Brandon,
Like Hammerspur said, the Sidekicks have been discontinued for 2008. They were using Green Mountain barrels at one time, so either Big Green (Rem) put a halt, or my guess is Green Mountain is too busy building KP1 Knight barrels to mess with a NEF Contract. NEF Barrels are now made my Marlin, the old Marlin inline (MLS-50???) was made by T/C, so my guess is they were not set up to make the muzzleloader barrels. You can however, for the time being, have a H&R/NEF frame fitted for a Huntsman barrel, probably while supplies last.
I have a Huntsman that will shoot every bit as good as my Knights and Whites. I just bought a Sidekick that has not been shot yet. My Huntsman had the best trigger of any rifle I owned, until I boutght the Sidekick. The Sidekick trigger is almost scary, it is so good.
I would also agree with MOdeer on the .25 ACP plug, it just don't get much cleaner than that. 85 grains of FFG 777 under a 300 gr SST, or 200 gr Shockwave over 100 grains BM'3 will do the trick on Whitetails.
Just a little secret, the NEF's will shoot 430-460 grain pure lead .503" conicals into little bitty groups. You can shoot these all day long without swabbing. 80 grains of FFFg 777 with a fiber gasket wad under the above will put an elk down rather quick, and whitetail out to 170 yards. :wink:
There are some downers to the design, but all of mine have been modified to give me what I want. The .25 ACP plug negates the breech plug tool, original breech plug and primer carriers. I had a guy in MB make me two custom jag tips for the ramrod, that actually allow you to patch the barrel without losing the patch and push in pointed bullets. These also thread into the rod to lock it together, very nice. I only use the supplied ramrod for reloading in the field, I use a Knight T-Handle range rod for all range work and cleaning.