I just had a rifle fall back into my hands. Originally this Remington 700 was a .222. I had it chambered to .223 as an entry level squirrel rifle for kids. It's a light sporter. Sold it to a friend to finance a divorce many years ago. He was going through his safe, and stuck in the back was this rifle. He decided it doesn't shoot and asked if I would take it back, and gave it to me. It does shoot, but the 1-14 twist doesn't seem to like some of todays longer bullets. Stay 45 grains and less, its decent. I have .223 pretty well covered already, and have decided to turn it into an entry level deer rifle for this generation of kid's. 6mm is minimum legal here, I have a 6mm Remington, and it works, but a smaller rifle/cartridge combo would fit some folks better. Plan is a very lightweight 6.5/223 or 6.5 Grendel, with the Grendel in the lead today. If you've stayed with me this far, What is the shortest barrel length you would use?