Markhpb Posted May 29, 2012 Share Posted May 29, 2012 Hey guys, I am new here, but I have a question. How often are chronos wrong? I just got one and not sure it is reading propperly. It is a Chrony f1 model and I was shooting 10 feet from the closest screen. I was working up some 9mm major loads (1st time trying to get to major). It seems like I got there before most do with the same powders. These loads were all shot out of stock STI trubor T2 comp except 9# spring. If you see anything I am doing that reaches the danger levels, PLEASE let me know. Load 1 Mixed headstamps MG 115 cmj OAL 1.170 Win small pis mag primers Auto comp 7.4 grs Avg Vel 1540 fps Load 2 all else the same HS-6 8.4 grs Avg vel 1527 just in case it matters the HS-6 is my new powder choice w the 115's. (Seemed much softer to me) Thanx, Mark Link to comment Share on other sites More sharing options...
Sarge Posted May 30, 2012 Share Posted May 30, 2012 I don't know about 115's but I push 121's to 1425-1450 with 7.3 WAC. Sounds like your barrel is pretty fast. Link to comment Share on other sites More sharing options...
Desmo412 Posted May 30, 2012 Share Posted May 30, 2012 Just ran some zero 115 conical jhps over the chrono. 8.4gr HS6 at 1.140 with fed small rifle primers made 1488fps avg. This is with a full size schuemann barrel and brazos thundercomp with no holes. Your load seems slightly fast, but not too far off Link to comment Share on other sites More sharing options...
gng4life Posted May 30, 2012 Share Posted May 30, 2012 That does seem fast, especially for a TruBor, but not too far off. However, the Chronys have been notorious for false readings. I would probably move back to 12 or 14 feet and check again. Also, make sure the conditions are right (sunlight, shade, position, etc.) If possible, validate your readings with another chrono. What were your SD and ES readings? Link to comment Share on other sites More sharing options...
Bshooter Posted May 30, 2012 Share Posted May 30, 2012 I like HS6, it seems to be the right powder for major 9. I use 124gr MGHP with 8.4 to make major in a shorty gun. Link to comment Share on other sites More sharing options...
gng4life Posted May 30, 2012 Share Posted May 30, 2012 I like HS6, it seems to be the right powder for major 9. I use 124gr MGHP with 8.4 to make major in a shorty gun. I had the same conclusion about HS6 after testing it against several other powders and its great for 115, 121, and 124s. Of course, that's like the Chevy vs Ford thing so use what works best for you. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted May 30, 2012 Share Posted May 30, 2012 I would move back to 12 or 14 feet and check again. Also, make sure the conditions are right (sunlight, shade, position, etc.) If possible, validate your readings with another chrono. What were your SD and ES readings? +1. GNG4 hit it on the head, here. Did you have any readings far above or below the average? If not, your Chrony is probably doing a good job for you (Mine has for 20 years). Link to comment Share on other sites More sharing options...
Mat Price Posted June 1, 2012 Share Posted June 1, 2012 (edited) 9mm major (same gun as above ) radical slide lightening 3 holes 9.6 grains hs6 115 gr p delta FMJ oal 1.165 wolf SRP 5 shot 3 shot AVG 1534 1534 Hi 1562 1549 lo 1518 1513 es sd 14.7 176 PF 176 38 super comp 9.6 grains hs6 115 gr p delta FMJ oal 1.235 wolf SRP avg 1450 hi 1469 lo 1432 es 37 sd 15 pf 166 both super load and 9 major is very good! soft and flat. the super load I am moving up to 9.9 grains I moved the load to 9.9 amd get 175 flat .38 super comp 9.9 grains hs-6 115 p delta fmj 1.235 1524 1534 es 17 sd 5 pf 175 sorry I copied the wrong data. Edited June 1, 2012 by Mat Price Link to comment Share on other sites More sharing options...
Aircooled6racer Posted June 1, 2012 Share Posted June 1, 2012 Hello: I think your chrono is off. I can get 171PF with 8.9 grains of HS-6 using 115's Montana Golds, Wolf small rifle primers and a OAL of 1.170". That is on 4 different chrono's including at Area 1 this year. The barrel has 2 "Hill Hell Holes" in it. Thanks, Eric Link to comment Share on other sites More sharing options...
Mat Price Posted June 1, 2012 Share Posted June 1, 2012 (edited) but I am going to try 4756 just to see Edited June 1, 2012 by Mat Price Link to comment Share on other sites More sharing options...
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