RN vs Spitzer

My opinion is that any rifle firing your typical hunting round will have,within reason, similar ballistic characteristics and perform as such out to 100 yards with little to no marked differences be it a round nose bullet or one with a point. 

If you are hunting; it's probably better to choose which ammunition will drop the animal quickly with minimum damage to the meat. I think that the accuracy at your hunting ranges would be less important; providing the ammunition will hold a reasonable group from the rifle concerned.

2.100" above center of bore.

Sierra 168grn HPBT  #2200C

sorry, that’s 1.67 MOA.  It’s 1.75 inches high.  

Shamu, I think Gossic was asking about the trajectory of his 7.62 target load, not for hunting.  HT is talking about .303 loads with the 180 pro-hunter soft point for hunting.  

The most accurate one will be which ever one your rifle likes best.
At one hundred yards the only place you might see any different between the two is in the terminal ballistics. Round nose bullets transfer their energy quicker but you probably won’t see that much of a difference in a 31 caliber. But as you noted a spitzer will carry its velocity and therefore energy down range better than a round nose.
The other thing to consider is how much impact velocity the bullets need too reliably perform. The Pro-Hunter is a stouter bullet then the Intr-lock and should be driven faster to provide optimum performance, with impact velocities ideally above 2200 fps or so.

That Sierra 180 gr ProHunter flat base spritzer bullet has never shot well from several of my No. 4 rifles, strings rounds vertical. Perhaps it’s more sensitive to barrel harmonics and you need to find the velocity it likes.  Most of my 10 shot groups at 100 yards were spread vertically about 4 inches, lateral spread was reasonable, 1.5 inches approx IIRC.