I run 350 gr hornady flat nose bullets in my guide gun at just over 2000 fps and if sighted 4" high at 100 it is 4" low at 200 yrds, at 250 it is 12" low and 300 27" low. I have never shot it past 200 yrds but thats what the calculator shows. I shoot it with a 2-7 leupold and would be comfortable shooting something at 200 yrds if I had a good shooting position, 250 would be aim for the top of the shoulder on a deer but lots of room for error and potential for a wounded deer if doing that.
300 grainers at 2400fps would give you 4" +/- trajectory to 240 yrds, the problem with loads like this is they kick like a mule and a short light gun like the marlin gg tends to jump around for me.
The best bet is to buy one and practise with it to see what works for you. You won't regret having one of these in the cabinet.
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