Cushty mush Posted May 10, 2014 Report Share Posted May 10, 2014 Hello gents I'm loading my 223 with 55g Sierra sp with 23.5g I want to use strelok app and was wondering if anybody knows the ballistic coefficient of this load as I have no crono Thank cm Link to comment Share on other sites More sharing options...
MrCetrizine Posted May 10, 2014 Report Share Posted May 10, 2014 Which Sierra? Varminter, Blitzking? 23.5gn of which powder? What's your barrel length and twist rate? It varies quite a lot depending on exact bullet and velocity. Link to comment Share on other sites More sharing options...
Cushty mush Posted May 10, 2014 Author Report Share Posted May 10, 2014 Sorry I'm a total novice 1/8 twist powder is Lovex- formally known as accurate2015 20" barrel and Sierra varminter sp Link to comment Share on other sites More sharing options...
Shuggy Posted May 10, 2014 Report Share Posted May 10, 2014 They are published on Sierra's website: http://www.sierrabullets.com/documents/BallisticCoefficient-rifle.pdf Link to comment Share on other sites More sharing options...
Cushty mush Posted May 10, 2014 Author Report Share Posted May 10, 2014 Yes I've looked at that but I can't see them on there Thanks all the same Link to comment Share on other sites More sharing options...
gbal Posted May 10, 2014 Report Share Posted May 10, 2014 OK, some descriptions are are bit vague- and many fewer 'soft points' are actually made now (plastic tips replacing,in some cases-which alter/improve BC a bit) so look at the bullet identifying number on the box,and see if it's on Sierras list.Sierra are actually pretty good with their BC values,and give the two values,to show that velocity is a factor,though not huge in itself. Factory soft point 55g have rather low G! BCs...Remingtons are only .198,Norma .235 for example. Just to compare,ballistic tip 55g run around .255 Accutip Remingtons; . 267Win Silvertip or Nosler Bal tip. The differences at shortish range are not huge (Rems are 6 inch wind drift/650 ft lb energy at 200yzero,the Nosler 4/760 ; drop/drift /energy at 400 (200 zero) is -26/29/295 and-21/20/437,so it begins to make a real " need to know" difference as range increases. Hope this helps,meanwhile-you are of course quite right to want the best program predictions. Gbal Link to comment Share on other sites More sharing options...
Cushty mush Posted May 10, 2014 Author Report Share Posted May 10, 2014 Thanks gents now sorted To have a play tomorrow Link to comment Share on other sites More sharing options...
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