jrbet83 Posted May 9, 2013 Share Posted May 9, 2013 Thinking about going from 1.175 to 1.200 on my OAL, curious what's a typical velocity lose will be. I know there's no magic number, but trying to get a ballpark figure. Currently making 173pf with VV N320 and Bayou 180gr. Link to comment Share on other sites More sharing options...
ParaGunner Posted May 9, 2013 Share Posted May 9, 2013 (edited) Your increasing space and decreasing pressure in the case by making them longer. You will have to up the powder charge just a little to make the same velocity. You might lose 1-2 Pf with that change. Edited May 9, 2013 by ParaGunner Link to comment Share on other sites More sharing options...
jrbet83 Posted May 10, 2013 Author Share Posted May 10, 2013 I'm guessing my no other responses, the 1-2 PF must be the consensus. Link to comment Share on other sites More sharing options...
Croomrider Posted May 10, 2013 Share Posted May 10, 2013 I'm guessing my no other responses, the 1-2 PF must be the consensus. Sounds about right to me. Use it as a guideline and see exactly what it does in your application! Mike Link to comment Share on other sites More sharing options...
blaster113 Posted May 11, 2013 Share Posted May 11, 2013 A of loss of 1-2 pf points sounds about right with a longer oal. as a starting point I'd go up .1 grains and then chrono. Velocity doesn't seem to go up in a linear fashion. Link to comment Share on other sites More sharing options...
flamatrix99 Posted May 13, 2013 Share Posted May 13, 2013 (edited) Anyone have trouble with OAL varying on a 550b? I am trying to seat to 1.185" and I see it vary from 1.180 to 1.190. I keep trying to get it perfect. Edited May 13, 2013 by flamatrix99 Link to comment Share on other sites More sharing options...
WidowsSon683 Posted May 13, 2013 Share Posted May 13, 2013 (edited) So you will get a drop in velocity and pressure with a longer oal and the same charge? Also whats an acceptable variance in oal? Im shooting for 1.125 but all my test rounds have been 1.123-1.130. Edited May 13, 2013 by WidowsSon683 Link to comment Share on other sites More sharing options...
gearguywb Posted May 13, 2013 Share Posted May 13, 2013 Some of the changes in OAL can at times be attributed to bullet configuration. The portion of the bullet contacting the seating die can vary slightly. To the OP, the decrease in velocity from the changes you are mentioning will not be significant. As always, your chrono is your friend. Link to comment Share on other sites More sharing options...
jrbet83 Posted May 14, 2013 Author Share Posted May 14, 2013 Anyone have trouble with OAL varying on a 550b? I am trying to seat to 1.185" and I see it vary from 1.180 to 1.190. I keep trying to get it perfect. Make sure ever station is full when your measuring/setting up your OAL. If your setting up your OAL while just using the seating station, then once you start cranking out the rounds and using all the stations (most importantly the sizing station), the OAL will change. Your OAL should stay with a +/- .001. Unless your seating die is seating the bullet off the O-GIve and not the tip of the bullet. In that case, I'd have no idea, but deviations would go up, since handgun bullets just aren't made that precise. Link to comment Share on other sites More sharing options...
flamatrix99 Posted May 14, 2013 Share Posted May 14, 2013 (edited) Anyone have trouble with OAL varying on a 550b? I am trying to seat to 1.185" and I see it vary from 1.180 to 1.190. I keep trying to get it perfect. Make sure ever station is full when your measuring/setting up your OAL. If your setting up your OAL while just using the seating station, then once you start cranking out the rounds and using all the stations (most importantly the sizing station), the OAL will change. Your OAL should stay with a +/- .001. Unless your seating die is seating the bullet off the O-GIve and not the tip of the bullet. In that case, I'd have no idea, but deviations would go up, since handgun bullets just aren't made that precise. I will try this... Thanks. I am loading SWCs and had to swap the seating die around from RN. Edited May 14, 2013 by flamatrix99 Link to comment Share on other sites More sharing options...
jmbaccolyte Posted May 14, 2013 Share Posted May 14, 2013 This is a possibility too... its called a Toolhead Clamp Kit. http://www.uniquetek.com/site/696296/product/T1230 Link to comment Share on other sites More sharing options...
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