Re: 223 varmint loads
There are so many loads that will work well in the 223 with all bullet weights. Probably one of the ones that will work in all guns that I have tried is 27.0-28.0g of 748 with a 50g Bullet of your choice or 26.5g or so of 748 with
a 55g Bullet.
If you are looking for splat factor, then the 50g V max or the blitz king will be the best.
If you are looking for economy, then the 50g TNT will shoot like a berger bullet in a lot of custom guns.
Try to seat the bullet to touch the lands if possible or within 0.010.
Benchmark, 322 and 335 all work extremely well in the 223 also, but 748 is my go to powder in the 223 for sustained shooting on dog towns.
N-133 is the fastest with extreme accuracy,but until they get the distribution set up with Hodgdon, supply is very spotty. I shoot the 50's at 3650 out of a 26" bbl using 26.0g of N-133 with 7 1/2 primers, tiny, tiny groups with IMI brass (work up to this load if you try it).
For a pelt friendly 223 load, 26.5g of 748 with a 55g Winchester is hard to beat and really carries a lot of punch on larger coyotes. I killed thousands of p.dogs with this load, also because it is real easy on barrels.