New Savage 111 in .270Win 'Journey' to accuracy

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I was getting sub 1 moa groups with 55gn of H-4350 behind a Sierra 130gn SPBT

The good news is that it looks like you have found a good load for the 130gr Sierra. The Sierra V Manual lists 55.5gr of IMR-4350 @3100fps for that bullet as maximum in the 26" Savage 116 they used for testing. Their "accuracy load" is listed as 56.7gr of Reloader 22 @3000fps and their "hunting load" is 58.2gr RL-22 (MAXIMUM) at 3100fps. I would definitely try some Reloader 22.

As far as the bullet dispersion problem with different loads, you are going to get the usual advise of "check the bases, check the rings, check the stock bolt tension, etc. etc." That is good advice and you should do that. However I really wouldn't worry too much right now about dispersion. You have a new rifle with a new barrel and a new scope. You don't know how reliable the scope is yet so I would shoot the accurate load that you know works and play with the scope first. If the scope proves itself, I would work on developing other loads with different bullet types.

By way of encouragement I would say that the nice triangle shaped three shot groups on a few of your targets are usually and indication that you have a barrel that is going to shoot well, a scope that so far is working correctly and your shooting technique is good.