Hello all, been catching your threads online in research for some time and decided to join.
Ok, so first some background. I'm a numbers guy. I love math. I'm a 42 year old L1 ASE Master auto tech and own an auto repair shop. I absolutely love the 22 lr platform and am mostly a target shooter. I have several 10 22s that are well built for specific purposes and a couple of 22 pistols as well.
I've tested over 20 different kinds of ammo with different rifles for varying distances. My personal favorite over thousands of rounds of testing is the CCI AR Tactical. For overall accuracy and dependability I find that these are the best. Granted all three of my test rifles are 10 22s, but they range from nearly stock to full custom.
My recent adventure is stretching what some consider the usable range of the 22lr. To give you an idea, we are shooting pingpong balls off golf tees at 350 feet with a 10 22 with a 17 inch Majestic barrel using 1200 fps ARTactical ammo. Granted, I weigh my ammo and separate it by .1 grain increments. I have a rim gauge but I've found rim variation to be nearly insignificant.
In order to stretch the range of these rounds I've gone to testing hypervelocity rounds. What I've found is that they just don't group well. But I know why. These hypervelocity rounds are smaller. The standard 1/16 twist barrel is over spinning them. Using the modified Greenhill Equation, I find that these shorter rounds require a slower twist rate.
Now, Green Mountain makes a 1/18 twist "Stinger barrel", but that barrel is heavy, and I like my rifles light. So after contacting several different barrel makers, I found one willing to make me a slower twist aluminum barrel. For the blanks he had available I couldn't, get a 1/18. What he could get was a 1/20, which is what is used for 22 shorts. Look at the grain weight of a 22 short vs a hypervelocity 22lr. Pretty close, huh?
So, I've done a lot of testing so far and still have some to do. Just wanted to know if anybody else might want to get in on this discussion. I'll tell you this: I just outfitted that custom rifle. With a 20MOA drop scope mount because I ran out of adjustment on my 24x scope at 150 yards and I'm still grouping pretty well with what I consider to be subpar ammo.
Ok, so first some background. I'm a numbers guy. I love math. I'm a 42 year old L1 ASE Master auto tech and own an auto repair shop. I absolutely love the 22 lr platform and am mostly a target shooter. I have several 10 22s that are well built for specific purposes and a couple of 22 pistols as well.
I've tested over 20 different kinds of ammo with different rifles for varying distances. My personal favorite over thousands of rounds of testing is the CCI AR Tactical. For overall accuracy and dependability I find that these are the best. Granted all three of my test rifles are 10 22s, but they range from nearly stock to full custom.
My recent adventure is stretching what some consider the usable range of the 22lr. To give you an idea, we are shooting pingpong balls off golf tees at 350 feet with a 10 22 with a 17 inch Majestic barrel using 1200 fps ARTactical ammo. Granted, I weigh my ammo and separate it by .1 grain increments. I have a rim gauge but I've found rim variation to be nearly insignificant.
In order to stretch the range of these rounds I've gone to testing hypervelocity rounds. What I've found is that they just don't group well. But I know why. These hypervelocity rounds are smaller. The standard 1/16 twist barrel is over spinning them. Using the modified Greenhill Equation, I find that these shorter rounds require a slower twist rate.
Now, Green Mountain makes a 1/18 twist "Stinger barrel", but that barrel is heavy, and I like my rifles light. So after contacting several different barrel makers, I found one willing to make me a slower twist aluminum barrel. For the blanks he had available I couldn't, get a 1/18. What he could get was a 1/20, which is what is used for 22 shorts. Look at the grain weight of a 22 short vs a hypervelocity 22lr. Pretty close, huh?
So, I've done a lot of testing so far and still have some to do. Just wanted to know if anybody else might want to get in on this discussion. I'll tell you this: I just outfitted that custom rifle. With a 20MOA drop scope mount because I ran out of adjustment on my 24x scope at 150 yards and I'm still grouping pretty well with what I consider to be subpar ammo.