Yes I would agree with what you’re saying But my eyes are seeing different. It’s like deer jumping the string on a recurve vs. not so much with a compound bow. That’s a couple hundred feet per second difference too At 40 yards Or less. Now the animals are hearing the shot and react to that. A cowbird is just a little bigger than a sparrow so the kill zone is like the size of a quarter. These cowbirds jump at the sound so they do have a little head start and don’t have to move but 1/2” to be out of the kill zone as well just like a deer which has a much larger kill zone and they can drop 8 to 10” before an arrow gets to them at 200 fps. I filmed a blind hunt in South Africa where a friend tried to shoot a nyala antelope on a food plot at 30 yards. He had a 60 pound pull recurve bow. 4 times in a row (different days) the antelope jumped the string as they say. We played back the video and it was amazing how far it dropped before the arrow got there. Our guide said even with compound bows the animals are so wired to sudden noises that a good vital hit is hard to get. I think I have been shooting at the same birds over the feeder so much they are anticipating the shot. I have a DFL Ronin moderator but I don’t think a quieter moderator would help any.50fps doesn't make much difference. It might just be coincidence but according to chairgun your talking a difference of .007 seconds. 910fps is .140 seconds and 860fps is .147 seconds with 25.4gr. 910fps with 15.9gr is .145 seconds. So only .002 between your 860fps 25.4gr and 910fps 15.9gr. No way that makes that much difference. I've killed thousands of birds and even at 640fps 14gr tuned .22s have no problem with birds jumping the gun at 40yds. I'm not sure what the problem is but there not jumping the gun with only .002 seconds more time.
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