Author: Goosic
Subject: 303 British Brass Options?
Posted: December 15 2023 at 8:40am
I have been using the VihtaVuori N540 going on 4 years now and have yet to discover any higher than normal deviations with reduced powder charges, especially when used for target shooting using the .243W. In fact, I had noticed a definitive incline in accuracy with the reduced charge weight. I have a reason to believe that the 6mm projectile is destabilizing at the 3200 FPS velocities and causing the adverse effects in accuracy.
Subject: 303 British Brass Options?
Posted: December 15 2023 at 8:40am
I have been using the VihtaVuori N540 going on 4 years now and have yet to discover any higher than normal deviations with reduced powder charges, especially when used for target shooting using the .243W. In fact, I had noticed a definitive incline in accuracy with the reduced charge weight. I have a reason to believe that the 6mm projectile is destabilizing at the 3200 FPS velocities and causing the adverse effects in accuracy.
When I tested the N540 against IMR4064, IMR4895, and IMR3031 using 174grn .311 projectiles, I notated that reducing the N540 charge 1.5grns lower than the 39.5grns of the Improved Military Rifle powder produced significant gains in accuracy while maintaining a very stabilized FPS with a plus or minus of only 12-15 FPS which greatly improves the odds when hunting.
The other advantage is that when used for deer hunting, you definitely are not going to erode the throat out of your rifles barrel using the N540 powder...