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a new build i am doing is for the .30cal 110vmax and 125 nosler, been told that 1-15 twist is best , but is there a compromise twist to allow 155 lapua or 168 amax, for 1000y target or am i just asking to much!
They list the recommended minimum twist rate for their full bullet line, for example:
30 cal:
110 gr match 1-19" 125 Gr Match 1-19" 155.5 Full Bore 1-14" 168 Gr VLD 1-13" 175 Gr VLD 1-13" So with Berger your compromise twist would be 1-13" if you wish to shoot up to the 175 gr VLD or LRBT bullets.
I'm not sure about the A-Max's, but Berger's guide should serve you well.
You could also use this to manually calculate stability with the JBM provided Miller stability formula, found here: