I have a 264wm and with 64.5 of retumbo and a 27" barrel my 147s are only running 2990. That 3240 is cruzin'!!!Most your questions have been answered, I'll just throw in my experience with a .264 wm.
Using Retumbo, Federal 7mm rem mag brass, and CCI large rifle mag primers, it is sending 147 eld-m's at 3240 fps into tiny groups and low s.d.'s. It has a 26" 7.5 twist barrel. I have no experience with t 6.5 prc. I see it as a good option if you do not reload and want a 6.5 that performs better than a 6.5 creed. The factory ammo for it is cheaper than other comparable cartridges, such as a 6.5x284.
You maybe able to add a bit of powder to that load safely. Do a little scouting around on the web for yourself and work up slowly. Published data for the 264 win is pretty conservative.I have a 264wm and with 64.5 of retumbo and a 27" barrel my 147s are only running 2990. That 3240 is cruzin'!!!
I am using HBN coated bullets, so don't try this charge, but i'm using 69.5 grains of Retumbo. Most people with naked bullets end up around 68ish grains as stated getting in the mid 3100'sI have a 264wm and with 64.5 of retumbo and a 27" barrel my 147s are only running 2990. That 3240 is cruzin'!!!
I’m pretty biased on this one. I’ve had at least one 264win in my safe since 1995. It was (and still is) 6.5 cool before 6.5 was cool. It will do everything you are hoping to do. If you go with either 264win or 6.5PRC, or any other 6.5 make sure you run at least an 8 twist a 7 twist is ideal for long range hunting and shooting. A lot of the factory 264win stuff is built with a 9 twist, which is marginal with 140g class bullets and a total no with any of the heavier stuff.
I’m 99% done with my latest 264win with a 32” bartlien 8” - 7” transition twist. I used a custom 264 win reamer to be able to seat the 155-160g bullets properly. I’m hoping to see 3,125 - 3,150 with the 160g Matrix.
I haven’t had a chance to see a 6.5PRC in person yet. I can’t speak to (or against) the quality of the Hornady PRC factory brass. All I will say is there are several choices of 7mm magnum brass that necks easily 264win and even good factory headstamped 264win brass.
There really isn’t much difference in performance. As stated above, if you want easy factory ammo get a 6.5PRC if you load a 264win is a good choice. Lastly, there are other choices you should also take the time to investigate a 6.5 Sherman based on an improved 280 Ackley or a 6.5SS, I’m
Not sure if the parent case for that one. Just message Elkaholic. The performance is on par with the 264win. I will be building a 6.5Sherman for my wife soon.
I was reading several of the post about the 6.5's. What is the best free bore or throat length to run the heavies or is there a good mid point where the 140 to 160 grains will run. Personally I have never run anything under 140. I burned out my 6.5X284 Norma (4700+ rounds). I like the ideal of the 160 bullets you mentioned in the magnum. I haven't reviewed the 26 Nos but is it a higher speed round then the 264 win mag. Do they hold the same powder charge or is it a little more? Its easier to be at the bottom end of a case capacity charge with a stable load then to be pushing it really hard to get the next stable node.
I would say pretty dang fast out of the .264. I shoot 147's at 3240, and hear of most people that load them up to their full potential sending the 140 class around 3200. A 124 hammer (just a total guess) would probably be capable of reaching 3350 or so with the right powder. I don't thing 100-150 fps is too much to expect from dropping 17 grains in bullet weight......So what kind of speeds can be expected out of the 124 Hammers in both the 6.5 PRC and the .264 WM. Trying to look around for cartridges for a future hunting rifle build and these are two of the cartridges I’m looking at.