Correct on the twist if it is a Marlin 1894...If it is a Micro-Groove, it will be 1 in 38", and will not be the best at stabilizing bullets over 265 grain...300 grain will shoot, but the accuracy is usually not as good as the lighter bullets...They also want at least a .430" diameter bullet for best results...Cast will shoot fine, but need to be hard, and .431" cast shoot best in mine...
If not a Marlin, check the manufacturer for the twist rate, and adjust accordingly...Also, slug your barrel and find out what it wants...
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