THE HANDLOADING BENCH


308 Winchester Rides Again Part 2 By Laurie Holland


LAPUA ‘PALMA’ v STANDARD BRASS: 155gn Lapua Scenar / Viht N140 Muzzle Velocities Palma


45.5gn 2,897 45.8gn 2,925 46.1gn 2,947 46.3gn 2,948 46.5gn 2,968


Standard LRP 2,913 2,947 2,964 2,974 2,990


Difference - 16 fps - 22 - 17 - 26 - 22


Velocity Spreads Palma 38 25 26 20 53


Standard LRP 12 13 13 40 14


Difference + 26 + 12 + 13 - 20 + 39


The Berger 185gn BTLR/Viht N550 tests were carried out on a different day, 6th January 2011 and my notes record the conditions as cold (now 2°C) with virtually no wind. Three groups were shot with the leftover match ammo and averaged 0.5”; 2,766 fps MV; 40 fps ES; 12 fps SD. That wasn’t a great result and there were two possible causes. These rounds had been loaded six months before and sitting that long rarely does much for performance. Also, I reckon the low temperature had an effect, at the very least the average MV was some 35 fps down on what it had been the previous summer, and this could also have affected the other results adversely.


A key question with the Palma brass and SRPs was how it would perform on winter days such as this one at Diggle. Frost still rimes the valley floor on a cold January morning as a morning relay of TR and F Class competitors finish.


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