Best tethered pressure for .457 AirForce

[ctshooter]

I am getting a high flow regulator to be able to shoot my AirForce Texan SS CF (the latest version) .457 tethered, but I'm wondering what pressure the gun shoots best at. Fill is up to 3600psi but I'm sure the best shot is probably in the ~2,500-3,000 psi range. Has anyone tested is this out?

 

[Chickenthief]

Does'nt matter!!!

As long as you keep regulated pressure the same the shots will group the same.



My Texan .50 is usually shot regulated to the max. 250bar-3625psi and with the right bullet it will stack then on top of each other at 55yds all day long (as long as pressure stays the same, ie does not fall out of regulation).



You can experiment with lowering the set pressure (200psi at a time?) and shoot 10 shot groups (at the very least 5 shots!) to see if barrel harmonics will shrink your groups further. If that sounds expensive then you need to start casting your own bullets, and that way you can control quality to boot ;-)

I dont use silicone oil, pixie dust or pulverised unicorn pecker on my bullets. I size and lube just the same as i do for my powder burners and it works a treat! Only change is i only fill the bottom grease groove for lubrication of the barrel.

 

[ctshooter]

True - if pressure stays the same, the shot will stay the same. I guess I was referring more towards the most powerful shot pressure. Will I get more power shooting at 2600 psi or 2900 psi. Happy to test this out once ranges open again, but was hoping for a starting point.

 

[Chickenthief]

The Texan is unregulated per se and the exercise it to get shot number one on the rising side of the pressure/power curve, shot number tow at the top and the theird shot on of the declining side. Shot two at the top and 1 and 3 as close as you can get.

Did that make sence?



If you're a hunter then please:

Fill to max and shoot 3 shots.

Regulate what you want in regards to barrel weighs and what not. In the end is what you will get in the woods inregards of shot placement.



I have never ever had a shot pig run up to me demanding more power, they just tend to deplete hydraulics at an alarming rate ;-)

 

[ctshooter]

I get it, you don't have to dummy it down like I have no idea what I'm talking about. 

To my original question - what is the psi at the peak of the power curve? I'm shooting targets, not Bambi and want the flattest possible trajectory.

 

[Chickenthief]

3625psi and max. wheel (factory 8 and i havent changed for my shooting)

Factory (8) will give you shot number one on the rise and so forth.



You might gain a smidgen by lovering max pressure but then all shots will be below per se and dive into the target as pressure decreases.

 

[ctshooter]

It's the latest CF SS model - no power wheel.

 

[Yo]

Heres what to do if you need MAX POWER. Go run it over a CHRONY. Note what pressure gets the HIGHEST FEET PER SECOND. Set your regulator AT THAT PRESSURE. Good Luck. Yo!

 

[Yo]

FOR BEST ACCURACY. TETHER AT 2000PSI SHOOT A GROUP AT 50 YARDS THEN GO UP 2100 SHOOT A GROUP THEN 2200 SHOOT A GROUP THEN 2300 SHOOT A GROUP AND SO FOURTH TILL YOUR GROUPS START TO GO BAD OR ALREADY AT 3600PSI. BEST GROUP PRESSURE WINS. AT THIS POINT YOU NOW KNOW WHAT PRESSURE YOUR GUN LIKES. STARTING AT ONLY 2000PSI SINCE YOU STATED YOURE GOING FOR ACCURACY. DOCUMENT IT ALL. GOOD LUCK. Yo!

 

[T3PRanch]

The weight of projectile also figures heavily into your question and I did not see what weight projectile you proposed!

 

[Willie14228]

I have the latest factory cf and as T3PRanch has indicated a lot will depend on the grain weight you are shooting my power curve was peaking at 3300 but there are some things you need to understand 

1. the gauge on these guns can be off as much as 300 psi and even dead on the scale for the psi is so small getting an accurate reading 

2. The grain weight of the bullet can change the start of your power curve by as much as 800 psi

3. Every gun is different this is even more true in big bores 

Check out Mr Hollow points Website he has some very good advice on setting up your gun and fine tuning using the wheel 

 

[ctshooter]

I've only had the chance to shoot my .457 Texan one time to sight it in with a few shoots before it got to dark to see. Then COVID kicked in. Once my range opens I'll be shooting it a lot more.

I have a few boxes of the NSA 240gr and 254gr slugs. That is what I will be shooting to start with. I've been reading the threads here though and I will try some other brands once I run out of these.