mcb Posted February 27, 2008 Share Posted February 27, 2008 I am working up a minor 45ACP load to shoot my XD-40ACP in Production. I already shoot my XD-40 in Limited-10 and got the XD-45ACP Tactical in a trade so I though I would try in in production. The article in Front Sight a few month ago probably influenced that too. So I picked up some 200gr RSFP bullets from a local company (National Bullet) cheap and figure I would see what I could do with it. Since I was going for Minor I also thought I would try Trailboss as my powder. There is not a lot of data for 45ACP and Trailboss but I found enough to feel comfortable working up a load. Here are my loads I tested and some chrono data for them. Testing was done in my XD-45ACP Tactical (5inch barrel) in an indoor range, low humidity and about 55-60degrees. I have replaced the recoil system on XD-45ACP with Don's Skinny Guild Rod (allows the use of 1911 recoil springs) and a 18lbs recoil spring (IIRC the stock spring is 22lbs). Load 1) 200gr RSFP Lead (National Bullet) 4.0gr Trailboss Winchester Large Pistol Primer OAL 1.188 (that's were the cannelure put the bullet) Crimp 0.470 (Dillon crimp die) Low: 666.6fps High: 713.7fps Average: 688.9fps Power Factor: 137.8 Extreme Spread: 47.09 Std Deviation: 18.54 5rds A total of 15 rds were fired and I had, surprisingly, no jams or feeding problems but I was surprised the slide locked back. Frequently it felt like the slide never made it back to stop against the locking block. As you can see velocity was not very consistent, not sure if that was inconsistency in powder charge or just poor burning at this low pressure. These were not very accurate, point of impact was lower (~4inches) than factory ammunition and at 50ft I could only manage about a 6-7inch 5-shot group. Super soft recoil but not very accurate. I could probably drop to a 16lbs spring to ensure reliable cycling but the accuracy would not likely improve. Load 2) 200gr RSFP Lead (National Bullet) 4.5gr Trailboss Winchester Large Pistol Primer OAL 1.188 (that's were the cannelure put the bullet) Crimp 0.470 (Dillon crimp die) Low: 704.2fps High: 796.0fps Average: 739.0fps Power Factor: 147.8 Extreme Spread: 91.75 Std Deviation: 34.85 5rds This load ran better but was barely achieving a full stroke on the slide. It was sightly more consistent in velocity but not much and only a minor improvement in accuracy. Still probably 5inch 5-shot groups. Point of Impact did come up some. Load 3) 200gr RSFP Lead (National Bullet) 5.0gr Trailboss Winchester Large Pistol Primer OAL 1.188 (that's were the cannelure put the bullet) Crimp 0.470 (Dillon crimp die) Low: 774.5.2fps High: 805.0fps Average: 789.4fps Power Factor: 157.9 Extreme Spread: 30.44 Std Deviation: 12.74 5rds This load also ran pretty good. The case was very full, not a compress load but getting close. The powder is so fluffy its really hard to tell if a load is compressed or not. Even going through the powder check station the plunger would noticably pack down the powder charge. Slide did a full cycle with every round but was still a nice mild recoil. Accuracy was much improved 2inch 5-shot groups at 50ft and basically the same point of impact I am use to with factory 45ACP. This will probably be my load at least until I try some other components. Not as soft as I was hoping for with the 158 power factor but it will work. I do think at least with a 5+ inch barrel you might get to major with 200gr bullets. The maximum recommended powder charge with 200gr lead bullets is 5.5gr and if you extrapolate my data to that you get a PF of about 168. I would attempt that with caution at pressure may do screw things as you start to compress the powder charge. Any suggesting for better lead bullet would be appreciated. National Bullet's bullets were OK I had a little leading near the chamber but they are cheap ($74.55/1000 out the door) Hope that was helpful or at least mildly interesting. Later mcb Link to comment Share on other sites More sharing options...
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