I purchased a Ruger M77 Hawkeye African (pre-muzzle break) with the express purpose of turning into something akin to the Ruger M77 Hawkeye Alaskan to hunt moose, brown bear (hopefully), coastal black bear, etc.......a true wet weather, coastal gun. The rifle has a 23 inch barrel, and is chambered in 375 Ruger. I have posted about the rifle before on here including pics. I've modified the rifle from the original replacing the LC6 trigger with a Timney, upgrading the firing pin spring to a stronger one, changing the fiber optic sight pin to a fluorescent green (which I can see better over the factory red) , Cerakoting the rifle and bolt, and having it stocked in a nice laminate (weather resistance and weight) stock to the correct LOP by Wes at Accurate Innovations... It was a very fun project to play with, and I learned a lot about the rifle while installing the fiber optic sight bead, trigger, and firing pin spring. The coating and stock turned out great as well. I topped the rifle with a Trijicon Accupoint 1-4x24 scope with the German #4 reticle and amber dot fitted in a nice pair of Talley detachable scope rings. The rifle then got put up in the safe for a couple of years unfortunately with the plan to work up hand-loads one day utilizing the 300 grain, Barnes TSX 0.375 bullets. I finally decided to start that process in earnest a few days ago, as I am thinking of taking it with me to the NWT to hunt the big moose there this September. I'm still mulling that over however, and may inevitably take my 338 Win Mag for a little more range..... In searching my reloading manuals, looking over trusted internet sources, and e-mailing with a couple of guys who have loaded for the 375 Ruger, one powder that started to become a common theme in the research, if you will, was Alliant Reloder 17. I have never loaded rounds with it before, but it is a temperature stable stick powder that meters pretty well, and is designed for those short, fat cases, that defines the short magnum genre. It is CLOSE to the same burn rate as IMR 4350 and H4350, but not the same. One guy from AK, on another forum had great success with it, and Barnes TSX 300 grain bullets, so having all the data in hand, I decided to see what the fuss was all about. Needless to say, I am very please with the results. I have been using the Optimal Charge Weight (OCW) method touted by Dan Newberry now for 3 years or so, after getting frustrated with the Audette (Ladder) Method. I think it gives you a good, stable load over a fairly broad range of powder charge variance, and in less shots than I was using with the ladder method looking for nodes. For hunting purposes, I feel it is a good method for determining a very consistent load. Anyway, I feel like I've found a great load for the 375 Ruger using this method, and as there are a lot of 375 Ruger shooters on this forum, I thought I'd share the info in case someone was looking for loading data. There really isn't a lot of data out there utilizing Alliant Reloder 17 in the 375 Ruger. Of course I temper this with the statement that what worked in my rifle, may be unsafe in yours. I went very slowly, starting with very mild loads, and working up, being very diligent in checking for any signs of pressure. One anecdotal piece of advice. Those with a lot more experience using RL 17 have said that this powder builds it's pressure slowly and consistently, especially with heavier bullets, and if not careful someone could have a very bad day in going from one powder charge to the next. In full disclosure, I have not measured pressure with a strain gauge, etc., and while I sometimes use QuickLoad to predict pressure, I've found that I'm not savvy enough yet with it to fully trust it. RIFLE/CARTRIDGE SPECS: Rifle: Ruger M77 Hawkeye African (customized) Barrel: factory Ruger barrel @ 23 inches Twist: 1:12 (according to factory specs) Brass: Hornady (fully prepped, trimmed, and F/L resized) Primer: Federal 215 (Lg Rifle Magnum) Bullet: 0.375 Barnes TSX (300 grain) Powder: Alliant Reloder 17 CONDITONS @ TESTING (OVER 2 Days) Altitude: appx 725 ft ASL Temp: avg. 90 deg F Humidity: avg 60% LOAD DATA/RESULTS: Powder: Alliant Reloder 17 Brass Trim Length: 2.570 inches COAL: 3.398 inches (for my rifle) Optimal Charge Weight: 81.0 grains Starting Seating Depth: 0.050 inches off lands (as measured with a Sinclair Intl Bullet Seating Depth Tool and bullet comparator) Avg. Velocity: 2694 fps S.D.: 6.88 Extreme Spread: 15 Muzzle Energy: 4835 ft. lbs. This load exhibited absolutely no signs of pressure, even in a 23" barrel and with an ambient temp of appx 90 deg F. As I said, be careful if you try this, as it is over book max (although it is in line with H4350 data which is a little faster). As an aside, i went all the way to 82.0 grains with and average velocity of 2725 fps with absolutely no pressure signs, but I felt like the velocity gains were starting to drop off, and I got the feeling I was getting very close to the limit. I didn't want to play with fire.... This load is already sub-MOA, but I think I can improve a little with tweaking the seating depth a little, so I'm gonna play with that before I finalize everything. Needless to say, I am very pleased, and I have to say that someone looking for a good powder to try in the 375 Ruger, ought to consider Alliant Reloder 17.