The short answer is more than likely it will work. see below for the long answer
My Winchester product manual says that the recommended load for your combination is 45.2 gns of 748 the fine print says "DO NOT REDUCE CHARGE WEIGHT MORE THAN 10% OR CHANGE COMPONENTS" reducing this load 10% would result in a charge weight of 40.7 gns.
Since you are using military cases, the conventional wisdom is to reduce charge weight between 5 and 10 % your load (44 ) gns represents 97% of the load listed 3% isn't much of a margin. I don't reload 7.62X51 but I think I would be down around 43 gns (95% of the listed load) to start. But since you are not able to function test the ammo there are no guarantees.
The 1919 was designed to function under adverse conditions hot, dirty, etc. and since it is recoil operated it is not sensitive to gas port pressure like a M1, or its younger brother M1A. I would suspect that the design allowed for some reduction in recoil and still being able to function reliably.
None of this speaks to the host of variables, condition of weapon, lubrication, hand loading technique, on and on.
I only had one question,. Why small base dies?