Northern wrote: Mon Mar 20, 2023 12:21 pm
To return to the point about sight regulation, I didn’t see any evidence, when shooting various .38 spl loads this weekend, that the sights were regulated by Kimber for some sort of extra powerful Buffalo Bore .357 load, as was discussed in some reviews of the K6S from the earlier days of its production. I’ll explore further but it wasn’t hitting low at 15 yards as would be expected if the earlier sight regulation comments remained true. Like a lot of internet stuff, it may be outdated yet continues to be echoed.
I don't have the receipts on this, as they say, because I'm too lazy to keep good notes and I have the memory of an alcoholic toddler, but my experience in handloading a wide range of bullet weights and velocities in revolvers is that, unless you are talking about distances at which trajectory actually matters, meaning more than 50 yards, bullet weight affects point of impact more than velocity. My observation was that light, slow bullets hit lower than either heavy, slow bullets or heavy, fast bullets. (I don't usually shoot light, fast bullets out of revolvers, but the few I've used also went low, IIRC.) My GP100 has fixed sights and pretty much all 158 grain loads hit close enough to the same place at 50 feet, if you're not scoring Bullseye targets. 125s go quite a bit lower.
This makes sense to me, because at a given bullet weight, a hot load accelerates the bullet AND the gun more than a light load. The bullet leaves the gun sooner, but the gun rotated faster so the angle of muzzle climb isn't much different.
Of course, if you grip the gun harder when using a hot load than a light load, you've introduced a new variable. If you've actually stiffened your hands, wrists, elbows, etc, I'd expect the hot load to hit lower.
IMR4227: Zero to 900 in 0.001 seconds
I'm only killing paper and my self-esteem.