Finding the right size slugs for impact m4.25 700mm barrel, best size for. 22 is .217 or .218 but in .25 would be the same?

Trying to find out what size slugs got best results for m4 sniper 700mm. 25cal, there must be a size that shows better results than the regular. 25 ammo ,in .22 everyone knows. 217 or. 218 shows tighter groups and im sure someone have done it and I will love to hear about that also is rare but little bigger also works as .001 bigger, please share your experience and most important your numbers are exquisite in this platform, thank you much everyone shoot tight!
 
the only way to answer your question is to put in the time testing different sized slugs yourself.

what size your barrel likes isnt necessarily going to be the same as what someone elses barrel likes,
every barrel is different.

and FWIW slugs,
for me anyway,
have been a long lonesome dark tunnel,
sometimes youll see a tiny light at the end,
but its usually quickly extinguished lol

best of luck
 
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My 600mm superior heavy barrel on my King does it's best with .250 on the money 🤑 I've tried .249/.251 and both shot acceptable but .250 shines through. There's also the speed factor! Testing testing and more testing! Lol
There's no easy answer just have to find what works best for you and your barrel. At the moment I'm shooting .250 34 grain Varmint knockers XLHP at 980 and it's a freaking laser out to 100.
 
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