9mm question

[1fast8]

i am just starting to load a freind has a chrono so last night we shot winchester white box 115g fmj speed average was 1110 then we loaded 124g rn from bullet works with 4.0 tite group it shot 990 oal was 1.14 i backed load down to 3.7 now my question is the 115g rn bullet is .060 shorter than the 125 rn question is can i load the 115g at 3.5 or 3.7 and pull the oal down to 1.10

 

[alank2]

Hi,

Make sure you use published load data and don't guess. Published load data has been pressure tested. Make sure you follow the same oal as seating shorter will increase pressures.

You can get data from here for titegroup:

http://data.hodgdon.com/main_menu.asp

ALSO, if I recall correctly, titegroup is a powder that is unforgiving when it comes to pressure. Be careful.

Good luck,

Alan

 

[Twmaster]

What Alan said.

Case volume matters. You could have an overpressure explody.

 

[tul9033]

1.13/1.14 should be fine for that load. You will need to pull a WWB bullet to compare the lengths of the load you are trying to emulate.

Case length + bullet length - OAL =Seating Depth

9mm.... MG124.... OAL
.7473 + .5925 - 1.134 =Seating Depth

1.3398 - 1.134 = .2058" seating depth

What length of barrel are you shooting it from? 990 FPS @ 4.0gr TG seems quite slow out of anything but a short barrel. I'll get around 1070+ out of a Glock 17 lead or FMJ with 4.0gr.
I was getting 1240 FPS with WWB and a Glock 17.