New toy day one

[Rocketeer77]

We built a 22-250 AI from a Sako 75 base. New 1-8" twist 26" barrel original stock glass bedded, ceracote on all steel work. Started fire-forming brass from Hornady 55gr Varmint express. They're doing 3,500 fps out of original OEM loads with an ES of 100 fps but that said groups under 1/2 MOA at 100 metres as-is.

 

[Sealesniper]

You will be able to get 500-700 more FPS before over pressure or bullet fragmentation.

My 22-250 AI with 1:7 is amazing. I was getting well over 4215 FPS with 40 grain Sierra's but 1 out of 3 would blow apart from the centrifugal force of the spin. At 4200 FPS and a 1:7 twist, simple math comes to 432,000 RPM. I went with a 50 grain bullet and slowed it down to 4009 fps and it is a laser and one hole at 100 yards.

You are going to love shooting this round.

 

[memtb]

Sweet……should be a great little rifle! memtb

 

[Muddyboots]

Perfect rifle for OP's name!

 

[Rocketeer77]

You will be able to get 500-700 more FPS before over pressure or bullet fragmentation.

My 22-250 AI with 1:7 is amazing. I was getting well over 4215 FPS with 40 grain Sierra's but 1 out of 3 would blow apart from the centrifugal force of the spin. At 4200 FPS and a 1:7 twist, simple math comes to 432,000 RPM. I went with a 50 grain bullet and slowed it down to 4009 fps and it is a laser and one hole at 100 yards.

You are going to love shooting this round.

Hopefully the 1-8 twist keeps things under control will try some 73gr ELD-M once we have a few cases to hand.

 

[WILL JONES]

Intrigued...

 

[crkckr]

Regarding the 40 grain Sierra bullets, I don't believe it is the centrifugal force that tears them up and explodes them at around 80 yards, but the heat of flight melting the tips. I have a .22 CHeetah and have the same problem with those sweet little 40 grainers, however some of my targets have shown little gray comets on the paper where the bullet is slinging lead out. Some at 100 yards and some at 25 yards while sighting in a scope. I've had the same thing happen with a 22-250. The solution it to slow the bullet to below 4000fps or try the Sierra 40 gr hollow point. If you're using the Hornet bullet (Sierra #1200) they aren't supposed to be pushed beyond 2600 fps! While most will hit a target, about 10% of them will turn into a puff of gray dust somewhere along the line! So Actually, the CHeetah will do this with any exposed lead bullet up to 55 grains. I'll add a picture of some Hornady 55 gr. SXSP shot at 100 yards.
Cheers,
crkckr

 

[HRM Johnny]

Congratulations on the new rifle. Have you considered copper solids?

 

[Rocketeer77]

Congratulations on the new rifle. Have you considered copper solids?

Something to try out, probably like you guys with scarcity of reloading components