The GP100 as a CCW Revolver
I started carrying the GP100 years ago. I'll share with you what I've found to work very well for me in a CCW carry system. Most any holster and speedloader carrier that is designated for an L-frame S&W will work for a GP100; when you search for GP100 holsters and accessories and fail to find models for the GP100 listed, check the S&W 586/686 L- frame because I've found them to be almost 100% interchangable. Two great belt scabbards for the GP100 are the Desantis 02 speed scabbard:
http://www.desantisholster.com/002.html
and the Tauris enhanced high ride belt scabbard made by Mike Taurisano:
http://www.taurisholsters.com/enhighride.cfm .
Both of these belt scabbards are well made (cowhide) and are affordable. I have used the Desantis 02 scabbard with my GP100 in competition night matches. It works very well; I personally think it is a better made holster than the Galco FLETCH.
It is possible to carry a GP100 IWB, but to do so, you have to have the right holster. I went with a Ken Null UNS:
http://www.klnullholsters.com/ . The Null UNS is square shaped and distributes the weight of the GP100 over the entire length of your lower hip and your right glutemus maximus instead of your beltline. The GP100 conceals VERY WELL in this holster: zero movement/shift while wearing and extremely comfortable. This is a horsehide custom made holster and is not cheap, but I dare say it is the best IWB holster I have found for a medium/large revolver. Any of these holsters need a strong belt. I have used the Tauris 1 1/2" and Null 1 1/2" duty belts and have found them to be just right for me. Desantis, Galco, Bianchi, and Milt Sparks all make super strong belts for CCW. Find one that fits your taste and budget because they all work well.
Safariland speedloaders in the Comp 2 design and the HKS 586 are the best for carry in my opinion. The Safariland Comp 2 is a push feed and is very fast. The HKS 586 is a twist feed and is not as fast, but very sturdy and probably more durable. The choice between these two speedloaders is up to the wearer. They are both good choices. The Desantis Second Six speedloader holder:
http://www.desantisholster.com/a35.html for the HKS 586 works for both speedloaders previously mentioned and rides around the wearer's belt with the rounds in the speedloader strattling the belt while inside the speedloader carrier. This method of carry cuts down on the speedloader's bulk by up to 50%. The Safariland Comp 3 loader and the Buffer technologies Jetloader are large spring-loaded speedloaders that are super fast but are really too big for carry unless you become really creative. I use the Comp 3 Safariland and the Jetloaders as support reloads from a vehicle or rollout bag.
The Bianchi Speed Strips:
http://www.amazon.com/Bianchi-585-Speed-Strips/dp/B000ATX9J0
(the Amazon price is for a bulk department purchase, hence the $90+ price)
are excellent for flat carry in the pocket. They also make an excellent choice as support reloads carried in the pocket backing up your speedloaders or serving as a reload for your backup revolver like say an SP101 Ruger.
I really like the GP100 compact grip offered by Ruger with wood or Derlin polymer panels. They really cut down on the grip size for carry.
http://www.gunbroker.com/Auction/ViewItem.asp?Item=60123304
The fixed sight GP100 models can be found for incredible prices:
http://www.gunbroker.com/Auction/ViewItem.asp?Item=60143048
Take Care.....