The Jerome model is captured in the econometric models component of the combined PollyVote. It currently forecasts a two-party vote share of 45.3% for Clinton and 54.7% for Trump in Montana.
Putting the results in context
As a general rule, however, don't have too much faith in the results of single econometric models, as they sometimes incorporate large errors. Instead of relying on results from single econometric models, the best practice scientific advice is to use combined econometric models or, even better, a combined forecast that includes different methods and data.
Comparison to other econometric models
Looking at an average of Montana econometric models, Trump's current two-party vote share is at 57.3%. In comparison to his numbers in the Jerome model Trump's econometric model average is 2.6 percentage points better.
Comparison to the combined PollyVote
PollyVote currently predicts Trump to gain 57.1% of the two-party vote in Montana, which is 2.4 percentage points above the results of the Jerome model. In comparison, a look at the PollyVote national prediction for Trump shows that the actual results are 7.5 percentage points higher.