Some Longshot and Titegroup Chrono results.

[Dieselman]

  I have been looking for a reduced pressure 10mm load to use in my 10mm brass that has been reloaded more times than I am comfortable for hot loads.  So I loaded up a few test rounds and fired them across the Chrono yesterday.

Test Gun is a Kimber TLE II 10mm, 5" barrel.  Chrono is Chrony F-1 at ten feet from muzzle.  Temp was 68 degrees Fahrenheit at 1000' elevation

Load 1:

Pulled Federal 180 gr. HST
Longshot @ 8.5 grains
CCI # 300 primers
C.O.L.  1.255"
Chrono average - 1202 feet per second


Load 2:

Pulled Federal 180 gr. HST
Longshot @ 8.8 grains
Win WLP primers
C.O.L. 1.255"
Chrono average - 1220 feet per second


Load 3:

Pulled Federal 180 gr. HST
Titegroup @ 5.7 grains
CCI # 300 primers
C.O.L. 1.255"
Chrono average - 1052 feet per second

The Titegroup was the most accurate of the three tested.  However, the Titegroup load showed flatter primers than the faster velocity slower burning Longshot loads.  Further going to prove that Titegroup's fast burn rate causes quick pressure spikes that stress brass as much as a slower burning load would loaded to high velocity.




Now just for fun, here is my chrono results again from last year of higher Longshot charge weights for comparison. These loads were fired on March 28, 2015 through the same gun across the same chrono.



Pulled Federal 180gr HST
Longshot @ 9 grains
Win WLP primer
C.O.L. 1.255"
Chrono average - 1299 feet per second


Pulled Federal 180gr HST
Longshot @ 9.2 grains
Win WLP primer
C.O.L. 1.255"
Chrono average -  1342 feet per second


Pulled Federal 180gr HST
Longshot @ 9.4 grains
Win WLP primer
C.O.L. 1.255"
Chrono average - 1356 feet per second. - Pressure signs, Flattened primers with heavy firing pin sweep. Not much velocity gain from 9.2 grains.  Consider 9.2 grains to be max load in my gun

[Benchrst]

Thanks for sharing!

I've only loaded 155s & lighter with Titegroup, but am going to workup some 180 target stuff.

Kinda silly thinking, but not every 10mm load needs to require a comp & 24# RSA