I can't help you with the .17 Remington loads, but I do know that the .17 Mach IV works very well on coyotes. I've only taken 3 this winter, out to about 225yds, but it drops them as well as the larger varmint rounds. The .17 Mach IV out of a 20 in TC Carbine barrel makes very near the same velocity as the .17 Remington, if there is any difference at all, and burns a less powder and throat. I've had very good luck in my early experimentation with the 25gr Bergers.
Yote, I have had my T/C .17 Rem Carbine for about 12 years. I have not found the optimum yet, but I can tell you that AA 2460 and H-335 are vastly erratic over a chronograph( after getting bad velocities and accuracy with medium powders I stashed it in the back of the safe for a few years). After I got over my dislike with the little P.I.T.A., I have recently continued my experimentation with it. I am trying H-380 now with Mag and Reg. primers and shooting sub MOA at 3700fps. Not as fast as I would like it to be, but the coyotes I shoot don't care how fast that pill travels. So far I am under the impression that my gun does not like partial loading densities. The fuller the case, the closer the numbers over the Chrono. I am getting ready to try IMR4320 as history suggests and will advise with my findings. When I lived in S. New Mexico, even with the erratic ammo, I found the .17 to be extremely devastating on coyotes. But then again, you don't need MOA when you call them up into your lap.
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