fourfive8
AH legend
- Joined
- Apr 27, 2017
- Messages
- 4,340
- Reaction score
- 10,167
- Media
- 261
- Hunted
- USA, South Africa, Mozambique, Zimbabwe, Zambia, Botswana
Usually you can come pretty close to factory ballistics but not always. The chronograph is your friend for developing loads and approximating ballistics. Learning to develop loads using standard deviation of velocity with the chronograph is well worth the effort. If nothing else just record your vels on a piece of paper. Use an online standard deviation calculator and presto. You only have to do it once for any load. If Factory is your standard, you can shoot some of your favorite factory rounds for a baseline. Use caution approaching their numbers. Factories have in house labs or use contract labs with pressure equipment to develop loads. No two rifle chambers or bores are the same and that goes for the pressure testing guns used in the labs that develop the published data you see. Learn to identify high pressure signs and watch the chronograph numbers.
A few of my hunting rifles will easily exceed factory velocity ballistics with certain powders. But for hunting loads I prefer the conservative approach with the highest priority being 100% reliable ammo. For example I have a couple of Win 70s in 416 Remington Mag. Both late New Haven. They might as well be twins. I can easily exceed 400 gr factory velocities with each. But, 100% reliability is the goal permanently set in my mind for hunting ammo. I picked a temperature insensitive powder like Varget and an objective velocity of 2350 fps. That proved to be an easy work up and easy objective to reach, very accurate with Barnes TSXs, monolithic solids and Swift A-Frames. No high pressure signs- what's not to like about it.
I have this orange bull dot in with my first buffalo pic as a reminder. The PH set up this dot at about 50 yards so I could check my rifle- one of the Win 70s 416 Rem Mag. 400 gr Swift A-Frame 2350 fps Varget. I leaned over the hood padded with jackets and shot once. He checked the hole and walked back to the cruiser... all grins.
A few of my hunting rifles will easily exceed factory velocity ballistics with certain powders. But for hunting loads I prefer the conservative approach with the highest priority being 100% reliable ammo. For example I have a couple of Win 70s in 416 Remington Mag. Both late New Haven. They might as well be twins. I can easily exceed 400 gr factory velocities with each. But, 100% reliability is the goal permanently set in my mind for hunting ammo. I picked a temperature insensitive powder like Varget and an objective velocity of 2350 fps. That proved to be an easy work up and easy objective to reach, very accurate with Barnes TSXs, monolithic solids and Swift A-Frames. No high pressure signs- what's not to like about it.
I have this orange bull dot in with my first buffalo pic as a reminder. The PH set up this dot at about 50 yards so I could check my rifle- one of the Win 70s 416 Rem Mag. 400 gr Swift A-Frame 2350 fps Varget. I leaned over the hood padded with jackets and shot once. He checked the hole and walked back to the cruiser... all grins.
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