Ken, you say the bore is close to 4.53mm, that's .1785 in my numbers. Which means it's over .177. I miked a bunch of each pellet I have and here's the result:
Crossman Premier Dome, 10.4, .180"
Beeman Silver Ace Dome, 8.0, .180"
RWS Match, 8.4, .185"
RWS Super Point, 8.2, .185"
In powder pistols, lead bullets perform best at bore size or at most .001" over. I can't comment on powder rifles as I haven't worked on them in about 40 years and I don't remember much about this subject relative to them.
I certainly agree with you about under bore size pellets losing air and thus velocity, but relative to the Crossman Premiers, I'd think .180 would be enough over bore to obturate the grooves sufficiently. However, you're much more knowledgeable than I in air guns and I gladly defer to your opinion. It seems these little pellets have rules of their own, and I'm learning them slowly but surely. So, I'll probably be using those Premiers just to plink while breaking in the new rifle but will use either the RWS match or get some RWS domes for serious work.
I don't know what I'll use those Super Points for, since I've read some reports on bad results from that design.
Thanks again for your advice.
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