My new 45 cal smokeless MZL from Arrowhead Rifles finally came in and it appears to be a ringer!
First off, Specs.: 28" #17 Brux 18-twist, ASG Gen2 breech plug, 300 gr ASG XLD NSR bullets, PVA shockwave self timing brake, AG Composites Chalk Branch stock, NF NX8 2.5-20x F2 Mil-C, and TT diamond set at 1#.
The two groups shown are the first 6 shots I fired out of it this past Friday. The 70gr. H4198 load was my bore-site group at 100 yards and the first 3 shots I fired. The only hole not touching was the first round fired on the brand new barrel, all subsequent shots were cutting the previous hole. The 71gr. H4198 group was my next three shots after adjusting elev/wind. to my 100 yard zero.
Since I didn't have the Arrowhead recommended load of H322 at the time, I went with a proven smokeless load I have used before on my other smokeless MZL. This netted me 2824 fps average in 95 deg heat and 90% humidity. I figure by mzl season the temps will be on average 50 degrees cooler and my avg. velocity will be down around 2,800 fps which is fine with me. My other smokeless MZL does 2,900 fps with a 300 gr. pittman and IMR 3031. *Note: This load is my own, do not duplicate without proper work-up and consultation with your MZL builder.*
Impressions: Other than the stellar early performance and easy load work up, I really liked the load-thru funnel. You can pour the powder down through the muzzle brake as well as seat the bullet through the funnel. The one thing I was skeptical about was the no-sizing-required bullets. The NSR-ASG bullets were designed around Brux and Krieger bore dimensions. Loading and seating pressure was as good as my sized bullets that I run through a die and they obviously shot fine. I also liked the ASG magnetic bolt-stop. It is a simple solution and works.
All in all, I am very pleased with this build. Luke at Arrowhead Rifles was a pleasure to deal with and patiently answered all my questions before and during the build process. Next stop, 500 yard steel!