.243 or .223: Optimun Twist Rate

[andytoshif]

I'm looking for a good yote gun and will probably buy next spring. I've got a couple of different models (Winchester 70 Varmint in ss is really nice looking) I'm heavily considering, and I've pretty much decided on .243.

Question is: what is the appropriate twist rate I should be looking for in a varmint-oriented .243? What about .223?

[Big10gauge]

From Shilen

.224 CF
- 8" for bullets heavier than 70gr.
- 8"* Ratchet rifled 4 groove
- 9" for bullets up to 70gr.
- 12: for bullets up to 63gr.
- 14" for bullets up to 55gr.
- 14"* Ratchet rifled 4 groove
- 15"* for bullets up to 55gr. driven 4,100 pfs or more
- 16:* for bullets up to 55gr. driven 4,300 fps or more
 
6mm/.243
- 8" Special for VLD bullets over 100 gr.
- 8"* Ratchet rifled 4 groove
- 10" For bullets up to 120 gr. and VLD under 100 gr.
- 12" for bullets up to 85gr.
- 13"* for bullets up to 75gr.
- 14"* for bullets up to 70gr.
- 14"* Ratchet rifled 4 groove
- 15"* Special for bullets up to 70gr.
 

[andytoshif]

Thankee