Pancho,
You are in luck! There is one company that specifically makes their tubes for a specific size of cap. I have also spoken with them on the phone and know the cap of choice for them is the Remington #11. There is a reason they chose the number 11 size caps, that is because there are actually three cap brands currently available that will fit their tubes.
The company I am speaking of is of course Treso. This is a copy of page 27 of the catalog from The House of Muskets, these are the same folks that brand the tubes and a lot of other accessories under the Treso name.
The good news is that not only will the Remington Caps fit, but the CCI #11, The RWS 1075 and the RWS 1075 Plus caps fit pretty well. I have read for several years about the "non-uniformity" and "inconsistency" of caps. But, I have found they are actually much more consistent in the ability to fit than many have led us to believe.
First of all you have to set aside your prejudices and consider for a second that the Earth really isn't flat just because everyone who was considered an authority said so at one time. Belief of this type seems to be a condition that still exists in the 21st century.
The reason caps that don't seem to match dimensionally fit, is that the tubes they fit on are tapered and not cylindrical in shape. No one has been able to produce (produce evidence of) a standard for cap sizes There are no documents from an organization like SAAMI. Even without this the different manufacturers were able to create cap geometries that would fit some standard tube sizes that have been around for a while.
If you have ever looked at antique cap tins you will often see them labeled "For Colt's Belt and Pocket Pistols," or such like. I have several original Colt's and they give me the unique capability to compare their tube geometry with modern tubes we find on reproductions. I have found that Uberti, Colt 2nd Gen and Colt Signature Series revolvers have tubes that are dimensionally very similar externally to the original Colt's tubes. I can't definitively say they chose Colt's tubes as the standard, "but if the cap fits..."
Using this tube geometry different manufacturers have sometimes chosen different methods of creating a well fitting cap. Since the tubes are tapered it takes two dimensions on the caps control the fit, those being the internal diameter and the "skirt length" which is the interior distance from the mouth of the cap opening to the priming compound. Remington has chosen the approach of using one diameter for both the #10 and #11 caps and they change the length of the skirt to make the fit. Other companies have similar heights between their #10 and #11 caps but change the I.D. to effect a fit.
Look at the most recent version of my cap chart. It is growing, I now have over one hundred and twenty data points for both the Remington #10 and #11 caps over multiple lots. I am adding to the CCI and the RWS measurement pools as well.
One of the things that is confusing to most folks is the apparent difference in heights when you set the caps side by side nad they appear different. They attribute this to no standardization in sizes, but the exterior is not the driver for the fits. If you look at the chart above you will note the second through sixth caps have VERY similar internal heights, then if you look at the Rem. #11, CCI#11, RWS 1075 and RWS 1075 Plus caps they have a statistically insignificant difference in I.D.s. The perceived difference in height is actually in the priming compound volume, not the effecive "skirt" length.
I don't post models on the forum anymore, but I can direct you to another forum where I show the relationships between the tapered tubes (cones) and the caps. When viewing these older posts remember I was still collecting cap data and the dimensions were still converging to the dimensions you see on the chart above. As the sample population grows our confidence in the reported numbers grows as being accurate representations of the average dimensions for each cap. Even so, you will see there wasn't a major shift in dimensions in the last three or four years. Note that some of the manufacturers made some geometry changes they called improvements prior to that, so if you have 5 to 20 year old caps they may vary a bit from these numbers, but you may be surprised because they will still fit the Treso tubes. Remember it is internal height and I.D. that make the fit. You will find Remington chose a different method of effecting that fit 20 years ago, but they still fit.
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For some background and illustrations on the taper fits of the caps on tubes see this earlier post:
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http://www.cascity.com/forumhall/index.php/topic=35422.msg455339#msg455339
For those of you stuck with #10 caps(or simply liking them, that's O.K. too), I show how to modify a Treso tube to be optimized for Remington #10 caps, but CCI #10s will fit as well. If I ever can't get Rem. #11 caps I replace the tube sets on a pair of my competition pistols with Treso tubes machined to these dimensions:
http://www.cascity.com/forumhall/index.php/topic=35696.msg489781#msg489781
So open your mind, and think it through. There is actually method to the apparent madness of the different brands of caps. Furthermore, there is much more uniformity dimensionally within a size per brand than many have believed for a long time.
My recommendation if get Treso tubes in the thread size that matches your revolver (by manufacturer), get Remington #11 caps and don't look back...
Remember you just need a very slight press fit, not heavy fits which split skirts, flare the caps and sometimes require a seating stick to bottom out.
Best of luck and happy shooting,
Mako
