Would a 340 arrow shoot that different from a 300? I shot 340s in an bow that was 29/70. Got a newer bow that is 29/67 (but a little faster than the older bow) and it came with 300s and they do shoot good. Just have an abundance of 340s and they are also easier to come by it seems. Of course, I know, if it ain’t broke, don’t fix it! Just wanted opinions from knowledgeable folks and if you get too technical I won’t know what the h3ll you’re talking about .