My 24” Shilen shot my Center X about the same 1030-1050fps. In all honesty I haven’t been very impressed with mine as far as accuracy. My 21” Green Mountain barrel shot a bit better over a wider selection of ammo than this Shilen is so far.
Get your long britches and tick spray, we goin' in the weeds. This is long - but
the lessons I've learned are worthwhile for anyone traveling the rimfire road.
Your issue may not be the barrel per se. My current satisfaction with my RimX was preceded by weeks of frustration... had anyone asked me three weeks ago, I'd have parted with the rig for cheap and not looked back. Here's the story.
I
had two problems, not just one: chamber and scope.
Chamber:
My Shilen barrel started as a 28" blank cut to 26" and chambered by my longtime friend and gunsmith well-known & respected in our region for his centerfire barrel work. I wanted a near-copy of the RimX he had built for himself - but he ("Smith") was reluctant to do the chamber work because of his relative inexperience with .22s and the relative difficulty (compared with centerfire) of machining with a tiny .22LR reamer. But his RimX with 26" Shilen that he chambered is a shooter, and he agreed to do my barrel as well as its literal twin for another buddy ("Buddy") of mine.
So Buddy's RimX is in an MPA BA-Comp chassis, mine in MDT ACC. His barrel is 22" while mine started at 26." Both have Trigger Tech Diamonds and mount gen-3 Vortex Razor 6-36x56 scopes.
Neither rifle would shoot anywhere near what they should. With a wide variety of mid- to top-tier ammo labels, three or four shots of five would be touching at 50 yards, and then one or two would land 1/2" away. Mine was
horrible at 100 yards - ridiculous vertical dispersion. Buddy's was a little better but not much. The ES/SD values of ammo we tried were all in line with their various price points - just slower.
Now, Smith as conscientious and meticulous in his work as any human can possibly be. He and I talked at length; he explained all the research he had done, from Bill Calfey's "The Art of Rimfire Accuracy" to discussions with other smiths to his own experimentation with custom reamers and such. He and I consulted other smiths and experienced rimfire competitors we know.
More than one person wondered if a dragging trigger sear was in play. But Ray at Zermatt said Trigger Tech triggers were usually a solution to this issue, not a cause. So we swapped in a Huber trigger he had in the shop. No difference in performance.
RimX's 6-o'clock-positioned firing pin's open "channel" is prone to pick up lube goo, especially in cold weather. I polished the edges of that channel with 2500-grit automotive sandpaper, insuring that running the bolt left as little marking on the bullet as is possible for a repeater. Again, no improvement in the flyers.
I couldn't live with the slow velocity I was seeing in my last case of lot-tested Center-X, so Smith cut the barrel back to 22 inches. Velocity increased 30 fps with the different ammo labels, but inconsistent performance remained.
One of my buddies mentioned
Modacam Custom Rifles, which is a little over 2 1/2 hours' drive time from my home. I made an appointment with
@jelrod1 and left my rifle with him. He pulled the barrel and checked everything including slugging it again (as had Smith), and, as anyone who knows him would expect of Smith's work, found everything to be correct - except for what appeared to be a small concentric ring just in front of the chamber that could have been mistaken for carbon. I had checked for this sort of thing... the ring was so small that I hadn't seen it. So Jonathan touched up the chamber - just touched up, no setback- with his reamer. He screwed the barrel back on my action, mounted it in his chassis, mounted his scope, and tested with my Center-X ammo.
The result was two 5-shot ragged-hole groups at 50 yards - I have the test target. Second group was 1/4" at most.
Yay. I drove back over, picked up my barreled action, stuck it in my chassis, mounted my scope, hit the range.....
... and cussed all the way home. Flyers. Not as bad as before, but they were still happening.
So I swapped my barreled action into the MPA BA Comp chassis that has held my Vudoo for four years. Still Flyers.
So I pulled off the gen-3 Vortex Razor and replaced it with the identical scope off my Vudoo.
Bingo. Flyers all but disappeared.
Scope:
This is my second gen-3 6-36x56 Razor. I really don't want to hear "well it's a Vortex, of course it broke" because I also had a $13k skeet gun whose barrels rusted black in half a wet day's shooting and had to be replaced, and I drove a Porsche for several years that shipped with one tire the wrong size. If it's made by humans, it can be messed up. Historically, Razors have been hugely reliable wrt tracking and reliability.
So Vortex turned the scope around in a week, finding a loose lens and replacing the erector, also fixing the early-release scopes' gummy turret feel. Now the turrets feel like my remaining gen-2 Razor (I've had three, two of them upgraded to gen-3s).
Results:
I've put maybe 400-500 rounds through the rifle since Jonathan worked his magic on the chamber. Accuracy just keeps getting better. Yesterday, I tried Eley Ten-X, no-longer made Eley Edge, and CCI SV. The Ten-X gave me a couple of 1/4" center-to-center 5-shot groups at 50 and 1/2-3/4" groups at 100. Even CCI SV kept all rounds commendably tight - sometimes amazingly so - with the exception of one round that landed 2" out of the group at 50...
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So that's the story. My main lesson from this, which Smith had emphasized early on, is that chambering a .22LR is a really persnickety thing to do. I will be surprised if Smith does any more rimfire barrels; he stands behind his work and was very bothered that Buddy's and my rifles didn't meet the accuracy he expects from his work. He and I have been friends longer than he's been my riflesmith, so we have chalked this up to experience.
The season's first little 50-100-150 yard gallery-style rimfire match is set for 12-March. I'll be shooting the RimX. I've been at or near the top of the leaderboards of this little series for three years with my Vudoo - so to say I'm gonna shoot the RimX says I have confidence in it!
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I hope a few readers find this epistle useful. It's been an interesting trip.