Originally Posted By: midwestpredatorOriginally Posted By: steve garrettOriginally Posted By: R JohnsonOriginally Posted By: steve garrettit looks like a 22-6.8 that some guys around here have done, typically using a black hole barrel. plan on about 150 fps extra, when loaded equal pressure to the 223, some will chime in and say its more than that. I disagree it comes down to case compacity and the 4:1 rule. the 6x6.8 has been alot more popular that doing a 22 cal. personally I don't think its enough extra over the 223 case to warrant the extra expense. however in a bolt gun things are different your not shooting the volume and your not puking cases 20 feet when you fire the gun. I would consider the 6x6.8 if it was a little faster and the cases were alot less money.
Garret, You should probably go back to school. Your 4 to 1 rule only works when used with similar cases at similar pressure. It won't work when you compare a larger case to a smaller case. If it works the, 22-250 would only be 200 FPS faster than your beloved 223. You also have never shot any of the 6.8 based cartridges. If you had you would praising the merits of them not spewing misinformation and hiding behind the old "My Opinion" guise.
Another thing, why would you want to load down to 55,000 PSI like you do with your 223? The 6.8 platform and case is rated to run at 58,000. So now why shouldn't it way outrun the 223?
Another good one of your so called opinions is ejecting brass. If your gun is PUKING brass 20 feet you probably should find someone to fix it. Apparently it must be broke and you don't know how or can't repair it.
One thing your right about is someone chiming in. It sounds like your trying to instigate an argument about something you have little or no knowledge of. Maybe its time for you to sit back and read, you might learn something.
did someone pee in your cheerios are you having a bad day?? seriously you come here and attack me when I have said nothing to you, who the [beeep] do you think you are?
first of all the 5.56 nato case is rated at what 62kpsi? There is actually load data albeit hard to find that has 5.56 nato loading data available. I load my 223's or should I say I load my 5.56 nato to higher pressures.
YES an ar 15 can puke brass 20 feet away have you ever shot at a gun range and had to chase brass from under benches and other areas. I thought you were some high class AR builder you of all people aught to have had this happpen, or do you just screw parts together and call it good?? dude you attacked me,
this site shows case compacities,
http://www.chuckhawks.com/rifle_case_capacity.htm it lists the 223 case as holding 31.4 grains, the 22-250 case as holding 44.6. The difference is 13.2 grains. The 22-250 case holds roughly 42% more powder. this means it should drive a bullet roughly 10-11% faster than a 223 when loaded to equal pressure. so if you push a 50 grain bullet from a bolt gun 223 at 3500 fps, this means it should achieve about 3850-3900 fps when fired from a 22-250, as you can see this matches up with about how fast you can push a bullet from a 22-250 as well.
you simply can't escape the rules of case compacity and pressure. ritch you want to come on here and attack me personally without ANY provocation what so ever. I am going to give it right back to you with facts and with numbers. I am entitled to my opinion just like everyone else is. the man came on here and asked a question, no one had replied so I gave him my opinion, isn't that what a forum is used for?
You seem to talk alot about equal pressure this or that. Im curious, how do you know what pressure you are running in your guns? Do you run a strain guage on every barrel? you don't, I just watch this as a reloader just like anyone else would. The 4:1 rule is by no means exact, different barrels shoot faster than others. There are also numerous other factors, its just a general rule of thumb. It doesn't help when cases are rated 2 different ways. the 223 being rated for alot less pressure than a 5.56 nato.
another example is the 280 ackley, the regular 280 is rated at lower pressure than a 280 ackley. yet people think they have a 7mm mag when they load up their 280 ackley to max. It not comparing equal pressures and ratings. your not getting an apples to apples comparison.