FX Impact 25 and H&N Barracudas

Ginuwine 1969,

Do you mean with the Impact or BT 65? I'm assuming you mean Impact since you mentioned the Baracuda's. I'm still playing with the settings trying to get the 30fps spread down; the rebuilt regulator is really no better than the one I had. I'm finding the fps spread changes based on the power level settings which isn't intuitive to me. "X" volume of regulated air released on setting 1 to Max should have the same effect in my book but that isn't happening on the Impact. Accuracy at 50 yards for the new/accurized .25 barrel is now very good. With sorted AA or JSB 25's and the power turned down it is now shooting one rough hole inside a 3/8 "kill zone circle" at 50 yards except for a flyer (or me) for an entire magazine. Haven't had a chance to take it out to 100 yards or work with the new 30 barrel yet. Those little pin holes you see around the hole are the lead fragments splattering back when one pellet lands right on top of the other pellets already there.




I had some time over the weekend so I built up layers of aluminum to sit between the scope and the bottom of the rear scope mount so I could 'point' the scope down enough to make it usable in the actual cross hairs. AoA reported parallelism between the scope mount and receiver on my gun and all their inventory to be about .001 (they are basically both pointed straight forward so the pellet never crosses the scope line). My shim needed to be .0295" thick to get the pellet to hit at cross hairs from 10-50 yards in the center of my scopes range. I'd ask the machinists here to weigh in on whether they think a whole batch of rifles being off by 3/100" is normal for CNC machine work.

Zebra,

It ate a big tin over the weekend. Got a rough guess for me on number of shots to settle?

Dsdaystate,

The above target was shot with JSB 25s at 840 fps average (15fps spread). Here are the present settings for my rifle and that pellet. But remember I don't have a stock barrel - I have a new one selected by AoA that was then 'accurized' (whatever that means).

By the way, the Air Arms 25 are right there with the JSBs. I haven't found good accuracy with the Baracudas or Hunter Extreme or JSB 34s yet. I have a tin of Vortex Supreme 20g's that I haven't sent downrange yet. The 25s are stacking at lower speeds, but if I push them up to 910 which is where BWalton (the ground squirrels nemesis) had my BT 65, the accuracy fell apart on my Impact.

The downside to that accuracy is it is only 37 fpe of energy. My Airwolf .22 does the JSB 18s at 935 fps or 35 fpe. So for the same accuracy, I'm currently only getting 2 more fpe (barrel measured) from my 25 Impact.

Verve,

If I get time I'll stretch it out to 75 or 100 this weekend and see what happens. If the new/accurized 30 barrel shoots like the 25 barrel (I haven't shot it once yet) I may hold onto those two barrels and get a new Impact receiver (including the regulator) from the next batch of Impacts that comes in this fall hoping that fixes both my open issues.

dsdaystate,

No, my new barrels both have extendable shrouds. Yes, mine originally was not accurate (1" + groups) at 50 yards with both .25 and .30 barrels. Baxter and I both think the BT 65 was damaged in shipping - this is how I found it when I got home. That two guns damaged in the last few months by USPS this year, and I still haven't got the first claim resolved!



It was insured, so it's going back to him for inspection.

Verve,

My reg is also up around 150 bar now (my exact settings are in a post above).

I'll move from the 25g to the 34g and see if that helps with fps variation today. I don't have a pellet gauge for .25 (yet) but do sort pellets to 1/10 of a grain on my Gempro 250 for accuracy shooting.