Shot Count?

How many useable shots before it falls off the regulator.

Yes. I would say the number of shots before the pressure drops to the point your shots are no longer acceptably on target. A given drop in velocity will have a greater influence the further your target so you may be able to get a higher useful shot count if you are shooting at close range. 

Yes, on a regulated or not regulated I find that my groups start to drop shift and some guns just become erratic. How depending on how your regulator is set you may be able to get a few extra shots below the regulator pressure gauge, if you’re gun has an external gauge. What pcp do you have? Just trying to be helpful 

"shot count" means how many shots you get within a tank fill that are usable shots within a given ES (extreme spread) needed based on the range you are shooting at. This is regardless of the airgun being regulated or not. Typically a 4% ES is good for under 50 yards for good groups. At 25 yards or less the ES can even be higher with good results. A 2% ES is good for above 50 yards and so forth. I personally strive for a tune within a 2% ES regardless of the distance I am shooting at, but that is just me being anal about my tunes. I have a compressor to do the pumping of air into my guns, so that makes a big difference when considering ES within a fill/string which actually determines the shot count.

I do have experience with the guns that you have, however I have owned many fx guns right now just the impact mk2 25cal for slugs and Edgun .22 Daystate red wolf 22cal hp. The fx guns all the ones that I owned in the past wildcat mk1 25cal and.22 crown 25cal same with the impact when I get close to or the regulator the group just simply drop. And if I would shoot @30yrds I would be able to get more useable shots but I am generally shooting @75-125yrds mainly 75yrds. So @75yrds yes I will experience drop much sooner than if I where shooting @50yrds or less. In the past I have noticed with the wildcat.22 @30 I would 8 more useable shots than if shooting @50. I’m certain that you’re going to be very pleased with the tac compact. The posts that I have read with tac compact have all been good, I have had very good luck with all my fx products and have thought about getting the exact gun you’re ordered, I like short guns they seem to maneuver easily in barns and squirrel hunting. Good luck 

Don't fall for the "gotta have a regulator" crowd. There are many great guns that are not regulated, and non-regulated guns are far superior for the hunter due to the issue of regualtor creep and increased number of failure points and methods. It's "cool" to have one if you are into appearances or you shoot from the bench where you can blow off the first few shots to settle the reg. For a grab and shoot gun, I suggest you go without so the first shot will go right where you want it to.

Not everyone is impressed with the regulator whizbang crowd..

Surely depends on what you are using the rifle for!

If target shooting it would make a difference when your fps drops. 

If your hunting knowing how many shots you can get before the fps drops shouldn't be a problem, unless you are shooting loads in a session.. 

Just how many shots do you want to take when shooting? 

Don't fall for the "gotta have a regulator" crowd. There are many great guns that are not regulated, and non-regulated guns are far superior for the hunter due to the issue of regualtor creep and increased number of failure points and methods. It's "cool" to have one if you are into appearances or you shoot from the bench where you can blow off the first few shots to settle the reg. For a grab and shoot gun, I suggest you go without so the first shot will go right where you want it to.

Not everyone is impressed with the regulator whizbang crowd..

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Whizbang crowd LoL Yes they’re making guns now without Regulators that are getting decent shot counts.

Just keep the storage pressure equal to reg pressure then no reg creep. You can still take that last couple "right at reg pressure" emergency shots b4 filling too. Just fill it b4 shooting. I do prefer unregulated guns just grab them and always be dead on first shot with no worrying about blowing off/wasting the first couple of shots routine or missing that first shot or any shot after storage within its useable pressure range.