Is a Blazer not user adjustable? What's the big problem with Palmer's guns? I thought they probably tuned just like an Autococker, which isn't exactly quantum physics...(nobody has to answer this, lol.) 
Anyway, here's my $.02 on barrel sizing:
Every brand of paint I've tried in the last 3 years or more has measured no bigger than .682. This has been important to me because I own and shoot a lot of Autocockers and Snipers. I have not been able to use anything larger than my .682 Freak insert or my .682 Kaner back without getting rollouts. I often get rollouts with my .682's. This is with Marbalizers, various DXS paint, Forumula 13, Cryptic, and many more.
Having said that, I thought it wouldn't matter much if I overbored with my Mag, because it's open bolt; the detent ensures that each ball always starts from the same place regardless of barrel size. (if you overbore with an Autococker you'll get horrible velocity consistancy and rollouts.) For the first few days of playing with my new Mag, I used the same barrel/insert/back I would use on my Cockers. The Mag shot wonderfully, very consistant over the chrono, and quite accurate.
Then last weekend, I wanted to try my Eclipse Shaft .689 barrel on the Mag. I did not have the same results, even though it is a very high quality barrel, and it has shot very well in the past when paint was larger. No, the velocity consistancy was definitely much worse than normal, with jumps of +/- 15fps, and very noticable when shooting at people. My cocker, on the other hand, shot the usual +/-2 or 3 fps using the same paint, but a slight underbore.
To make a long story less long, I'd have to say that a slight underbore is your best bet, on all guns. Or even a slight overbore. .689 is vastly overbored with today's paint.
Anyway, here's my $.02 on barrel sizing:
Every brand of paint I've tried in the last 3 years or more has measured no bigger than .682. This has been important to me because I own and shoot a lot of Autocockers and Snipers. I have not been able to use anything larger than my .682 Freak insert or my .682 Kaner back without getting rollouts. I often get rollouts with my .682's. This is with Marbalizers, various DXS paint, Forumula 13, Cryptic, and many more.
Having said that, I thought it wouldn't matter much if I overbored with my Mag, because it's open bolt; the detent ensures that each ball always starts from the same place regardless of barrel size. (if you overbore with an Autococker you'll get horrible velocity consistancy and rollouts.) For the first few days of playing with my new Mag, I used the same barrel/insert/back I would use on my Cockers. The Mag shot wonderfully, very consistant over the chrono, and quite accurate.
Then last weekend, I wanted to try my Eclipse Shaft .689 barrel on the Mag. I did not have the same results, even though it is a very high quality barrel, and it has shot very well in the past when paint was larger. No, the velocity consistancy was definitely much worse than normal, with jumps of +/- 15fps, and very noticable when shooting at people. My cocker, on the other hand, shot the usual +/-2 or 3 fps using the same paint, but a slight underbore.
To make a long story less long, I'd have to say that a slight underbore is your best bet, on all guns. Or even a slight overbore. .689 is vastly overbored with today's paint.
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