I'm going to be hand-loading cartridges for my Handi. It is currently chambered for .223 Remington with the faster barrel, I believe it's a 1 in 9 twist.
I'm looking for a load which will be good for killing paper out to 300m. Not considering using it for anything more than killing paper. I'm considering switching to .17 Hornet, but I'm afraid of wind characteristics at 300m.
I'm relatively certain I want to stick with .224/5.7mm bullets, as the plethora available should give me years of playing. I'm thinking I'm wanting 68-75g bullets and wanting close to 3000ft/s velocities. This is an uneducated guess.
I've found a few cartridges which look like they'll perform well and can either be formed to the chamber, or have the chamber reamed to the new cartridge: .222-rimmed, 5.6x50R, 5.6x57R.
Does anyone have any experience with similar cartridges and have a suggestion as to where I can find more information on this?