The advantage of bulk fill to me would be the ability to shoot when it is cold. I find the CO2 not so good in the winter. I have all summer to get the bulk fill researched, but I would be using it for dawn/dusk pest control. For plinking in the barn the CO2 and valve mods I have done reaallly helped out. One is a pistol I got from Kirby, I can almost shoot throught 3/4 board now at about 25' and after it warms up and with a 14 to 18 " barrel I sure expect to crack that barrier. However I also have a CDT tuned S1K and it will shoot through the boardeasily with crosman pointed or gamo superpells. It also gived me something to tinker with. It is not cost effective. I would be money ahead if I just initially bought a talon or condor, between shipping and trading up, etc. Not to promote other forums, but this link is pretty good on bulking ang shots
http://www.network54.com/Forum/79537/thread/1236741376/2250+PCP+-+CAUTION-+Lots+of+photos.....
Good shooting, John
PS thanks again Kirby, almost one hole groups at 30 feet with the rifle stock. Thinking of converting one to .177 to shoot pest out of local feed shop. Owner is tired of birds but the fake owls and whistles are not working.
Bentong, I live in Ocala, I go to Jax oncein a while. Give me a hollar and maybe we can get a shoot planned.