The draggier round nose will drop more and at the ranges we were shooting (up to 400yds) the drop is substantially higher with the round nose. It does make a big difference in ballistics. What I found is that it doesn't seem to make much difference in subsonics what shape the nose is for killing things. I have fired 200gr round nose in the 30-221 thinking they would be better for putting holes in game that would kill them quicker than the spitzer types. It took me a bit to see that you were asking for 220RN info but I did finally see it. If you're only shooting out to 300 it may not make much difference. The only problem with them is that they have more drag and slow down quicker so they don't have the range the slicker HPBT's do. The round nose bullets are normally much shorter and need less spin to remain stable. On the other hand if you want to toss the round nose 220 you would likely be fine. We are shooting 30-221, 300 whisper, 300 blackout using twist rates of 7-8 inchs in order to stabilize these long heavies so 10in isn't really there. Sticking with the lighter bullets for you would make sense from that standpoint. I've done some repairs on suppressors used with that bullet and twist in common. On the other hand the heaviest bullet may not stabilize and I think with a 10 in twist you're on the edge with a 220 gr bullet with a pointy end and a boattail. Because of that the advantage in the subsonics is normally with the heaviest bullet you can throw. The whole point behind subsonic shooting is to retain as much energy as possible while reducing noise.
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