Tuning Brocock Patagonia 22 tune

[pesty3782]

I am tuning my 22 Patagonia with the 23 grain RD monsters. Anybody out there have a good tune for me? Currently it is shooting 880 FPS, but the groupings are not there. Was going to try and speed it up to 900 and see what I get...(I think it is the same as the sniper HP just tan)

Tony P.

 

[socaloldman]

Tony I haven't used that barrel but found that the RD's sometimes like slower. Have you tried the lower 800's. Nick

 

[mcoulter]

Hi Tony, I have the Brocock Sniper HR Magnum (a.k.a HP). I assume our guns are pretty much the same and have the LW Polygon barrel. I have found this gun to be quite accurate with JSB Monster Redesigned pellets at 895 fps. 

BUT...

This barrel is THE MOST PICKY barrel I have ever owned.

Accuracy goes down the tubes as soon as the barrel gets a little dirty. In good conditions and with a clean barrel, 1/2 inch 5-shot groups are possible at 50yards. I DO get the occasional flyer but for my purposes I shoot straight from the tin so I'm OK with this.

Oh, while I have tried lower reg settings, I still come back to factory of about 155 bar on the reg and having the hammer spring screwed in about 3.5 mm in from being flush with the back of the receiver.

 

[pesty3782]

This target was at 50 yards off a bipod prone...with lots of coffee on board ; ) Upper right was last target. 880 FPS

Was playing with it today over Chrono and stopped here for now...Looks like reg is set at 160 (At least the gauge says so)...Any further in on the hammer spring speeds go down so I backed it off 1/4 turn and came up with this shot string....Not too bad so Sunday I will see how it groups.....

Shot count: 10
Low: 895
Hi: 912
Avg: 904
Spread: 17
STD Dev: 4.5
905
902
912
902
895
902
907
907
902
902

mcoulter....Same barrel and yes it likes being clean....I got it used and the barrel was filthy....It took a long time to get clean patches through it...

Tony P.

 

[shoot44]

del

 

[pesty3782]

Well the tune printed ok, but I missed 3 squirrels at under 85 yards. Never happens with my 25 cal Vulcan that is a tack driver. Need to take all the tools with me next time so I can try different speeds.

Tony P