I have had this 336D since January and have been working on finding a load that shot out of it. I started with the Speer 180 gr bullets I had a box on hand that a friend gave me. I had used H335, IMR 4064, RL-7 the group sizes were 3-10 inches at 100 yards. the only thing that was consistant was it shot like crap. So I shot up the 180 supply and never looked back. then I went to my Rem 200 gr RN supply. The results were not much better with H335, IMR 4064, RL-7, H4198, the group sizes ran 2-8 inches. Then I tried the AA powders. The AA2520 and AA2015BR have shot great. Sifting over the data tonight I think I will go with the AA2015BR. Every single time I ran the loads of it the magic spot was 35.0 grains, under 1/2 inch and nearly one hole. Five times and the same results. there are some other loads of both the 2015 and 2520 that shot well, but this was the best. As far as the velocity it will not be the top, but by far the most accurate. This rifle was a frustrating game, but I knew it had to shoot. My friend told me back in March I should send it back to Marlin, but I wouldnt listen. Sometimes it pays to be persistant. Wish I would have tried the 2015BR first :roll: Now it is going to be a tough choice for deer season.