243 Winchester Nosler Loads in the Bergara BA13
After yesterday’s drizzle, today dawned clear and sunny; the sky and terrain crisp and fresh after a much-needed bath. The conditions were ideal for testing loads at the range.
Nosler Ballistic Tips, Accubonds and Partitions
All my loads of these three Nosler Projectiles were at the same powder charge determined from the previous testing; that is 47.0 grains of AR2213SC (H4831SC in USA). The projectiles were loaded over a range of seating depths, moving from about 30 to 150 thou off the lands in 30 thou increments.
I did not bother to set up my Chrony, as I had a good suite of MV measurements for this powder charge from my last range session. Another variation today was that I adjusted the sighting as I went. My goal for that day was to determine which was the best hunting load and finish the day with the rifle sighted in for that.
Accuracy Test Results
The results were pleasing and, again showed largely what I have seen before in other calibres. That is, for best accuracy, the Nosler Ballistic Tips and Accubonds like to be seated reasonably close to the lands, while the Partitions come into their own well clear of the lands. Graphs of today’s result are shown below.
It looks like my best choice for an appropriate hunting load in the Bergara BA13 243 Winchester rifle is an 85 grain Nosler Partition, loaded with 47.0 grains of AR2213SC (H4831SC in USA) over a Federal Premium Magnum Match primer and seated to be 130 thou clear of the lands. In the 20” barrelled Bergara BA13 this delivers a muzzle velocity of about 3,070 fps. I will load a small batch of these and the next test is in the field, hunting boar, wild dogs or deer. From the range results, and my perceptions in having handled and shot the Bergara BA13, I am confident this is going to prove to be a sweet little stalking rifle.
As always, for any readers interested in replicating this loading, you must start at the recommended starting charge (45.0 grains) and work up carefully because no two rifles are the same. What may work fine in one rifle may well be dangerous in another.
Trail Camera Action
After processing the data from today’s range session, and taking a few supporting photos, I made a quick trip to swap out my trail camera card and batteries, then sit over the carrion until dusk. Nothing came to the carcass and when it was too dark to shoot I returned home. The camera photos reveal plenty of ongoing activity with a pied boar visiting at night and a big black dog just on first light yesterday, during the rain.