Originally Posted by ludlow22
Yeah, I don't want to push the round any faster, for th at exact reason. Ive seen a lot of swift and 250 barrels shot out due to excessive velocities. But what I need is an ideal twist and length for the most stable flight of these rounds so i can have a barrel made and matched to my 700 action. Thanks
but what i said is based off general rules of thumb and not true in every case. remember that a barrel has a finite lifespan based on number of rounds fired before it loses accuracy. there are many variables that have to be factored in. slow burning vs. fast burning powders, small and lightweight bullets vs. heavier bullets, and ect., ect... even the 220 Swift can lead a much better barrel life now than fifty years ago, due to vast improvements in powder technology today. back when the 220 Swift came on the market, with the large case size, small 22 caliber bullet and the powders needed to push it over 4000 fps, it ended up being a barrel burner, due to it completing a lot of the powder burn in the barrel vs. the case. the 22-250 with the same bullets, smaller more efficient case size and different powders, pushed the bullet almost as fast without the adverse effects of burrning out the barrel, due to completed burn in the case, vs. the barrel.
i am guessing you are barreling an action? if this is the case, then you will have much more options, vs. using a factory built rifle. my suggestion would be to pick a range of bullet weights you want to shoot and then pick a twist ratio based on this. this is what i am doing with mine. most people who do this make the rifle a pretty much singular use rifle. of the shelf rifles come with a twist ratio that will work with a very broad range of bullet weights. my planned rifle is based on a 6.5mm bullet and the twist ration will be optimized for bullets in the 100-120gr weight range. are you fully decided on going 223 caliber or open to suggestions? another suggestion, if you are rebarreling, you really need to consider reloading to get the full potential out of the rifle. not that it can't perform well with premium factory ammo, but will usually perform much better with fine tuned handloads.