Greetings @SixtyTen,
Depending on what you are using the rifle for you may want to try the Hornady 174 grain round nose. These shot well for me in a No4 like yours with a PH sight. I was using much lighter loads of 32 grains of AR2206H in a scoped rifle and 40 grains of AR2209 in the iron sight rifle. This last is well below start loads so caution is needed. 32 grains of AR2206H gave around 2,100 fps in my near new barrel in my scoped rifle using current production 174 grain RN.
Slower loads shooting high is common in some .303 rifles.
Regards Grandpamac.
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