  4,300 fps
32 grain bullet       32.0  AA2520  4,400 fps

These are MAX loads, reduce 2 grains and watch for hard bolt lift.