Fiftydriver
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If you want a repeater, I would look to find a Rem 700 in 221 FB which are not all that easy to find but they are out there. Not sure they are even making them anymore. It may be easier to find a 17 Fireball in a factory Rem 700 to be honest. Same case so it would feed perfectly well with no receiver mods needed.
A 223 receiver will have issues as far as feeding the very short FB out of the mag box so if this is a consideration wanting a repeating rifle, you may be smart to look for one of the receivers set up for the shorter rounds. The length of the receiver is the same but the mag box and feed lips are set up for the short round which is what you need for good feeding.
Another round you may consider would be the 6mm Fireball. This is a wildcat that you do not hear alot about. Some say its to small for the 6mm bullets but if you load her with the 55-58 gr tipped bullets, it works very well and will give you 75 to 100 fps over the 221 FB with same bullet weights and even better barrel life which would reach the **** near endless catagory as the standard 221 FB has an EXTREMELY long barrel life.
The larger bore would do a couple things for you. More velocity at same pressure as already mentioned but the larger diameter bore also drops muzzle pressure. This lowers the report of the rifle. Anytime you increase the bore size you lower the tone of the report so the sharp crack will be reduced in intensity to more of a boom. Not dramatic difference but others in the area will notice it much more then you would behind the rifle.
Add to that the terminal effect. A 22 cal, 55 gr bullet at 2800-2900 fps compared to a 6mm, 55 gr bullet at 2900-3000 fps, the 6mm will produce much more dramatic "POPS" on small critters because of the larger frontal area of the 6mm bullet.
No fireforming would be needed, just run through the proper die to expand the neck and load with full pressure loads.
You may not be looking to get out of the 22 cal family which is kind of what I am hearing from you but it would be a most interesting option to boost the performance of the little round a bit.
A 223 receiver will have issues as far as feeding the very short FB out of the mag box so if this is a consideration wanting a repeating rifle, you may be smart to look for one of the receivers set up for the shorter rounds. The length of the receiver is the same but the mag box and feed lips are set up for the short round which is what you need for good feeding.
Another round you may consider would be the 6mm Fireball. This is a wildcat that you do not hear alot about. Some say its to small for the 6mm bullets but if you load her with the 55-58 gr tipped bullets, it works very well and will give you 75 to 100 fps over the 221 FB with same bullet weights and even better barrel life which would reach the **** near endless catagory as the standard 221 FB has an EXTREMELY long barrel life.
The larger bore would do a couple things for you. More velocity at same pressure as already mentioned but the larger diameter bore also drops muzzle pressure. This lowers the report of the rifle. Anytime you increase the bore size you lower the tone of the report so the sharp crack will be reduced in intensity to more of a boom. Not dramatic difference but others in the area will notice it much more then you would behind the rifle.
Add to that the terminal effect. A 22 cal, 55 gr bullet at 2800-2900 fps compared to a 6mm, 55 gr bullet at 2900-3000 fps, the 6mm will produce much more dramatic "POPS" on small critters because of the larger frontal area of the 6mm bullet.
No fireforming would be needed, just run through the proper die to expand the neck and load with full pressure loads.
You may not be looking to get out of the 22 cal family which is kind of what I am hearing from you but it would be a most interesting option to boost the performance of the little round a bit.