The choke is right around .216 and I have used NOE bullet sizers to make my own slug sizes. I used the 17 gr NSA slugs and they were doing well at or around .216. When I left them unsized at .217 they were slow and inaccurate.
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Nielson Ammo sells sample packs, great idea! Highly recommended to buy some sampler packs, shoot them and see which ones shoot the best.Nick from Nielsen Ammo sent me an email and said he believes. 216 is the correct diameter for the .22 Taipan Vet. I ordered 300 of the 17.5g slugs to try out. I'll give an update after a get to play some.
Also ordered 2 boxes .217" in 17.5 and 20g for the Maverick. 50 bucks down the rabbit hole .
What Nick told you matches my experiences exactly. The 24.8 grain were moderately accurate in both .216" and .2165" but the larger diameters were not. I think the choked barrels are to blame.
I'll say it again...try the FX Hybrid slugs in the Veteran Taipan. In mine they are extremely accurate out to the 100 meters that I've shot them and they shoot dimes all day at 50 meters. They also don't require big power which the Vet Taipan isn't designed for anyway.
My theory is that the mostly hollow Hybrid's allow them to conform more easily in choked barrels. Whatever the case is the Hybrid's are literally the most accurate projectile I've ever shot from the 700mm CZ barrel on my Taipan.