I’m struggling between the 22-250 AI and 22 CM. I don’t know how much difference there really is...
Can't tell you about the Creedmore, never used one. But the 22-250AI since about '90 and wore out a few barrels. I like the cartridge. Best accuracy and vel. in my std. 22-250 is a 50 with 37.5 / RL15 doing 3926. Very good load. Several 22-250AI's all love about 40-41gr. RL15. .Favorite is the 25" Walther....fireforrms at 4113 with 38.5gr./ RL15, with formed brass and 39.9gr it's doing about 4200 - almost 300 fps. more than that std 22-250. ( I'll add that fireforming load is just as accurate as formed and completely usable in the field - I've formed about 6,000 AI cases of different chamberings on chucks and pd's) The 28" Hart is at 4246 with 41.2gr. A 25" Winchester barrel likes 39.8gr for 4079fps is best......40.2gr does 4126 but less acccurate. Chambers are all comparable with no freebore, but my reamer has .255" nk while 2 of these barrels are tight neck. Win. 760 works well in that case but it takes more of it and velocity/accuracy isn't up to RL15. Best powder I've found is Reloder 15, the stuff just works great. Brass is the very tough and no longer available PMC. The 22-250AI has always worked real well for me and I've no reason to start messing with another one. But if you're starting from scratch and 22CM brass is readily available, and the stuff is good, I'd say it's a tossup and go with either.
Great info and sounds like you are moving things out of your shooters at top speed. Great to see.
I have a beloved 22-250 and worked up a load with 30g NXT and RL-7 to get to 4329fps over my chronograph but felt like this was going to wear out that barrel super fast and bagged that load. Favorite 22-250 load is 40g NBT with Varget for a whisper under 3800fps again over chronograph for a shoot all day loading. Shot many many rounds through it and love that 22-250 caliber.
Your experience shows a favorite powder in the RL-15 and I wondered if the newer RL-16 holds any interest for your applications?
I am using it in a AR10 6.5CM with some very good results in velocity and accuracy.
Again its good to see someone who is interest in some fast movers when it comes to reloading for varmint applications. Many times we get a wee bit of shade from those that don't.
