600 NITRO EXPRESS

The following data was developed in a HEYM Express bolt action rifle. It has a 24-inch barrel. The weight of the rifle was 12.8 pounds. It has open sights and the receiver is drilled and tapped for scope mounts.

We could not help comparing this rifle to the A-Square Hannibal in 577 Tyrannosaur. Which we have here. Both are very large, heavy rifles. Both are extremely specialized, but not surprisingly, the Heym 600 Nitro Express handles a lot better than the A-Square 577 Tyrannosaur. This is purely a personal preference, but all shooters that have handled these rifles prefer the stock on the Heym.

We do not have any facility for checking the pressure of our ammunition. None of the loads fired showed any signs of excessive pressure. But please bear in mind that this a modern bolt action rifle, which would probably handle higher pressure much better than any old double rifle. Also in a double, one of the main concerns is "regulating" both barrels to shoot to the same point of impact. In the past we have used IMR3031 for double rifles such as 470 Nitro Express. With this powder we were able to duplicate the velocity of some original factory loads and get them to regulate well.

We used the Barnes and Woodleigh 900-grain solid bullets and the Federal 215 primer in all the following loads. The brass was made by B.E.L.L. in 1986. The rim on the cases was too large in diameter for this rifle. Original rim diameter for a 600 Nitro Express is 0.805" Apparently this was too large to go through the front part of the receiver into the barrel! We had to turn the rims down to 0.777".

POWDER AND CHARGE

VELOCITY

ENERGY

     

155 H4831

1837

6745

160

1886

7110

140 VVN 550

1969

7750

145

2069

8557

150

2136

9120

155

2186

9552

160

2247

10093

145 W 760

1823

6643

150

1890

7140

145 RELOADER 15

2096

8782

150

2185

9543

160 H 4350

2014

8110

170

2180

9500

165 VVN 550

2130

9070

170

2193

9610

175

2260

10210

178

2295

10530

     
     

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Last updated 27 April 1999