A historical note:
The "Treasury Load" was first loaded by Winchester in the mid 1970's under the "Q Load" product line, which was for special orders. Several Federal agencies used the load, which was the 110 grain JHP bullet loaded pretty hot. The Calif. Highway Patrol also adopted the round prior to switching over to the S&W 4006 pistol. The Air Force did some high speed photography in ballistic gelatin that was pretty impressive. I viewed the film several times, and tried to get our department to adopt the round, but County Counsel wouldn't allow the Sheriff to sign the liability waiver that Winchester required before they would sell the ammunition to an agency. I had several phone conversations with the Vice President of Winchester Ammunition at the time, and he told me they were in the process of developing the Silver Tip bullet for use in handgun ammunition and that it would be even better than the +P+ Q load, and would be available without a waiver. The issue they were trying to cure was the aluminum jacket separating from the lead core, which they eventually solved. We adopted the Silver Tip line in several calibers and it served us well. Later on, Federal also loaded ammunition to the same specifications under government contract, which they won in open bidding.
The brass is the same brass used in +P loadings and is fine for reloading. I've fired many rounds of this ammunition, but never chronographed any of it. I still have about a dozen boxes of the loaded ammunition, and if I remember, I'll take some to the range the next time I'm going to do some chronograph work and see what they run out of 4" and 6" barrel .38 revolvers.
Hope this helps.
Fred
