Case head expansion measurements for 200gr GDHP loads

475/480 · August 05 2013 06:36:00 AM MDT

Speer 200 gr GDHP. new Starline brass, Primers WLP.
GUN: Kimber Traget II, chamber support :FULL
Powder
800X
8.5gr =1070 fps .Case Dia: .426"
9.3gr =1270 fps . Case Dia: .426"
Blue Dot
11.0gr =1180 fps : Case Dia .426"
11.3gr =1225 fps : Case Dia .426"
Longshot
8.5gr =1150 fps :Case Dia .4245"
8.8gr =1185 fps :Case Dia .425"
9.1gr =1220 fps :Case Dia .4255"
AA7
12.0gr =1274 fps : Case Dia .426"
12.3gr =1308 fps : Case Dia .4265" primer extremely flat

Intercooler · August 05 2013 07:19:33 AM MDT

This is a Kimber Target? Start at .419 or .420?

475/480 · August 05 2013 07:43:51 AM MDT

Good question on starting point ${$default_huh_smiley}$ . I will get that tonight.

Sean

Quote from: Intercooler on August 05 2013 07:19:33 AM MDT
This is a Kimber Target? Start at .419 or .420?

Intercooler · August 05 2013 08:02:58 AM MDT

We always thought the Kimber was best but my Razorback was .424-.425 being the tightest so far. I think .006" is about perfect!

475/480 · August 05 2013 06:13:55 PM MDT

Starting case head measurement is .421"

Sean

Intercooler · August 05 2013 06:21:33 PM MDT

Crazy. The Shadow questioned me at .420 I think saying they should be .419 to start.

The_Shadow · August 05 2013 07:15:17 PM MDT

Most all the factory ammo I measured at 0.42150", I think SAAMI Base diameter 10.80 mm (0.425 in)

Intercooler · August 05 2013 07:23:05 PM MDT

I had the wrong direction ${$default_grin_smiley}$