FPE from slugs versus pellets-an example

[HogKiller]

I tried some of the .22/32.3 gr "ATP Smooth" from a 12 land and groove, unchoked LW barrel (standard 1:17.7 twist rate) and was thoroughly UNimpressed.

My understanding is that the RTI/RPB LW is essentially the same barrel as what I tried, with the only difference being a 1:16 twist rate.

The ATPs from my barrel were tried at various speeds.....870 seemed bout the best, but even then it was throwing some that would miss a 9x11 sheet of paper at 100yards.

I hope your barrel shoots them better than mine.

It's not always the barrel, unless you make sure not one extra molecule of air is behind that slug coming out of the barrel it'll skew it. Ok slight exaggeration but I think you get the idea. It does make a very significant difference.

 

[Franklink]

It's not always the barrel, unless you make sure not one extra molecule of air is behind that slug coming out of the barrel it'll skew it. Ok slight exaggeration but I think you get the idea. It does make a very significant difference.

Kinda vague but I'll bite.....are you saying the magic recipe for figuring out slugs is making sure that no extra air is used in the shot? As in balancing reg pressure and hammer spring and hammer weight, etc? Or perfect barrel to slug "fit"? Cuz if it's the latter we're back at some barrels shoot a certain projectile well and some barrels don't.

Somewhat away from the original topic, but that .20 Lothar and the 18.9gr NSA slugs don't seem to care about the tune or the speed. They're crazy accurate from 850-940, with various reg pressures and valve impact variations. And by crazy accurate I'm talking averaging 5 shot groups @ 100 at right around MOA. Various speeds and "tunes."

 

[JungleShooter]

Thanks, Frank.
You're mentioning the specs of your barrel — that gave you thoroughly unimpressive results :
• unchoked
• 17.7" twist
• LW barrel
• 12 lands


➠ I'm sorry to hear that.
Well, I wonder how my guns compares — probably not much hope there....:
I have a .22 Prophet 1 — and a .25 Prophet 2:

.22 Performance Compact
CZ
choked
15.75" = 400mm

.25 Performance Compact
RPB
only slighty choked, to accomodate slugs
20" = 510mm



I have not had the time to try any 100 yard shots with either gun
—
yeah, I admit, that sounds like I'm sick or something else is wrong with me since I have one gun since over a year, and the other since several months.....


But... — most past outings have been to
be of help to my friends to get infected with the airgun bug
— which means my testing agenda got pushed back, and giving my buddies a good time was top priority.....

Matthias

 

[HogKiller]

Kinda vague but I'll bite.....are you saying the magic recipe for figuring out slugs is making sure that no extra air is used in the shot? As in balancing reg pressure and hammer spring and hammer weight, etc? Or perfect barrel to slug "fit"? Cuz if it's the latter we're back at some barrels shoot a certain projectile well and some barrels don't.

Somewhat away from the original topic, but that .20 Lothar and the 18.9gr NSA slugs don't seem to care about the tune or the speed. They're crazy accurate from 850-940, with various reg pressures and valve impact variations. And by crazy accurate I'm talking averaging 5 shot groups @ 100 at right around MOA. Various speeds and "tunes."

Yep, got that tidbit from Matt Gubber, and OMG did it work. It was in one of his videos, short enough to miss if you weren't listening.. I'd been fighting it in my Mavs then poof they just fell into line.