matt hoffman Posted May 23, 2013 Share Posted May 23, 2013 Im here at bianchi and just found out my factory federal 158 .38 special didnt make pf. Published data and my chrono it made it. Im shooting a S&W vcomp, will removing the comp help or hurt my velocity? They use a 6" for their chrono. Probably a lost cause at this point. Link to comment Share on other sites More sharing options...
DWFAN Posted May 23, 2013 Share Posted May 23, 2013 How long is your barrel? What did the ammo make through your gun/chrono? Sent from my ADR6425LVW using Tapatalk 2 Link to comment Share on other sites More sharing options...
matt hoffman Posted May 23, 2013 Author Share Posted May 23, 2013 5" with factory comp. We got 960-975 at 75-85 degrees. New at reloading and didint want to chance it so got the factory ammo. Link to comment Share on other sites More sharing options...
matt hoffman Posted May 23, 2013 Author Share Posted May 23, 2013 760-775 found my sheet Link to comment Share on other sites More sharing options...
gunnut315 Posted May 23, 2013 Share Posted May 23, 2013 I would think their 6 inch would make a little more speed than your 5 inch. The data I could find showed 775 which would be good if through a 6 inch but very close at 760. Link to comment Share on other sites More sharing options...
DWFAN Posted May 23, 2013 Share Posted May 23, 2013 (edited) 760-775 found my sheet Pm sent Edited May 23, 2013 by DWFAN Link to comment Share on other sites More sharing options...
pjb45 Posted May 23, 2013 Share Posted May 23, 2013 take the comp off, and put some oil down your barrel if you can chrono again. a clean slick barrel will help Link to comment Share on other sites More sharing options...
matt hoffman Posted May 24, 2013 Author Share Posted May 24, 2013 Thanks. It passed this morning 763. Their test gun is wore out old 4" l frame. It was supposed to be a 6". Link to comment Share on other sites More sharing options...
DWFAN Posted May 24, 2013 Share Posted May 24, 2013 Sent from my ADR6425LVW using Tapatalk 2 Link to comment Share on other sites More sharing options...
Greg in VA Posted May 25, 2013 Share Posted May 25, 2013 I'm here too and I had to go shoot mine also, they told me the speed was 906 fps with their gun, I'm shooting 125 gr bullets so I shoot it in my gun with an 8" barrel and they go 1069 fps..... no problem, but I did not know they were using a 4 inch gun! Link to comment Share on other sites More sharing options...
gm iprod Posted May 28, 2013 Share Posted May 28, 2013 You mean they cocked the chrono again. What a surprise. I think it is time that they have a manual fired at them about the correct procedure for using a chronograph at a fairly important match. Link to comment Share on other sites More sharing options...
9146gt Posted May 28, 2013 Share Posted May 28, 2013 Why chrono... projectile must pass thru target and backer and knock down steel. Tom Link to comment Share on other sites More sharing options...
gm iprod Posted May 30, 2013 Share Posted May 30, 2013 I can make ammunition that can do that and have no more power and recoil than 22lr. Not the way the game works, we do not want to head down the Olympic Bullseye rules route. 120pf is the way this game goes. We have to make that and they have to have a proper way to verify that the shooter is following the rules. Too many inconsistencies in the way they use the chronograph. It is solvable and easily done at that. Link to comment Share on other sites More sharing options...
Spangler Posted May 31, 2013 Share Posted May 31, 2013 They get me every year:( They don't even have a 9x23 barrel so we have to use our own guns. I guess at least I know it will pass! All things considered...still another great match Link to comment Share on other sites More sharing options...
Griz Posted May 31, 2013 Share Posted May 31, 2013 I don't see what you guys are complaining about, I'm sure they have an audit trail that shows the chrono is kept calibrated and they have a rigorous testing procedure documented so there are no variations shooter to shooter... After all, nobody would run a national championship without a calibrated chronograph, right? <- (that's my poker face) Link to comment Share on other sites More sharing options...
Spangler Posted May 31, 2013 Share Posted May 31, 2013 LOL... as long as we all pass we don't care if it's calibrated or not <my na na na na nana face... Link to comment Share on other sites More sharing options...
9146gt Posted June 1, 2013 Share Posted June 1, 2013 (edited) I don't see what you guys are complaining about, I'm sure they have an audit trail that shows the chrono is kept calibrated and they have a rigorous testing procedure documented so there are no variations shooter to shooter... After all, nobody would run a national championship without a calibrated chronograph, right? <- (that's my poker face) Ask CED how they calibrate their chronos? Tom Edited June 1, 2013 by 9146gt Link to comment Share on other sites More sharing options...
Griz Posted June 1, 2013 Share Posted June 1, 2013 Calibration is not a one time deal for measurement equipment. It has to be done periodically as components age. A chronograph used in uncontrolled lighting is even worse than most equipment, it should be calibrated every time it is set up and again when conditions change if you really need accurate results. I guess it's voodoo to most people. The magic box says X fps, so that must be right! Link to comment Share on other sites More sharing options...
gm iprod Posted June 2, 2013 Share Posted June 2, 2013 I check my chronograph and keep records of the velocity produced on that date. I use either CCI 22lr Standard, Winchester T22 or Federal 711B Match. All produce between 1070fps and 1090fps from my BSA Martini Match rifle or my BRNO Model 2E rifle at 10ft from the muzzle. Link to comment Share on other sites More sharing options...
Action Pistolero Posted June 2, 2013 Share Posted June 2, 2013 They get me every year:( They don't even have a 9x23 barrel so we have to use our own guns. I guess at least I know it will pass! All things considered...still another great match Travis and I didn't have to go. Link to comment Share on other sites More sharing options...
gm iprod Posted June 2, 2013 Share Posted June 2, 2013 They just did not want to argue with me again I think??? Link to comment Share on other sites More sharing options...
kimmbeckwith Posted June 2, 2013 Share Posted June 2, 2013 Ididn't have to visit them. :-) Link to comment Share on other sites More sharing options...
9146gt Posted June 3, 2013 Share Posted June 3, 2013 I check my chronograph and keep records of the velocity produced on that date. I use either CCI 22lr Standard, Winchester T22 or Federal 711B Match. All produce between 1070fps and 1090fps from my BSA Martini Match rifle or my BRNO Model 2E rifle at 10ft from the muzzle. How is a chrono calibrated clock speed? CED said they do it with a air pistol. Tom Link to comment Share on other sites More sharing options...
gm iprod Posted June 3, 2013 Share Posted June 3, 2013 I don't really think it matters how you do it as long as what you are doing is as consistent as you can be. I use the above mentioned ammo as I can get it regularly and it always is made within certain specifications. If you use an air pistol of course you are also checking how well the sensors work with a small slow moving pellet that will show up errors very quickly. Plus pre-compressed air guns have the most reliable ES. As long as the charge cylinder is at 90% or more of it's capacity they firing chamber is filled perfectly every time. Link to comment Share on other sites More sharing options...
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