PDA

View Full Version : 9mm Titegroup 124gr chrono results


blockfort
07-09-2012, 10:52 AM
July 8, 2012, 1800 Americana Club, 94 degF
9mm, Titegroup, 124gr copper plated flat point
Springfield XD9 5"

gr / OAL / fps 1 / fps 2 / fps 3 / avg / data / avg pf

3.4 1.000 1009 1000 1015 1008 0955 125
3.6 1.000 1051 1051 1066 1056 1002 131
3.7 1.000 1076 1059 1049 1061 1026 132
3.8 1.000 1093 1089 1057 1080 1049 134
4.0 1.000 1127 1116 1100 1114 1096 138

3.4 1.055 0992 0990 0973 0985 0955 122
3.6 1.055 1015 1046 1043 1035 1002 128
3.7 1.055 1063 1060 1091 1071 1026 133
3.8 1.055 1106 1080 1086 1091 1049 135
4.0 1.055 1150 1141 1129 1140 1096 141

LAX 1.133 1117 1133 1155 1135 nana 131

NOTES:

3 shots per load
"data" is the estimated fps from hodgdon.
LAX are lax 115gr reloads
1.000 OAL is just right for the cone/ogive of the bullet to line up with the edge of the case.
1.055 OAL is just touching the lands of my barrel.

OBSERVATIONS:

Change in speed per 0.1 grain of powder according to Hodgdon data is about 23fps
Change in speed per 0.1 gr according to testing is about 22fps
Deviation in the three runs from average is only 11fps (equivalent to 0.05gr), so statistically insignificant.
3.4 and 3.6 are slightly faster at 1.000 OAL than 1.055 OAL.
3.7, 3.8 and 4.0 are slightly slower at 1.000 OAL than 1.055 OAL
change in speed depending on seating depth is +/- 23 fps, equivalent to 0.1gr.
deviation in speed from hodgdon estimates are equivalent to 0.1-0.2 grains.

Scottie15
07-09-2012, 3:44 PM
1.000 OAL with the flat points? How much shorter are those bullets compared to a RN?

I load 3.6 gr of TG under 124 gr CMJs to 1.112-1.114". They shoot right at 130 PF if its around 60 or 70 degrees, a few points higher in the 90+ degreet temps.

blockfort
07-09-2012, 4:55 PM
115 round points are 0.555 long.

My 124 FP are 0.511

I'm not sure about your 124 RP's. How long are they?

At 1.000 OAL, my 124FP are seated 0.261 into the brass
At 1.055 OAL, my 124FP are seated 0.206 into the brass

dwtt
07-10-2012, 8:50 AM
1.000 OAL with the flat points? How much shorter are those bullets compared to a RN?

I load 3.6 gr of TG under 124 gr CMJs to 1.112-1.114". They shoot right at 130 PF if its around 60 or 70 degrees, a few points higher in the 90+ degreet temps.

I was thinking the same thing, 1.000 seems a bit too low. I reload 124 gr FMJ RN and load to 1.125" OAL. Well, if the ammo feeds reliably in the OP's gun, then there's nothing wrong.

blockfort
07-10-2012, 10:41 AM
How long are your bullets? Not everything all assembled, just the FMJ RN itself?