Got another idea since your going with the Mrod to get the Guppy 4500 psi carbon fiber tank from Air Tanks For Sale. It is light enough to carry with you in the field in a backpack. You can then top off your rifle for about 13 times or 208 shots. Cost of the tank and fill system about $400
Not a bad idea. I have been looking at the exact same setup. Again, would it mean that if I reduced the power to half, I would get twice as many shots per fill? 208 shots is technically not that bad. still, 400+ would be even better.
As I am writing this, I realized that I am "testing" out a new job. The scuba shop is not that far from my new work place and as such it wouldn't be that big of a deal to drive there and have the tank filled. However, having to do so for every 200 shots would be not cheap, as they charge $12 - 15 bucks...
Kmd the main reason I suggested the Guppy for a fill tank was for mobility but of course it is the least cost effective way size wise to provide air to your rifle. If you don't travel far from you vehicle you could buy the Tiger Shark 72 cu ft tank and get 47 fills for your Mrod or 752 shots. Or get the Great White 97 cu ft tank and get 63 fills or 1008 shots per tank. One thing about PCP rifles you need to watch out filling your rifle in dusty, dirty conditions with wind blowing where you could introduce dirt into your PCP.
I think also you will find it is not feasible to cut the power level down that much in the Mrod. The rifles are set up for a certain power range and where you can make it a little more efficient you can't make it shoot at half power with out major component changes. In a way I was thinking the Hatsan rifles might have been a better choice. In my AT44 10 .22 I get 24 shots per fill within 25 fps and the rifle has a removable air reservoir to allow you to carry spares. Depending on the model of Hatsan spare air reservoirs cost $90 to $150. Just some more thoughts. Bill
Thanks,
Kmd