I recently bought an FX Royale 400 in .22, great rifle. Initially, it was shooting the JSB 18 at around 920 fps. Accuracy was good at 25 yards, but chrono runs showed ES of 25-30 fps, and I expect that might be an issue at longer distances. I adjusted it down a little with hammer spring tension, around 900, but consistency was no better, so I figured it was a regulator issue. I returned it to FX for inspection, and in the interim, installed a Huma, which confirmed my suspicion. Accuracy is great and ES is consistently under 10 fps. I stopped my tuning at a point where velocity is 850, with hammer spring tension about maxed out. In other words, as I increase tension more, velocity remains about the same. Since it is obviously capable of shooting faster, I assume I need to bump the reg pressure up a bit. I ended up at around 145 BAR on the Huma scale, but I suspect that is not accurate, since I think it would be shooting faster at that pressure. It's shooting so good I might do nothing, as 850 fps with the 18 is really adequate for my uses. For those out there more experienced with this, if I should decide to increase the pressure again, would 5-10 BAR be reasonable? Any other thoughts?
Tuning question
- Thread starter elh0102
- Start date
I would say yes. Here's the thing when tuning a regulated gun you want to tune the gun to run about 10-15fps slower than your max fps at that reg pressure. So ideally where your at 835fps is where your want to run for best consistency and better efficiency. I would try bumping it up 10 bar and see what happens. Also I've had Huma stickers be off as well so it could be less than it actually says on the scale
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I have royale 400 laminate stock in .22 .It shoots jsb 18gr at 880fps with great accuracy.Stock fx regulator onboard,regulated at 125bar.400cc bottle and have around 95 usable shoots from 220bar to 130bar.It is very consistent.
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That sounds great, hope my FX reg comes back that good. I'm surprised at your velocity at 125 bar. I played with the Huma some more today, and now I'm getting that velocity very consistently also, don't know about shot count. The reg setting on the Huma scale is 150 bar, but without a tester, I'm skeptical of any indicated reading from that taped-on scale. It does, however, provide a reference point, which is useful.
I'll offer a bit of advice to anyone tuning with a Huma reg, measure the length of the reg before inserting in rifle, from bottom to top of the adjusting screw. That's the best way I found to get back to your last setting. The adjusting screw turns so easily, it often moves some in the process of de-pressurizing the rifle and disassembling for adjustment. The FX reg is the more traditional design with large belleville washers. Frankly, I would tend to think it might be more long-term reliable than the Huma, but we'll see.
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