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Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Buzzsaw, Oct 26, 2018.
thinking about building one. Anyone shooting/loading one yet
What do you think?
What's holding you back?
What do you want to use it for? Varmints, Targets, Hunting, Plinking?
I think it will be a great round... I already shoot one similar called the .22 middlestead
Obviously, the OP has left the building and we are left holding the bag...
The .22 Creedmoor is a great match for the longer and heavier bullets in .22 caliber. There is a balance between the amount of powder necessary to get these slender arrows out of the barrel and quite a ways down range before they run out of velocity.
75 AMAX = 3500
80 Berger = 3400
95 Sierra = 3250
These are approximate and based on test barrels at 26" without a brake or a suppressor. The pressure and OAL can be optimized with the velocity once you and your gunsmith pare down the bullet selection. Note that the Sierra requires a faster than normal twist rate.
Outrageous velocities are available when using lightweight bullets for varmint shooting. Just match your twist rate to the bullets selected. Expect large diameter clouds of red mist...
I just finished one about 2 months ago. I went with a Pac Nor SSSM barrel at a finished 28" 1:8 twist. The rifle shot good right from the start with 80.5 gr Berger's and 80 gr Nosler CC bullets. I also shot some 75 gr Hornady's and they shot very good as well. But, I had built the rifle specifically for the 80 gr. bullets. My load is at a full 2 grains below max for this rifle and I'm getting Magneto Sporter average of 3450 fps. I've got 130 rounds down the tube and it'll give under .500, 5 shot groups and better. Best I have gotten with it is a 5 shot group of .398. That is perfect, "minute of coyote".
Isnt it basically a 22-250 Ackley?
What is your COAL with the 80 grain bullets?. I'm having one built soon.
I suppose it really depends upon how you nitpick the term 'basically'.
The basic differences between the two cartridges is the shoulder angle and the case capacity. Now add in the operating pressure limits used by the powder manufacturers for load tables and the difference begins to increase.
But in this day and age, there are wordsmiths who thrive on using any little variable to mitigate a real difference. In my opinion, and I stress opinion, even though I've shot the 22-250 AI for 20+ years at least and the 22 Creedmoor for 2 years, the AI lags behind the Creedmoor by a difference of 150 to 200 fps using the same bullet. Since I'm most interested in the effects on prairie dogs and such, that is a significant difference for my intentions.
Jgal72 If I remember correctly it's 2.625. I sent a dummy round in to the gunsmith as I wanted the base of the bullet no more than halfway down the shoulder.
I believe it's 2.625. That puts the bottom of the bullet around the middle of the shoulder.