close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Improved Stability Formula for Plastic Tipped Bullets

LinkBack Thread Tools Display Modes
  #15  
Unread 12-29-2012, 06:52 PM
Silver Member
 
Join Date: Nov 2010
Location: Southern United States
Posts: 284
Re: Improved Stability Formula for Plastic Tipped Bullets

Quote:
Originally Posted by RBBeers View Post
Should the second quote read "The effect of a plastic tip or an empty space in the tip of a bullet is to increase stability relative to a constant density bullet of the same dimensions."?
Right. Good catch. I've edited the original to correct the mistake. Thanks.
Reply With Quote

  #16  
Unread 12-23-2015, 09:18 AM
Silver Member
 
Join Date: Oct 2012
Location: Windsor, VA (but heading for the Rockies)
Posts: 417
Re: Improved Stability Formula for Plastic Tipped Bullets

Late... but tagging in. This is some really good stuff!

DocB
__________________
http://www.heaven-scent-rescue.org

"History does not long trust the care of freedom to the weak or timid" Dwight David Eisenhower
Sic Semper Tyrannis...Veritas et Aequitas

Reply With Quote
  #17  
Unread 12-23-2015, 09:52 AM
Platinum Member
 
Join Date: Jul 2007
Location: Mt., Id. , SD
Posts: 1,002
Re: Improved Stability Formula for Plastic Tipped Bullets

Quote:
Originally Posted by DocB View Post
Late... but tagging in. This is some really good stuff!

DocB
E
I'm right with you Doc. Never have shot plastic tip bullets before but I can see that is about to change.

Been hesitant to try the new ELD-X bullets just because the info coming out says I need a 1-9" twist barrel for their lighter .284 pill but this shows they should stabilize with my 1-10" twist.

I wonder if Hornady is just being a little extra conservative with their twist recommendations.

Carry on - I'm late but paying attention and appreciate this older thread being brought back up.
Reply With Quote
  #18  
Unread 12-23-2015, 10:28 AM
Silver Member
 
Join Date: May 2012
Posts: 256
Re: Improved Stability Formula for Plastic Tipped Bullets

Missed this before, enjoy ths kind if stuff. Thanks for reposting it, and investigating the tip effect on stability.

Good times to be a long range shooter!
Reply With Quote
  #19  
Unread 12-23-2015, 10:45 AM
Platinum Member
 
Join Date: Apr 2005
Location: Alaska
Posts: 4,468
Re: Improved Stability Formula for Plastic Tipped Bullets

Bryan Litz once posted on this Forum that he wasn't confident in the science behind the stability formulas that account for bullets tipped with less dense materials. His post was in response to my post referencing a stability formula provided in Patagonia Ballistic's ColdBore 1.0 ballistic software that accounted for plastic tipped bullets. But I got the sense he didn't feel comfortable with the science supporting the formula in a broader sense. For what it's worth. . . .

I do believe that less weight in the tip of bullets does reduce the barrel twist rate required for bullet stability, compared to bullets with lead all the way out to the bullet tip. Bryan may also. Bryan didn't go into a detailed explanation on his concerns, and I didn't pursue it. Mostly because I got the sense he wasn't interested in diving into a detailed post.
Reply With Quote
  #20  
Unread 12-23-2015, 11:07 AM
Silver Member
 
Join Date: May 2012
Posts: 256
Re: Improved Stability Formula for Plastic Tipped Bullets

Phorwath one takeaway that I think most current shooters, and scientific study, would agree with is that our tradition sense of what "normal" twist should be ought to be tweaked a kittle in favor of tighter twist. Now that all the major bullet manufacturers are producing bullets with incredible BC, factory twists probably should adjust down, and it seems there is little downside to having a little tighter twist when ordering custom barrels unless you have velocities in excess of 3400 or so, after all we arent talking 100 yard benchrest.
Reply With Quote
  #21  
Unread 12-23-2015, 11:36 AM
Platinum Member
 
Join Date: Dec 2008
Location: Grantsville Utah
Posts: 4,600
Re: Improved Stability Formula for Plastic Tipped Bullets

Quote:
Originally Posted by KYpatriot View Post
Phorwath one takeaway that I think most current shooters, and scientific study, would agree with is that our tradition sense of what "normal" twist should be ought to be tweaked a kittle in favor of tighter twist. Now that all the major bullet manufacturers are producing bullets with incredible BC, factory twists probably should adjust down, and it seems there is little downside to having a little tighter twist when ordering custom barrels unless you have velocities in excess of 3400 or so, after all we arent talking 100 yard benchrest.
I go back to my original comment earlier in the thread. While I do not understand everything that causes all the various changes, I do understand that when you add a heavier tip of identical shape in an otherwise identical bullet, accuracy goes south in every instance that I have done it. I am not sure if more twist would correct this or not, but it seems to upset the balance in one way or another. This may or may not be true with all shapes and sizes of bullets, but it held true in the 190-240 grain bullets that I shot in my 30 cal. with 10 twist........Rich
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Improved Stability Formula for Plastic Tipped Bullets
Thread Thread Starter Forum Replies Last Post
Aluminum tipped bullets swiftackley Rifles, Bullets, Barrels & Ballistics 5 01-23-2010 05:10 PM
Barnes Tipped TSX bullets WyoHunter Reloading 13 01-08-2009 04:12 PM
Wildcat ALuminum Tipped Bullets Earl Fouraker Rifles, Bullets, Barrels & Ballistics 14 12-03-2008 07:29 PM
.30 cal Aluminum tipped bullets for handguns Lightvarmint Specialty Handgun Hunting 5 07-30-2008 06:44 PM
.30 cal Aluminum tipped bullets for handguns Lightvarmint Specialty Handgun Hunting 0 06-25-2008 07:45 PM


All times are GMT -5. The time now is 04:03 PM.


Powered by vBulletin ©2000 - 2016, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2015 Long Range Hunting, LLC