I've been using Silhoutte for about 2 years now. I like it and I feel it doesn't get a fair shake from some. It serves my purpose and it always seems to be available. Always. Can't say that about some of the more popular powders.
So, I present to you the load data that I acquired today while at the range. I suspect a few of you will have the need to opine about the loads being a little hot. Please refrain from doing so as I am well aware of all
that I am doing and feel comfortable doing so. Bear in mind that Ramshot's loading guide lists 8.4 grains as their max load for 180 gr. bullets. Surprisingly, my average velocity is damn near identical to what Ramshot lists for 8.4 gr. The resulting pressure for said load is 34,400 psi. Kinda sucks because the "10" is rated to 37,500 psi but can withstand up to 42,900 psi. I say that cautiously and prefer not to argue the point. The brass is slightly bulged with the loads at 9.0 gr. and larger and I will be able to resize fairly easily. No worries here. Been there, done that.
Today's testing was accomplished using my G20 with a Lone Wolf Barrel (stock length) along with a 22# recoil spring riding on a stainless steel guide rod. Cases are Starline shooting 180 gr. Hornady XTP JHP. The chrono is a model F1 Shooting Chrony. Distance from chrono was 6 feet. Ambient temperature was 45 deg. with overcast skies. C.O.L. were set at 1.258" - 1.259" WLP primers are employed to light the fire.
As a disclaimer I must inform you that these loads are what I use (and have used) and in no way do I take responsibility if you blow your s**t up! Proceed with caution.
So here we go. Let the chips fall where they may.
Avg. 1209.66 (Silhoutte specs out at 1210)
S.D . 8.37
(This is my do-it-all load I use for hunting, plinking, etc. Developed this by trial and error and without the benefit of a chrono.)
(It appears that this load is damn near identical to 8.8 grains. I will need to retest this spring to verify these two loads.)
(This load looks promising)
Not gaining much here over 9.8 grains.
Double Tap 180 Gr. JHP 1350 FPS
1301 --- Nice try, but not even close to 1350
Avg. 1277.16 - Not Bad
S.D. 18.88 - The worst of all strings fired.
E.S. 47 - Same here.
In all fairness the D.T. rounds performed as expected coming from a mass producer of ammunition. No surprises there. Hence one reason, of many, that we like to load our own.
I plan to re-run these tests if the weather conditions will be close to what they were today. But that probably wont come to fruition until spring. Deer season is upon us (next weekend).