Acouple years ago had 30-06's build one use a Bartlein 1/11twist 5r barrel next one a 1/11 twist Lilja next one used a Shlein 1/13 twist Ratchet barrel and that rifle I didn't plan on shooting anything heavier than 168gr bullets. Accuracy from The Shilen barrel was equal to the other rifles same gunsmith was used.
Lets just say all three barrels gave better than published velocity using published reloading data. Last year I used the Shilen barrel 30-06 on a late cow elk hunt with 150gr Nolser E-Tip.
Bluedot, I've been shooting the 223AI over 10yrs now and my 27.5" long 1/14 twist Hart barrel with 31gr/H-335 alittle over 3900fps and that's max in that rifle. I normally shoot 50/52gr been using surplus 8208 high 3600 to 3700fps range in both 223AI.
Tom H, I started with H335, shot very well, good velocities, tried TAC just cuz, shoots just as well, gives me same velocities but it WAY cleaner, takes about half the effort to clean up after a day of wackin p dogs
I read that AA2015 was pretty decent in the 223 AI also, I haven't had a good calm day to shoot my test loads but I did work up some velocity ladders and 2015 gave velocity right up there with TAC. But Iwon't be switching unless they shoot much better.
I'm getting 3940-4030 fps with 40's and 3650-3700 fps with 50's.
This is my first 223 AI and I'm absolutely thrilled, gives velocity with 40's and 50's within 50 fps of my old 22-250, creates much less barrel heat and is easily 250 fps second faster than my 24" 223 cooper.
I have a 5R coming next week from Bartlein for my new 300 Sherman. I have heard some reports of higher velocities and a consensus that they clean much easier than std. rifling (as far as copper fouling goes) Good luck.......Rich
A pic is worth a thousand words, here's Shilens' web with a good pic. www.shilen.com/ratchetRifle.html Button rifling is a manufacturing method. the button is either pushed or pull thru a reamed and polished hole to form the lands and grooves. "Cut" rifling is another manufacturing method where each groove is cut, individually, with a cutter. Broached rifling is another manufacturing method that uses a cutter called a broach which is pushed or pull thu the reamed and polished bore and cuts all the grooves at the same time. Hammer forging is another method, mostly used in Europe (someone correct me if I'am wrong) and it involves the barrel being hot forged around a mandral that has reverse rifling on it. the mandral is removed from the inside of the barrel and it leaves the rifling 'imprint' in the bore. Conventional rifling and canted or ratchet rifling, I think, could be best described as engineering principals. Check the link as my explanation is, no doubt, clear as mud!
Last edited by shortgrass; 04-02-2010 at 06:25 PM.