MTNGUN
I just logged on to the forum for the first time yesterday and was glad to find someone else interested in the .25-300wsm. I've gone as far as having the gun built, and I'm waiting, not so patiently, for RCBS to finish my custom dies. RCBS estimated one more week. I started out with a Ruger No. 1B that was chambered for a .257 Arnold Mag. (7mm Rem. Mag. necked down to .257) I enjoyed this round so much it only took a few years to shoot the barrell out. I was going to have Arnold Arms Rebarrell it again, but as near as I can tell they went out of business. I was calling around trying to decide what to do next when I found out that the folks at Montana Rifleman (Kalispell, MT) had a chamber reamer for the .25-300WSM. I kind of departed from the norm. as far as the WSM's go by using a single shot action. The reason I did this is because I'm left handed and I'm limited to short action bolt guns. The other thing I did different is I don't mind long barrells and I like the added velocity. As a result I ended up with a Ruger No. 1 with a 28" stainless steel tube that is almost exactly the same length as my Ruger M77 Mark II with a 24" tube (No bolt, shorter action). I suspect velocity to be compairable or slightly less than what I got from the .257 Arnold. This is no 25-06 it will be more in the .257 Weatherby range if I'm correct on the velocity guess. I will check back with you when I get some loads developed. If any one else has information on loads I would be happy to have it.
Mat