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Nice!

https://www.youtube.com/watch?v=kNVlKRX0JeA

Skip to 4:20 to see the reloads in action if you're interested.

Good luck with the reloads!

Standard Tikka Varmint stainless (forgotten the length) with 2206h - you'll need to lengthen the mag for the 75's to fit but they were great.

Enjoyed the 69 TMK too and they fit the mag.
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Greg does a 22-204 Terminator that fits the bill if you can get a .223 with an 8 twist.

Personally I got the Tikka 1-8 .223 to run the 75 Eldm and 69 SMK at around 3100fps without pressure signs...

Quite enjoyed the 250's I had.

Wasn't a fan of the twist rates but feel thats more to do with the date of the cartrdige.

Seems like there are plenty of newer calibres that offer similar...