I had a fairly long run with the 264WM. The rifle was a stock Model 70 Sporter with a 26" barrel. I bedded it and then, began load work with it, Nosler cases and Retumbo. I started with the 130 AB since that was what I could get starting out. I worked up a great shooting load, in 100 degree Va temps last Summer. Those loads came out of the rifle about 3350 or so, and were very accurate. No pressure signs, shot pretty well.
Well, the next time I took that same load out, with the same exact charge, I locked up the bolt. I couldn't figure it out, till I realized, I had a completely different lot of Nosler cases, and being dumb, I loaded them up, thinking they would be the same, WRONG! They were about 20 grains lighter on avg, than the previous batch.
So, once I figured out my case problem, I went to work with the 140 PT. Figured it might be a better bullet to take the speeds the 264 was kicking out bullets. Again, Retumbo shot some pretty good groups.
Well, Retumbo just wasn't doing it for me. The speeds were still very erratic, no matter where I loaded them.
So, I turned to QL, looked like 7828 and RL25 (140 Ballistic Tips 2nds)held some promise. At this point, I didn't really care what the speed was, just wanted something in the 3000-3100 range. Well, 7828 didn't do much for me in the speed department and accuracy wasn't that great. Well, then I turned to RL25... It shot pretty well across the board as I worked up to the max charge for my rifle.
Well, looking at the 67.6 group looked pretty good, so I went back and loaded up some more to verify them. Mind you, I didn't have a chrono for any of the load work up, I was just going off of any pressure indicators and such. I was tired of hunting for speed, figured it would be fast enough no matter where it came out.
I shot this group the next time out.
I figured what the heck, I will leave it alone. I had a chance to get down to the long range and do some shooting, so I was still unchronographed at that point.
Well, When I was zeroing at 300 yards, I shot this group.
That brought a huge smile to my face. I knew that would work. The rest of the day, I commenced to banging steel at 600.. It worked really well and was super consistent.
Well, it was still kinda nagging me a little, as I wanted to know what the speed was, so I took it back to my 100 yard range, broke out the chrono and shot this group.
I was very happy with the speed, REALLY happy actually..
I shot a few more, again, just to make sure it wasn't a fluke.
So, then I went back, just to see if it would work and loaded up a few of the 140 AB's I had left, same die settings at the 140 BT, powder, primer, all the same..
So, I finally found two loads that shoot excellent, time after time. I shot about 50 rounds through that rifle over a few weeks, not letting the barrel get hot at all, and it still just kept putting bullets on top of bullets.
The 140 AB's run a touch over 3200 in my rifle. I am very happy with the combo.
I would give a look at RL25 if you can get it. Also, if RL33 (or VN570) ever hits the market, it should be a GREAT powder as well and probably allow you to get close to 3300 with a 140. So far, I have loaded the same cases (newer lot) about 7 times, annealing every third time and I haven't lost a case or had a single problem. I won't likely be messing with it, but it would be worth a try. Good luck, hope you get similar results. I was a little down on the 264 till I figured it out, but man, once I did, it SCREAMS and is very accurate.