L
Lightvarmint
Guest
This is a copy of the letter I sent to RG Henson reporting the results of the HATS in the factory 338 RUM Remington Sendero SF:
RG,
This is for your records.
I finished the factory .338 RUM data and testing today and here are the results for the factory Remington 338 RUM Sendero SF with the 265 HATS. The only modifications on the rifle were the Jewell trigger and the muzzle brake (for obvious reasons). Actually, this barrel did not even come on this gun. It was a take off barrel that I picked up last year and just "screwed in on". Sort of a Johnny Cash setup.
CBS Group (without wind flags)-- .058"
(note: The seating depth for this round was a departure from previous encounters with this bullet in custom barrels. This chambering preferred -.015" from land contact when normally it is -.030"-> -.060" on custom barrels. This seating depth preference was proved three times during testing to be the preferred length for both the barrel and the bullet. Finally, the .058" was the very best group that it shot at that depth and powder charge. The other two were slightly over .100").
Velocity-- 2955 fps
Velocity spread-- 5 fps
The velocity spread and speed resembles a HAT 180 grainer out of a 24" factory 300 Win Magnum Remington Sendero, but the impact energy is more along the line of a 300 Win magnum on a lot of steroids!
Crunching the numbers (using the most conservative BC of .900) and comparing it to known velocities for the 300 Sierra Match King out of several of the same model rifles:
The 338 RUM with your bullets travels 235 fps faster and delivers 490 ft-lbs more energy at 1000 yards with 53.09" less drop. It really makes it a forgiving factory package when long range hunting under less than desirable conditions when shots can come faster than you would like. Remember that we know the BC is always higher than .900 so the down-range performance will be more impressive.... FWIW, I prefer to use the conservative BC values to minimize/eliminate any possible consternation from the unwashed masses.
I am in hot standby for the final .30 cal testing as well as the ground-breaking .224, 6mm, 7mm 375, 408, and 416 testing. Almost forgot, when are you sending me the 280 and the 300 grain .338 test bullets?
James
RG,
This is for your records.
I finished the factory .338 RUM data and testing today and here are the results for the factory Remington 338 RUM Sendero SF with the 265 HATS. The only modifications on the rifle were the Jewell trigger and the muzzle brake (for obvious reasons). Actually, this barrel did not even come on this gun. It was a take off barrel that I picked up last year and just "screwed in on". Sort of a Johnny Cash setup.
CBS Group (without wind flags)-- .058"
(note: The seating depth for this round was a departure from previous encounters with this bullet in custom barrels. This chambering preferred -.015" from land contact when normally it is -.030"-> -.060" on custom barrels. This seating depth preference was proved three times during testing to be the preferred length for both the barrel and the bullet. Finally, the .058" was the very best group that it shot at that depth and powder charge. The other two were slightly over .100").
Velocity-- 2955 fps
Velocity spread-- 5 fps
The velocity spread and speed resembles a HAT 180 grainer out of a 24" factory 300 Win Magnum Remington Sendero, but the impact energy is more along the line of a 300 Win magnum on a lot of steroids!
Crunching the numbers (using the most conservative BC of .900) and comparing it to known velocities for the 300 Sierra Match King out of several of the same model rifles:
The 338 RUM with your bullets travels 235 fps faster and delivers 490 ft-lbs more energy at 1000 yards with 53.09" less drop. It really makes it a forgiving factory package when long range hunting under less than desirable conditions when shots can come faster than you would like. Remember that we know the BC is always higher than .900 so the down-range performance will be more impressive.... FWIW, I prefer to use the conservative BC values to minimize/eliminate any possible consternation from the unwashed masses.
I am in hot standby for the final .30 cal testing as well as the ground-breaking .224, 6mm, 7mm 375, 408, and 416 testing. Almost forgot, when are you sending me the 280 and the 300 grain .338 test bullets?
James