Right. I never shot them thru a 9-twist.
Badlands Precision Bullets thread - From BC to terminal ballistics
- Thread starter codyadams
- Start date
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VLD Pilot
Well-Known Member
Ok was curious. I built mine for the 225/230s but not quite fast enough twist for the heavier monos apparently. I really like that 205 Badlands BD bullet
You may or may not be happy. I'd feel more comfortable "over" spinning than under spinning monos for sure.
VLD Pilot
Well-Known Member
Yep that's exactly what I'm thinking. An 8 would be better than a 9
Call Badlands, there real helpful with stuff like this.
VLD Pilot
Well-Known Member
Why didn't I think of that. Thank you.
Fill out the data at the bottom and you'll get a good idea.
Twist Rate Stability Calculator
Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.
bergerbullets.com
Monkeygoat
Well-Known Member
My 6.5 max in 7.5 twist does fine with the 135's meant for 7 twist. I too have a fresh 9 twist 300 RUM I wanted to try the 205's in, but my old 10 twist barrel is still kicking... Please do update if you try 'em in yours!
Wedgy
Well-Known Member
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- Feb 9, 2013
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Berger"s stability only applies to lead bullets, not monosFill out the data at the bottom and you'll get a good idea.
Twist Rate Stability Calculator
Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.
So why do they list their .375 caliber 379 grain and 407 grain VLD bullets?
Is the stabilization calculation not just a math formula?
VLD Pilot
Well-Known Member
Appreciate the advice but that calculator has let me down more times than I care to speak of.Fill out the data at the bottom and you'll get a good idea.
Twist Rate Stability Calculator
Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.
Where does it say that? Please share a reference. I know that is not as accurate in flat-based bullets. I asked Berger some time ago because I have seen too many unsubstantiated claims, and below is their response.
According to Phil's response, yes. Enter the required bullet parameters, and you're GTG.
I have seen posts with the >2.0 SG min recommendation for monos vs. >1.5 SG min for the lead core but none from a ballistician yet. Perhaps, I just missed it.
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codyadams
Well-Known Member
Bryan Litz made a statement somewhere, I forget where I saw it though. He said that they tend to prefer to have monos at closer to the 2.0 sg rate than 1.5 with lead core bullets. I prefer not to ride the line of an unstable bullet which can lead to other terminal issues, it is pretty well known than a unstable bullet can do unpredictable things upon impact, so I just make sure I either use a bullet that is easily stable in my twist, or overtwist by about .5" if I'm building around a bullet.
I vaguely remember that too but I could not remember it. LOL, I have been going 1" faster lately.
