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A friend with a chronograph was at the range today. I chronoed my 348 load using 64.5 gr. of R19.
Here are the results.
Highest Velocity = 2270
Lowest Velocity = 2260
Max spread = 10 fps
Standard Dev = 5 fps
Mean Velocity = 2265
Given, I have a carbine, not a rifle. And, I am still 1/2 grain under the "max" of 65 grains. But this still makes the 2506 fps reported in Handloader kinda far fetched in my rifle. I was hopin' to break 2450, loping off 50 fps for the short barrel. As it turned out, I think I may get over 2300 by crankin' it to 65 grains, but that's still 150 fps slower than I had hoped. Didn't check other loads, cause I was so enamoured with this load's 1-1/4" groups. Might just have to buy a chronograph. Or, on second thought, maybe ignorance is bliss. Imagine the problems I might encounter with my other pet loads for my other rifles. So much for believing published velocity data.
Here are the results.
Highest Velocity = 2270
Lowest Velocity = 2260
Max spread = 10 fps
Standard Dev = 5 fps
Mean Velocity = 2265
Given, I have a carbine, not a rifle. And, I am still 1/2 grain under the "max" of 65 grains. But this still makes the 2506 fps reported in Handloader kinda far fetched in my rifle. I was hopin' to break 2450, loping off 50 fps for the short barrel. As it turned out, I think I may get over 2300 by crankin' it to 65 grains, but that's still 150 fps slower than I had hoped. Didn't check other loads, cause I was so enamoured with this load's 1-1/4" groups. Might just have to buy a chronograph. Or, on second thought, maybe ignorance is bliss. Imagine the problems I might encounter with my other pet loads for my other rifles. So much for believing published velocity data.