I had several 221s, then discovered the use of Blue Dot powder in the 223 for ground squirrels:
40g V max with 12.0g of Blue Dot is 3000 fps
40g V max with 14.3 is a safe working max load at 3200 fps in my rifle
Much less cleaning involved with Blue dot, in fact every 600 rounds or so. A friend went 900 rounds on his barrel in between cleanings.
Brass for the 221 is a horrible mess to get involved with, especially if you have a good custom reamer.
I ditched the 221 Fire balls and several of the 22 K Hornets also after being so successful in the field with the blue dot loads.
A lot of shooters miss out on loads like these. Since the 80's, I've used powders like Unique, Blue Dot, 2400, Lil'Gun, etc to make lighter bullet loads in 222's and 223's that easily duplicate or exceed their lesser volume cousins and run a little cooler for high volume shooting. My old Lyman Cast Bullet Manual gave a lot of good starting data to play with.
Not only can one easily duplicate the smaller 22 cals using pistol powders, but it is easy to do the same with larger bores like the 30's and larger.
Edit) I'll add that using a 223 in a faster twist like a 1/9" allows one to use not only the light weights at higher speeds, but also allows the use the higher BC bullets like 69 or 75's for better long range action on those winder days. My 26" tubes with 1/9 twist have no problem stabilizing Hornady's 75BTHP and the old AMAX.
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