5of7 said:
I had a Ruger #1 in .223 re-bored and chambered for the 6.35 x 47, which is the .222 Magnum case necked up to .257 caliber with no other change.
I was able to get 2900 fps with an 87 gr. bullet, but the load proved to be too hot for warm weather, causing loose primers after one loading. I reduced the velocity to 2750 and it is good for any weather and good accuracy with no pressure signs at all.
That was in a 26" bbl though.
Just as a tip on the potential of the .223 case. Bear in mind too, that the .222 Mg has a little more usable capacity than the .223. 8)
So...what do you estimate that 2750FPS which you got would equate to when what we are talking about is a slightly smaller (.223) case and a barrel which is some 6"-10" shorter (depending on which "Mini-14" it's used in), AND after we bleed some of the pressure off in order to operate the Mini's semi-auto action?.....
Me thinks that the answer would be "not a lot"...and we still aint got around to using a heavier bullet for bigger game, which we all know would have to be seated deeper so's the cartridge will fit within the mag. So then there's that...meaning that absent the 250-3000's velocity, about all ya got's is a "one off" .25-Cal rifle that is short of the 7.62X39's "thump" and aint any more effective on small game than the .223/5.56 which you started with.
But hey, I could be wrong.
If someone wants to give it a try, I'm sure that these guys would be glad to help you out:
http://www.accuratemini14.com/index.php
DGW