You will never see them cross over into other brands of rifles and that is almost always the kiss death. Very few WSM and WSSM rounds have made it to sticking around long term, and then sales will never be high. We all know what happened to Remingtons try.
The 243 WSSM and the 270 WSM, 300 WSM and the 325 WSM seem to be the only onesthat stuck and to my way of thinking, remotely make a bit of sense.
Most of the smiths I know haven't even bought reamers for anything else, if that. I had thought about making a 25 WSSM but my smith said that I either had to rent the reamer or buy one. I was going to use a Shilen tube so I called Doug and asked if he could chamber it. I hadn't seen the 25WSM on his list, nor many others for that matter. Basically his response was that nobody was asking for them in anything else other than the few I listed.
Hhe did admit to haveing a 25WSM reamer, but took it off the list after sending out 5 barrels and having 4 of the 5 call him back in the end complaining that his barrels didn't shoot because they had been unable to get their new rifles to shoot well. I don't think it was an issue with the Shilen barrels.
In talking the guys at Sierra, they were reluctant to endorse and get on the band wagon because they had been unable to duplicate all the hype from Winchester and Remington about the short mags advantages other than a short action length. They had asked for THEIR test data and had been refused.
As we all know this whole thing wasn't a new idea. Whether you give Rick Jamison credit or read further back and give Ackley and other wildcatters the credit the idea wasn't new. The advent of some of the newer powders may have even made the ballistic claims true . But a 30 caliber mag is a 30 caliber mag and the formula for reoil is still the same, riifle weight, bullet weight and bullet speed are the critical data. So even if you use a short action, is the average shooter going to really cycle it that much faster? Is the action just that much stiffer that you can demonstate an increse in accuracy? Last but not least how light do you really want your 30 caliber magnum rifle? Even though they were built on a short action most of the 300WSMs I have seen have a mid weight barrel to get the weight up to where it doesn't kill you to shoot it.
Sadly I see Rugers efforts to build their own cartridge lineup as a marketing issue more than anything else and I don't think it's going to be a success in a bad economy and declining numbers of shooters and hunters demographically. That doesn't even address if they have a ballistic advatage as claimed.
Nope, I look for nearly all of them to fail and those that do survive will only be chambered by Ruger.