This has been bothering me for a while and I hope someone can clear this up for me: I have read in multiple places that shooting 40 grain lead nose ammo through a Ruger 10-22 is a bad idea. I've read probably 4 or 5 forums saying that the twist rate in the barrel is not high enough. I have an older model 10-22; not sure exactly when it was made but my dad had a couple & gave them to me & my brother. I've shot probably 50 rounds of Aguia 40 grain through mine & I don't see any issues. Can someone confirm or debunk this myth? Of course, my 22A S&W & Chiappa 1911-22 love the 40 grains...not surprising. Thanks in advance all.