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I have a CZ 527 Varmint with a 1:9 twist and it shoots shoots 40 grain Nosler Ballistic Tip bullets as well as the 52 grain bullets so the 1:9 will handle bullets down to 40 very accurately.
N133 powder 40 gr Nosler BT average of .299 for 15 groups with a best load of average of 0.257.
N133 powder 52 gr Sierra SMK # 1410 average of 0.383 for 79 groups with a best load average of 0.201.
I just started shooting N133 powder and it tops my list of performance powders with the lighter bullets in this .223.
H335 powder 40 gr Nosler BT average of 0.404 for 82 groups with a best load average of 0.317.
H335 powder 52 gr Sierra SMK # 1410 average of 0.421 for 62 groups with a best load average of 0.314.
H335 powder 52 gr Berger # 22408 average of 0.441 for 21 groups with a best load average of 0.206.
H335 was my mainstay powder for bullets under 55 grains until I found some N133 Vihta Vuori powder.
The CZ 527 doesn't do badly with heavier grain bullets either.
H4895 powder 55 gr Berger #22410 average 0.467 for 176 groups with a best load average of 0.399.
H4895 powder 63 grain Sierra # 1370 average of 0.483 for 60 groups with a best load average of 0.358.
H4895 powder 69 gr Sierra # 1380 average of 0.499 for 27 groups with a best load average of 0.378.
It even averaged 0.672 for 75 grain Hornady Boat Tail bullets with R-15 powder. I haven't tried different powders or Sierra, Nosler, or Berger bullets with the 75s so I can't really tell if it would 75s shoot those better than that one test with Hornady 75s.
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