Air force Condor / Texan Tune concepts ?

[Shooting Targets]

So as I go about tuning my texan .308 I have a few questions and concepts I need answered. 

So my question is related to shot count and accuracy along with fill pressure. 

So is the shot count pretty much set to a specific count vs the bullets weight and power settings?

Meaning the sweet spot of these guns seems like a 500 to 1000 psi drop from the tuned PSI starting point.

So my question is as you tune the gun it appears that if you shoot heavier pellets/bullets you start at a higher fill pressure and go down 500 to 1000 PSI. If you shoot lighter pellets you want to slow down the speed so you back off the power and thus as a result of backing off power you need to reduce your fill pressure as well. As a result your fill pressure is less and you are unable to use the higher fill pressure for more shots ????

A few examples If i shoot 
156 Grain bullet it needs Mid to full wheel power settings along with starting fill of 2800 psi fill shooting down to 2100 psi. This gives me 8- 12 shots for 50 to 100 yard target without much velocity change.
so lets say I shoot a 
50 Grain bullet needs low to mid power setting at about starting fill of 2000 PSI down to 1400 psi and shoots about 8 to 12 shots 50 to 100 yard zero ?

My question is this assumption correct ?? I thought that since I am shooting a less heavy pellet I would be able to get more shots but due to the nature of the Condor / Texan valve build the pellet and PSI starting and ending point adjust accordingly and thus as a result Shot Count does not increase all that much??

The advantage is in using lighter pellets is I get a starting PSI point that is lower and more shots out of my filling tank because 2900 PSI is not needed and 2300 psi or lower is the true tuned PSI for the pellet weight and power wheel settings??? 

Thanks any info to give me on tuning shot count vs accuracy vs fill pressure would be great.

Jay

 

[crittahitta]

I don't understand why you would change your fill pressure because of bullet weight? Just find the highest fill so there is no valve lock. Then you would get more shots with a lighter bullet. I think. Do you have a chronograph? That would solve your question. By the way what kind of fps are you getting with these different bullets? Assuming you have a crony. Im interested in getting a Texan after I save a few bucks this year. My condor starts shooting good about 2800 down to 1900 psi

 

[Shooting Targets]

Crittahitta, hello thanks for the reply. So I do have a chrono as well. So i have filled up as high as I can go without valve lock on both pellets. There are different fill PSIs if that makes sense. So on lighter pellets i get valve lock at the 2400 higher PSI. So I have to reduce my fill down to around 2100 to 2200 for 75 grain bullets. When I shoot 158 grains i can almost fill up to the 3000 psi without valve lock since the bullet is heavier and from my undertanding the texan and condor have a feedback loop to push more air out when the pellet is heavier. Thus you get valve lock at the same psi with the lighter pellets. I hope i made sense lol ! 
I guess my problem with that is I have to lower the PSI down to avoid valve lock while at the same time I would like to use the entire bottle of air at 3000 psi to get more consistent shots. I guess in a sense if these guns had a true regulator it would do that?

I think the issue is the valve springs in comparison to the weight of the pellet determins valve lock at a specific PSI. I was trying to find some way of shooting lighter pellets at 2800 psi for more shots and run it down to 1500 yet get a consistent shot string but I just do not think it is possible ?? I might be missing something thou. Your thoughts ?

Jared

 

[Willie14228]

Jared your on the mark, shooting big bore is a step to the left in air rifles.
The way to be really good is to do exactly what your doing. Big bore rifles like the Texan pushes the envelope limits. 
My understanding of the valve system used in the Texans is they were purposely built to act the way you have found they do. This opens the gun up to accurately shoot a wide selection of shot weight and types, through the use of tank pressure and the fine tuning.

 

[Shooting Targets]

Willie, thanks for the reply, it is always welcome.

Looks like I will be carrying a small tank on those all day hunts. I usually start out squirrel or rabbit hunting walk a bit then sit down wait and do a huge walkabout all day long. As it gets dark that is when I call for Coyote, fox and coon. I like the .308 cal since it has enough power for all types of animals. That said I hate to try to manage 2 guns in the field thus my introduction to the texan .308. It just not very fun backtracking to the car for another caliber for coyote hunting, most of this is done in the morning and at sunset. Squirrels are the brighter parts of the day. Anyway, with .308 I should be able to pull of a lot of shots with a small refill tank and watching my air consumption.

Now that my expectations are set on shot count, It comes down to tuning the gun for the best accuracy and bullet weight. 

thanks, 

Jared