I have an old model tube fed Ruger 44 carbine and a Deerfield. Everyone seems to think the 240 and over grain bullets work the best. I have some 180 Remington and some 200 grain Fiocchi that are pretty hot. Muzzle velosities are considerably higher.. That gets me to the twist rate. I know each gun is different but the design was probably considering 240's for the most part. I have not had a chance to test them yet because I am waiting on my scopes to arrive. But what is Y'all's opinion in this regard? This ammo shoots great in my 4" barrel pistol.