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.244 Mashburn Loads from Richard Wild

A photo of his 244 Mashburn appears below the load table, along with a recent hunting photo.

The Mashburn Improved .244 is a blown out version of the 6mm Remington with a shoulder angle of 30deg and minimum body taper.  Cases are formed by firing factory 6mm loads in the Mashburn chamber.  According to P.O. Ackley's Handbook for Shooters & Reloaders, Mr. Mashburn states that this is the most powerful 6mm cartridge he has tested which can be fire formed from regular factory cartridges.
Start with 6mm Remington loads from a current load manual and work up.


BULLET
LOAD
POWDER*
GROUP
AV. VELOCITY
S. D.
55 Nos Btip
47.0 gr
AR 2208
0.69
3884
46.7
(b.c. .276)
 48.0
AR 2208
 
4000
 
 
 49.0
AR 2208
 
4200 
 
           
90 BTHP
45.0
AR 2209
0.50
3100
 
(b.c. 0.410)
46.0
AR 2209
0.30
3200
36
 
46.5
AR 2209
0.55
3250
34.6
 
47.0
AR 2209
0.55
3290
84.1
 
47.5
AR 2209
0.52
3315
50.2
 
48.0
AR 2209
0.50
3435
9.2
           
105 A-max
44.5
AR 2209
0.375
3033
36.8
(b.c. .500)
45.0
AR 2209
0.375
3103
21.9
 
45.5
AR 2209
0.75
3106
8.5
 
46.0
AR 2209
0.44
3144
61.5
 
 
 
 
 
 
107 Sierra HPBT 
43.0
AR 2209
-
2924
10.6
(b.c. .527)
44.5
AR 2209
-
3032
18.4
 
45.0
AR 2209
1.20
3058
19.8
 
45.5
AR 2209
1.25
3054
5.7
 
46.0
AR 2209
0.63
3119
6.4
 *Equivalencies:
            AR 2208 is sold in the states by Hodgdon as Varget
            AR 2209 is sold in the states by Hodgdon as H4350

Disclaimer:
Note that these loads work in my rifle.  Any such loads may not work in yours.
You should work yours up accordingly.

Richard's rifle is built on a trued Remington Model 7 stainless steel action.  It has a 2oz. Jewell  trigger, 26in. fluted stainless steel barrel with a 1 in 8 twist and .262 neck.  The scope is a Nightforce 12-42 x 56 on custom 30mm high rings from D & B Supply.  The stock is McMillan.

The primary purpose of this rifle is to compete in long range benchrest matches from 300 to 1000 yds. Nevertheless, varminting at rabbits has never been ruled out.

Note from Mike:  I included this data due to the fact that it is so close to the Ackley version, and it shows another way
to "improve" the 6mm Remington case. Plus, Richard has a heck of a good looking rifle.
 
 
Richard's .257 Roberts Ackley Improved load page
Richard also has loads posted for a .257AI

Here is a hunting pic Richard sent.  A fox called in to 7 yards, and taken with an old English shotgun.


 


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