T/C will be .224 with a 1:12" twist. Should stabilize 50 grain bullets. A 10" barrel may not get enough velocity to stabilize them, but I only know 1 way to find out. Load some up and shoot them. Also, you can shoot the .223 bullets in your barrel, but accuracy will not necessarily be phenominal, again the only way to know is to shoot a few and find out.
My 10 inch hornet loves 55 gr. fmj bullets I get about 1 inch at 100 y (I cant shoot much better then this)
My load is 22 hornet remington cases 55 gr fmj bullets 2.2 gr of red dot I don't remember where i got this load from but it works well out of my barrel
my barrel has a bushnell 2.5x phantom rail mount scope and mount. it is nothing fancy but shoots great and a cheep.
I have been shooting 45 gr. Hornet bullets from Hornady (.224 dia.) over IMR 4227. This combo will meet your accuracy requirements out of my barrel. I just purchased some 35 gr. V-Max Hornet bullets (.224 dia.) and am gong to try them over some Win 296 just to see what kind of accuracy I get.
I have a bull barrel, but I would think that either would shoot okay although I have never tried the octagon.
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