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rimfire headspace comparisons I found by using a .223 Remington case,you can compare and actually measure rimfire rim thickness. Just insert the rimfire cartridge into "fired" .223 case and measure. works great. gpoldblue@yahoo.com

10/22 4 Benchrest......... DON"T!!!! I built a 10/22 benchrest rifle. Spent a lot of money and time. Benchrest stock,heavy barrel,custom 6oz. trigger,scope,etc. These 10/22's are VERY ammo speed sensitive. Bolts don't lockup square. You "can" make one shoot,but it's alot of trouble. Have shot...

6mmPPC case length Hank-6mmPPC case length of 1.543" is WAY too long. Case mouths are being "jammed". 1.515" is a good length to trim to. If you get new Lapua .220 Russian brass,you'll find it approx. 1.515" before doing anything to it. For now,I would recommend trimming to 1.515"-even 1.500"...

N133/H322 comparison I live in Jax,Fla so we don't have the temp swings you describe. Ours are generally 20-30 degree(F). I read read your article w/ great interest and really appreciate your very time consuming effort. I now have more to consider. I shoot H322 and my brother shoots N133 in our...