Re: What grain bullet for a 22-250?
Think I have only chronoed 1 barrel that ran more than any reloading manual claimed for velocity with a given powder charge. That was a Weisman-McMillan barrel in 308. Using AA2495 I could achieved published velocity with 1 grain less than the Accurate manual. Believe it claimed 2708fps with 44gr and I was getting 2740fps with 43gr? Every other factory or aftermarket barrel always was from 20 fps to several hundred less.
My first chronograph experiences were with a friend and his Oehler 35P. His Ruger 22/250 MkII Varmint(the stainless laminated stocked one) would only push a 50gr Reminton bulk @ 3250ish!!! My factory Remington 223 VSSF would run 3300+ with same bullet. Both with 26" barrels. He was not a happy camper to find the velocity of his new 'prized' Ruger 22/250 to be less than a Remington 223 and he hated Remington's for some reason. The 223 part made it that much worse
In fact my Varmint Special 222 was about 3225fps. So just because a book or the manufacturer claims a certain velocity with a given factory load or reload sure doesn't make it 'fact'!!!!!
My brothers cheap Chrony is always faster than the Oehler, sometimes almost 100pfs! It is not a consistent velocity each time so not really a variable you can predict as a general rule. Perhaps the newer ones are more accurate, his is 8ish yrs old.
I shouldn't state my 22/250AI velocity is max for all loadings. The 39gr of IMR4895 is max for my rifle and I have never tried Varget etc. No kidding it will shoot sub moa from the pitted used factory barrel so I can't force myself to try another powder nor junk the tube because of velocity. Best 3 shot group I shot is .158 so call it luck or whatever. As stated above yesterday was a 1 shot 394yd kill. I actually allowed for wind that was present a couple hrs earlier, didn't check when I shot and held for the rear of coyote and that is exactly what I hit.So with my error for wind that wasn't a factor when I dropped the pin and not taking time to change power from 6X and not grabbing my 6XC instead I guess there was some luck in the mix!!!
Always take all the LUCK you can get.LOL