IMR TARGET and TITEGROUP
For decades, I've been using the same powders in my 45's.
231, BE, HP38, Clays, WST.
Recently I've acquired some IMR TARGET and TITEGROUP.
Both are relatively new technology propellants.
The load data from the Hogdon website has both of these powders STARTING at fairly full powered loads and goes up from there.
My yardstick for "full power" is the IPSC/USPSA/IDPA power factor (PF) of about 165. The idea of power factor was to simulate the felt recoil of full power defensive ammunition.
The STARTING loads as tested in my pistol exceeded 170.
No doubt, a constant diet of 170 PF ammo will damage a pistol. I know this from personal experience.
This is one of the reasons why 2700/bullseye competitors shoot soft-recoiling “target” loads.
For these competitors, the classic target load has always been 3.5 to 4.2 BULLSEYE with a 180-200 grain bullet. Typical velocity for such ammunition is 700FPS or a PF of about 140. They will shoot thousands of such rounds per year with little or no damage to their carefully customized target pistols.
So I searched the net for anyone who had posted information about reduced loads with these newer powders and only found a vague reference by an older shooter who tried a reduced TITEGROUP load, but never posted any test data. I have an inquiry in to HOGDON about this, but I have not received any response yet.
So I decided to do a quick and dirty test myself.
The basic test method was to load the recommended STARTING charge and go down by 10%.
The components:
Lee 6-cav handcast #68 style 200 gr.LSWC (not a match grade bullet)
Custom 30-70 blend Alox-beeswax bullet lube.( Sized 0.452)
FEDERAL brass
FEDERAL GMM150 primers
OAL=1.250 Taper crimp=0.468
Dillon dies
Pistol=Colt S70 GVT with 5.5” Bar-Sto bbl
Chrony at 5ft. /Target at 25 yards.
to be continued.....