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Maybe not - but Mike is just one member of the board - I'd guess that he was the minority, but this issue was/is not, "a sward to die on".:eek: I thought they should have decided at last months meeting . . . but I wasn't there to comment, this spring season is pretty much a bummer everywhere. I...

I was just asked by match director, Mike Bigelow, to advise that all events scheduled for May, 2020, at Boone Valley Ikes, Webster City, Iowa have been cancelled.:(RG

Roger that - anything else is a "work around" . . . and time consuming.:p;) RG

Not that I am aware of. :( I had an uncle make some for me (he made ten sets to hold 1k each) - every time we talked about rifles, he griped about the "chip" volume until he died. When he finished them, he advised me to never ask him to do more!:p;) The last set I acquired, was from George...

Yep, the longer the jacket = more separation required.:eek:RG

Jerry, you are probably using the Miller calculator, at the bottom of the "calculators" page - that formula is simply useless for anything, except, possibly, long/heavy for caliber VLD type bullets.:p To achieve Sg 1.4, Flat base 6mm bullets of .840" long need 1:13" twist . - typical 6mm...

Tim, I am not a GURU - I just read the books, buy the barrels, make the bullets, shoot, and compare the observed results to the mathematical predictions.:eek: For new barrel purchases, I go with the math - minimum Sg 1.4 - every time.;) The GURUS always specify Sg1.5, because it provides a Sg...

Thank you, Jackie. I just ran a guesstimate (bullet geometry) the Geoffrey Kolbe twist calculator < http://www.geoffrey-kolbe.com/cgi-bin/barrel_twist.cgi > , which, regarding twist rate requirements, always correlates well with McTwist and Tioga, but has easier inputs for varying atmosphere -...

Estimated windage: Morrison Precision . . . that's a guess based upon the last Bernie Morrison BBL in my rack: it's stamped M.P. Co. If it is a Morrison, it should be very good. :)RG

DITTO that! Well reasoned and stated, Steve!:pRG

"Randy, these are cut rifled Kriegers, I assume they are dead on. The one on my HV is an old 13.5 that is probably circa 2007. I chopped the chamber off, (it was always a good barrel), and rechambered it at just over 20 inches." Jackie, though the cut barrels are very uniform, I have seen...

Steve, good reference. In the book, Modern Exterior Ballistics, by Robert McCoy, there are, shadow graph reproductions clearly showing post muzzle exit yaw/pitch - not quite as high tech, but, none the less, quite clearly happening! One attribute which BR shooters have found difficult to...

Bill, roger that - however, those bullets were made using <.800" long jackets, thus finished OAL of about 0.81". In about 1985/6, Mike Walker wrote an open letter to PRECISION SHOOTING Editor, Dave Brennan, which Dave published for all the BR world to read. Ed Spivey, and the SpiveCo, Inc...

Al, waaaAy back, beyond my ability to recall his identity, my 6 degree of freedom guru, from MIT, would never use less than 0.0001" of in-bore-yaw . . . his predictions usually ran neck-and-neck with/verified Tioga and JBM. But, as we're aware, strange stuff happens! :p:cool: RG

Presuming sea-level and Std conditions you're about as bad as it gets - well, except for temperature - THAT can be a make, or, break attribute. You may recall the "winter league" matches/ PS articles from way back in the late 80's - somewhere in the far NE, my memory just ran dry regarding...

:pYer killin' me George!;)RG

Jackie, as you suspect, the combination of a BT bullet, of this length and a 13.5" twist barrel, is, "a wreck waiting to happen": Sg 0.9 - technically, Sg less than 1.0 is unstable.:confused::eek: At sea-level, Std conditions, 3300fps, a 6mm BT of that length, for Sg 1.5, needs a 1:10.4" twist...

Best of good fortune to you, Jackie.:DRG

Empirical Sg testing, with our first PacNor 1:18" twist barrels, ordered from Chris Dichter, following my first reading of MODERN EXTERIOR BALLISTICS, by Robert McCoy, confirmed that, yes, one can set-up for [technically] stable, yet obviously wide and uniform yaw/pitch!:eek: Make some 125 -...

Can't wait to learn about THAT! :eek:;)RG