I use the same caps. Remington has made their caps 15%, IIRC, stronger to avoid misfires. The added force does make them splay significantly. I've had 1 stick in my hammer hard enough to have to be pried out. I still use them and haven't had any misfires, but I guess that's just the cost of the stronger caps. Older caps I had would sometimes split, but usually much less severely. 8)
I've tried both #10's, and #11's, and both fit nicely on the nipples. There is only 1/1000th
inch diff in dia. They are certianly hot, but I didn't expect this. I have a chart with sizes, but I can't figure out how to post a picture.
I shoot both 36 and 44 Colt C&B, the remington #11's always gave me trouble with splaying, pieces catching in the mechanism etc. I went to CCI #10 and have not had the level of problems with them, they appear to be softer and may split on one side, but come off easily and seem to be real consistent. I do have to make sure they are seated all the way on the nipple, they take a little bit more seating pressure than the 11's.
I use CCI #11 Magnum caps. I have never had a FTF when hunting since I never carry a ML into the woods that has not "proven" to be reliable. In other words, I always fire a fouling shot or two through any ML I am carrying into the woods for serious hunting. A lubed patch down the bore after loading for the woods takes care or any corrosion worries. The only FTF's I have ever had have been when I am just shooting and do not adequately clear any lube from the fire channel. Actually, I have never had any problem with standard CCI #11 caps, but prefer the magnums because the are available and I like the little extra margin. I use Spitfire nipples and have never had one fall off. I prefer for them to "splay" a little so they come right off and I do not have to fiddle around to reload.
I have used #11 caps on my 1858 Remington .44. Had to squeeze the skirts for a good fit. I switched to #10 caps. They fit nice and snug, straight from the tin and never fall off under recoil (good source of chain fire). Both the #10 and #11 will split the skirt and very easy to remove after firing. Yhe old CCI caps had a very stiff skirt and had to pry some caps off with a knife point after shooting. If the caps are blown off the nipple, your nipple may be worn out and need replacing. If they are just splitting like you said, that's normal. Make smoke and enjoy.
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