glockdude1 Posted March 27, 2014 Share Posted March 27, 2014 I just bought a new CED ProChrono....yesterday I tried it for the first time... I started with factory ammo to test the accuracy of the unit...it was spot-on accurate Then I started running my reloads through and the readings were fluctuating by 10 PF....I tried different loads on both 180gr and 200gr CMJ FP's and it still fluctuated a lot.. I load with a Dillon 550B....is there a reason my reloads are that far apart?? HELP!! Link to comment Share on other sites More sharing options...
techj Posted March 27, 2014 Share Posted March 27, 2014 How many rounds did you measure? What was the average and the standard deviation? FWIW - I usually run 10 rounds at a minimum and that is after at least a couple of rounds have been shot through the barrel. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 27, 2014 Share Posted March 27, 2014 Isn't 10 PF about 50 fps? That's not a terrible deviation, is it? Link to comment Share on other sites More sharing options...
Ssanders224 Posted March 27, 2014 Share Posted March 27, 2014 ....is there a reason my reloads are that far apart?? HELP!! Yes. But it most likely has nothing to do with your chrono. Link to comment Share on other sites More sharing options...
Steve RA Posted March 27, 2014 Share Posted March 27, 2014 Do you mean by "10 Power Factors" or by Feet Per Second ??? Link to comment Share on other sites More sharing options...
glockdude1 Posted March 28, 2014 Author Share Posted March 28, 2014 I shot 15 rounds with each load... I do mean 10 Power Factors, not 10 feet/second Link to comment Share on other sites More sharing options...
glockdude1 Posted March 28, 2014 Author Share Posted March 28, 2014 I would think that 50 fps is a lot of deviation..isn't it?...I am new to chronographs, so maybe it isn't bad.....after I shot a few rounds of factory ammo, it was within 1 fps, and I know that reloading won't get me that close, but a variation of 50 fps I would not think it is acceptable...maybe it is....you experienced guys can tell me, please Thank you Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 28, 2014 Share Posted March 28, 2014 Glockdude, Do you mean you got 825 - 875 fps, or did you get 800 - 900 fps? My experience is that 825 - 875 fps is not fantastic, but not abnormal, either. Link to comment Share on other sites More sharing options...
glockdude1 Posted March 28, 2014 Author Share Posted March 28, 2014 It was like 825-875 fps deviation Link to comment Share on other sites More sharing options...
RDA Posted March 28, 2014 Share Posted March 28, 2014 It was like 825-875 fps deviation I don't think you mean there was a 825-875 fps deviation, I think what you mean is you saw a range of 825-875 fps (a difference of 50 fps from min to max) with your reloads. That isn't abnormal. You didn't provide all your specifics (load, gun, etc.) but you can probably tighten that up with more consistent powder charges and improving your reloading skills. But, your subject is probably off base and gives a reader the impression that your chrono was erratic when more than likely it was your loads that were "erratic" (in your words). Link to comment Share on other sites More sharing options...
ZackJones Posted March 28, 2014 Share Posted March 28, 2014 It was like 825-875 fps deviation So are you saying that for one round the chrono may have read 800 FPS and for the next one it read 1625? If so something is seriously hosed up. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 28, 2014 Share Posted March 28, 2014 It was like 825-875 fps deviation Glock, if all your rounds were in the 825 - 875 fps range, there is nothing wrong with your loads or the chrono. That's normal distribution - at least in my experience. We all hope the range will be smaller, but usually isn't. How's the accuracy? Link to comment Share on other sites More sharing options...
glockdude1 Posted March 28, 2014 Author Share Posted March 28, 2014 I am running an STI Edge with a 6" barrel, Fusion barrel.. My load was.. 5.0 grains of HP-38 200gr Precision Delta FMJ FP OAL is 1.198....my gun likes longer OAL's My FPS were.. Low of 907 and High of 960 and a 10-round average is 924.6 FPS This might be a normal deviation...I don't know for sure.. I am a newbie to a chrono, but I am not new to reloading...2 years under my belt there.. Link to comment Share on other sites More sharing options...
glockdude1 Posted March 28, 2014 Author Share Posted March 28, 2014 Sorry guys...typo error on the last post.... I was using a 180gr FMJ FP bullet Power Factor average was 166.4 Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 28, 2014 Share Posted March 28, 2014 How's the accuracy? Link to comment Share on other sites More sharing options...
Ray_Z Posted March 28, 2014 Share Posted March 28, 2014 Are you using the same brand of brass for your test? I will get that deviation from mixed head stamps. When I tested my 9mm load with Winchester brass my extreme deviation will be 7. Using mixed brass I can double or triple that. Link to comment Share on other sites More sharing options...
Sarge Posted March 29, 2014 Share Posted March 29, 2014 Yep. Same head stamp and use lube. Those two steps will tighten things up considerably. Then you can get down to the nitty gritty by pulling the first few rounds off the press and putting them in the practice bucket. Same with the last few as well. Keep the press moving fluidly during a run. Don't stop and start except to reload primers. Link to comment Share on other sites More sharing options...
glockdude1 Posted March 29, 2014 Author Share Posted March 29, 2014 I use mixed brass....I bet that is my problem... Accuracy is pretty good Good advice on putting the first few and last few rounds loaded into the practice bucket Thanks guys...you are a great help!! Link to comment Share on other sites More sharing options...
glockdude1 Posted March 30, 2014 Author Share Posted March 30, 2014 I separated my brass this morning on my 40 S&W brass...I have a question.. On the Winchester brass, I have both the name "Winchester" stamped on some of the brass and I have an equal amount of brass stamped "WIN" Should I further separate these, or is it OK to mix them together, because they are both Winchester brand? Link to comment Share on other sites More sharing options...
Sarge Posted March 30, 2014 Share Posted March 30, 2014 (edited) I separated my brass this morning on my 40 S&W brass...I have a question.. On the Winchester brass, I have both the name "Winchester" stamped on some of the brass and I have an equal amount of brass stamped "WIN" Should I further separate these, or is it OK to mix them together, because they are both Winchester brand? Those two are most likely interchangeable. Look out for WCC and WIN NT. WCC is Winchester military with crimped primer pockets. NT is not toxic and in my experience the primers don't seat as well unless I ream the pockets. You can ream pockets on WCC as well but from what I understand the inner dimensions are different so the pressures will be different. Not to unsafe levels but certainly enough to throw off your chrono testing. Edited March 30, 2014 by Sarge Link to comment Share on other sites More sharing options...
glockdude1 Posted March 30, 2014 Author Share Posted March 30, 2014 I hear you about the NT brass....learned that from loading 9mm with FC and FC NT...NT's would not allow a primer in the pocket at all ! Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 30, 2014 Share Posted March 30, 2014 I use mixed brass....I bet that is my problem... Accuracy is pretty good Glock, if your accuracy is "pretty good", you don't have a problem ... Link to comment Share on other sites More sharing options...
mjohn Posted April 1, 2014 Share Posted April 1, 2014 (edited) I hear you about the NT brass....learned that from loading 9mm with FC and FC NT...NT's would not allow a primer in the pocket at all ! Hmmmmmmmmmmmmm............I just finished loading a batch using only FC and FC NT range pick up brass. No problems and all brass had no problems seating primers on my 650. All was well. PS.........they all go bang too as and added bonus. Edited April 1, 2014 by mjohn Link to comment Share on other sites More sharing options...
Sarge Posted April 1, 2014 Share Posted April 1, 2014 I hear you about the NT brass....learned that from loading 9mm with FC and FC NT...NT's would not allow a primer in the pocket at all !Hmmmmmmmmmmmmm............I just finished loading a batch using only FC and FC NT range pick up brass. No problems and all brass had no problems seating primers on my 650. All was well.PS.........they all go bang too as and added bonus. You might have picked up brass that has already been swaged. Link to comment Share on other sites More sharing options...
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