I recently met a guy that builds his own guns and has created a 22-.243. I'm extremely intrigued by this caliber. I've always like the 22-250 but wished that it would shoot a little heavier bullet at the same speed. I have a .243 and really like it, but this seems to capture the best of both worlds. He loads an 80gr. 22 caliber bullet in a .243 casing necked down. He's shooting this 80gr. sierra at 3400fps... I think it would be a great varmint gun. Any opinions?