I was looking at the data in Reloading section about this cartridge as it sounded like the same cartridge a buddy of mine had (22PDC)
4200fps with a 52 gr and 5200 with 30gr Bergers!!!
This sounds like an incredible round. Has anyone had experience with this? I searched the whol;e forumn and did not find.

Saeed, what length and twist was this gun? How did the bullets keep from coming apart? Is this gun an absolute barrel burner when loaded in the 4200-5000 fps realm? Thanks

Do you mean the 22-243 Middlestead? If so, I have one, built on a Rem 788. 27" barrel, 1-14 twist. It works well, is no more of a barrel burner than the Swift. If I had to do it again, I would probably specify a quick twist or gain twist barrel, for a little more versatility with heavier bullets. This one sure makes mush out of gophers, though. - Dan

Thank you for your reply. What bullets have you been using or had the most success with? Have you chronoed them? These velocities are just amazing....I don't see how the bullet stays together.

I have not used the 22/243 Middlestead, but am currently using a .224 Clark, which is the 257 Roberts improved case necked down to 224.

The capacity of the 224 Clark is about 64 grains of water, and the 22/243 is somewhat less, at a guess around 55 grains.

My preference would be to use a 1 in 8 twist barrel so that you can shoot bullets of about 75 to 80 grains in weight, which will be better in the wind and shoot flatter past 300 yards.

My chronograph results show that the .224 Clark moves the 55 grain to 4250fps, the 60 grain to 4000fps, the 69 grain to 3900fps, the 75 grain to 3800 fps, and the 80 grain to 3700fps.

55 gr Noslers work great. I've chrono'ed them up to 4200 fps, the most accurate load puts them out at just over 4000 fps. The Clark has a slightly greater case capacity, as does the 22-6mm Rem Ackley Improved, which a friend of mine shoots. Very quick rifles. I'm not sure you would see much differance between them all in the real world, but the chronograph tells the tale, I guess. - Dan

The middlestead is an excellent round. I've got one also, if your serious, try bullets 69-80 with around a 1 in 8 twist. They will make good use of the powder capacity. Its an easy conversion from 243win brass.
I really like the looks of those 80 grain Berger vld's!

I have a Clark too with a 1 in 9 twist and it moves those 80gr bts at 3700 fps also I have a 30 inch barrel on mine in a sako action sure makes short work on wolves and coyotes. My friend has the middlestead and he is not lacking in killing power eather bouth are good rounds Have a good weekend: Coyote Slayer