Reply To: Are FX smooth twist barrels capable of grouping well at low velocities?

Forums PCP Airguns Are FX smooth twist barrels capable of grouping well at low velocities? Reply To: Are FX smooth twist barrels capable of grouping well at low velocities?

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Long_Gun_Dallas
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davelarson

Just shot some quick groups at 35 yards with the FX Royal .177, no wind. The circled groups are with the low power setting and the 7.33 grain falcon pellets. The groups with the squares around them are on high power setting and using the 10.39 heavy’s. It’s much more accurate with the heavy’s, but you can still get reasonable groups like the one on the right that’s circled. And at 20 yards it’s one ragged hole.

Thanks.  That's not too bad.  Do you shoot a lot at that range and power setting?  I've got a crosman 1322 that groups tighter, believe it or not (TONS of testing/tuning and modifications)  But out at 60 yards you're basically lobbing the 22 projectiles.  

 

elh0102

I was at the range today with the Royale 400 .22. I realized I had forgotten to bring any 16 grain pellets, but I shot a couple of groups at 25 yards on low, with the JSB 18. Shot through the chrono, very stable velocity at 500 fps (Huma reg). It shot ragged, one-hole groups. Don't have any idea about shot count, but I'm sure I'd get tired of shooting before running out of air. I have become a huge fan of this rifle, and the original ST barrel. I had a Crown with the Smooth Twist X liner system. It shot good, but needed frequent cleaning. I've yet to clean the Royale after 1,000+ shots. And I never re-zero, POI is steady as a rock. New is not always better. 

That's funny, cause I'd heard the original smooth twists did not like low velocity, so it's interesting to hear they do that well.  But given the feedback, I'm confident I can find a recipe that will work.  Also ordered in a 700mm slug liner, so I'll be playing with both ends of the power spectrum.  Also reached out to TJ to see if I can get a custom liner more suited to shooting low velocities.