Well, there went my theory on the 700mm barrel and slugs. Did it at least shoot JSB 33.95 grain pellets well? If, not I guess I'll keep it stock.
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Tuning Taipan Veteran long slug tune
- Thread starter Meanadidas
- Start date
I'll know more next week after I get my order from NSA in. I ordered samples of 24.8gr, 27.5gr, and 31.2gr in .217, .2175, & .218. I don't think the 700mm barrel had a choke and .216" was designed for choked barrels. Hoping the larger diameters will yield promising results.
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I hope you get the results you're seeking with the 700mm CZ barrel.
I can share a few data points that may or may not be helpful.
This past weekend an airgun buddy had me swap out the oem barrel on his Veteran for the 700mm CZ. We also threw a power plenum on.
I also own two Vets, a .22 Shorty and a .22 Long. The chokes on both of my Vets OEM barrels are EXTREMELY tight, in the 0.212-0.213 range, with the rest of the bore being in the more normal 0.217 realm. Both of mine shot pellets up to 18.13 grains really well. Same story with my buddies Vet.
After discussions about the tightness of Veteran barrels he measured the choke on his new 700mm barrel and it is in the 0.211-0.212 range also.
He did some accuracy testing with a couple different slug flavors with the new 700mm barrel and was pretty discouraged by prelim testing. He was also trying out the heavier hammer spring. Through various hammer tension settings, he couldnt keep some of them on an 8x11 paper at what looked to be around 50 yards and was already talking about going back to the barrel that came with the gun. He's still going to do further testing before giving up on the 700mm though.
One thing about that longer barrel, he could really crank the projectiles. I think he said he was getting fps up around 1050 with something he was testing.
If your barrel follows what seems to be a trend with Veteran barrels, I'd expect the larger sized slugs to do worse, but hopefully you'll be rewarded with better results than I just shared. You never know until you shoot to see how they do.
Just to clarify, I'm not bashing on Taipan in any way here. Awesome guns, in nearly every way. Heck, I own two! From my experience though, their barrels are machined with tight chokes that make REALLY good pellet shooters (up to 18gr), but no so much slug shooters. In fact, neither of my Vets even liked the heavy 25.4gr Monster RDs.
Let us know how it goes. I'm very interested to hear about your results.
I can share a few data points that may or may not be helpful.
This past weekend an airgun buddy had me swap out the oem barrel on his Veteran for the 700mm CZ. We also threw a power plenum on.
I also own two Vets, a .22 Shorty and a .22 Long. The chokes on both of my Vets OEM barrels are EXTREMELY tight, in the 0.212-0.213 range, with the rest of the bore being in the more normal 0.217 realm. Both of mine shot pellets up to 18.13 grains really well. Same story with my buddies Vet.
After discussions about the tightness of Veteran barrels he measured the choke on his new 700mm barrel and it is in the 0.211-0.212 range also.
He did some accuracy testing with a couple different slug flavors with the new 700mm barrel and was pretty discouraged by prelim testing. He was also trying out the heavier hammer spring. Through various hammer tension settings, he couldnt keep some of them on an 8x11 paper at what looked to be around 50 yards and was already talking about going back to the barrel that came with the gun. He's still going to do further testing before giving up on the 700mm though.
One thing about that longer barrel, he could really crank the projectiles. I think he said he was getting fps up around 1050 with something he was testing.
If your barrel follows what seems to be a trend with Veteran barrels, I'd expect the larger sized slugs to do worse, but hopefully you'll be rewarded with better results than I just shared. You never know until you shoot to see how they do.
Just to clarify, I'm not bashing on Taipan in any way here. Awesome guns, in nearly every way. Heck, I own two! From my experience though, their barrels are machined with tight chokes that make REALLY good pellet shooters (up to 18gr), but no so much slug shooters. In fact, neither of my Vets even liked the heavy 25.4gr Monster RDs.
Let us know how it goes. I'm very interested to hear about your results.
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Maybe there's gonna be a couple of CZ 700mm barrels for sale in the near future.
At TalonTunes he discloses the twist rate... "Twist rate is 17.7″ (450cm)"
At TalonTunes he discloses the twist rate... "Twist rate is 17.7″ (450cm)"
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If the goal is to use the 700mm as a slug shooter, the idea of chopping off the choke exists. The barrel is plenty long for it. Of course you'd need to have it rethreaded and I'm told by my machinist friend that carries the risk of opening up the bore a little too much. He says I got lucky that the unchoked blank that he threaded for 1/2-20 on my Long shoots so well, with that whole bore opening up theory.
I don't think the 700mm barrels are necessarily "bad" barrels, just that the one I saw this last weekend seems too tightly choked to be a decent slug shooter. At least with what Dan has shot through it so far. They basically have the same problem as the OEM barrels in the .22 Long seem to have, the gun is capable of decent power, but the tight choke only likes pellets with mostly hollow skirts, and so you cap out at 18grains, which can only go so fast before becoming unstable.
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Thanks for the great read! I am in no way suggesting they are bad but they seem to be falling short of being slug barrels as they come from TT. I'd like to have one for my TaipanVL.25 just for fun.
Sounds like they do well at what it was they were designed for... pellets
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That's not my experience at all with my Veteran long in 22cal. The FX 25.39's are the most accurate and I had Tony set up the Huma Reg at 140 for the 25.39's. Outside of that I would make no sense to me to buy the Long version for just 18's. It shoots well at JSB 15.89's and 18.13's. I'll post some results tomorrow. I don't think I'm the only one either.
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I didn't say they've all got the tight choke problem, just the four .22 OEM barrels that I've seen wouldn't shoot slugs or the 25.39s worth a dang. And my accuracy standards are for it to put ten into an inch or less most of the time at 50-55 yards.
If you've got one that shoots the Monster RDs up to your accuracy standard I'm happy for you.
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I'm just surprised no one else has. 1/2 at 50 is not a problem for 25.39's. I'm just shocked that's not that standard for these guns. The standard is 5 shots in 1/2 inch group at 50.yards. More than that and your relying on the shooter.
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I know this thread is old but if you care to know the 700mm barrel at Talon Tunes is unchoked I'm shooting 217 25gr H&N slugs 1/2 in group @50 yards it shoots pellets well also. 4 left in stock I got mine 2 weeks ago.
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That's great news! Unchoked makes more sense, or at least LESS choked than they were around a year ago.
With the news that they're not over-choked now, you've piqued my interest in these again. How fast is it pushing those H&N slugs? OEM hammer spring and reg pressure or big hammer spring and upped reg? Plenum? Curious if there's any diminishing returns with that 27.5inch barrel. Thanks in advance for any info you're willing/able to share.
With the news that they're not over-choked now, you've piqued my interest in these again. How fast is it pushing those H&N slugs? OEM hammer spring and reg pressure or big hammer spring and upped reg? Plenum? Curious if there's any diminishing returns with that 27.5inch barrel. Thanks in advance for any info you're willing/able to share.
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I installed a power plenum along with the 700mm barrel. That alone gained me 50 fps and more shots. So about 900 fps with the 25 grain. The regulator is oem and I have not touched it. Seems to fall off around 140 bar. The power really came out when I stacked a couple nylon washers behind the hammer spring. It can shoot the redesigned monster 1065 fps. I adjusted it down to 930 fps with the 25 gr H&N slugs for 40 shots on a 250 bar fill.
I chose to use nylon washers because I didn't like what others have said about the power spring.
I chose to use nylon washers because I didn't like what others have said about the power spring.
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Thanks Seth. Making good power!
I always thought the reg in my Long was set around 135 ish but when I finally went that deep, after a couple years of ownership, reg had 125 written on it in red sharpie. I bought it new so it came from Taipan marked that way.
I agree with you about the power spring.
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