Test stage #1 Lotak lube VS PC

This is the result of the first very simple test I promised some time back.  Lord willing not the last.   This was a very simple test done with a load chosen at random of 13gn Unique powder and a new to me Modern Bond bullet design for a 30 caliber 187gn spitzer gas checked bullet.   I had never used this bullet until today for this test.
The rifle I chose is a very dependably accurate 308 Win built on one of the older Stevens model 200 actions (Savage 110)

I fired each group using the same five Winchester 308 cases neck sized using a Lee collet die and all in about a 30 minute period so conditions were all pretty much the same with a heavy gusting tail wind.

All bullets were from the same batch sized to .310". All were quenched hardened to BHN-24.  I will here note that in a discussion with another like minded shooter  I questioned if he thought that the PC application at 400*F for 10 minutes might alter the initial heat treating.  He responded that he had not considered it but would look into it. He later told me that in his testing that he felt the PC process was reducing the initial heat treated BHN by 3 to 4 BHN points.   If that is the case then the target in this test using conventional lube bullets the bullets will have been harder than the PC bullets.

In the future and as always Lord willing I hope to develop a  loads for each type of bullet used here to see just where that will lead.  Its really the only fair way to determine of one lube method will show any advantage over another not just in accuracy but also in achievable velocity with acceptable accuracy.
The three types used in this test were,   ---   top left  conventional lube with Lotak,  --- top right  Lotak and PC combined,  --- bottom is PC only.    All three typed used Gator checks.
I was going to try a fourth type with PC only and no gas check but that didnt seem to me that it would be a fair test because the Lotak lubed bullets used gas checks so I feel to be fair all should.
Shooting was done at 100 yards.    All bullets were sized to .310" diameter.   The PC bullets before sizing measured .002" larger in diameter than the as cast bullets so would indicate a .001" depth of PC coating.
I think that because of the vastly different coefficient of friction between the three lube types used here it really warrants and individual load development to better evaluate just what can be done with each.  I would like to note that there is a very noticeable difference in the effort required to push bullets through the sizer die with the PC bullets pushing through with noticeably less  effort.

I really hope I can take/find the time to fully explore the possibilities in this if for nothing more that to kill my own cat, so to speak.  It is a subject that I have been quite curious about for a long time no.   What I hope I will find is that by combining both conventional lube and PC the velocity bar may be raised for both.   I am not really discouraged by the not so great target produced by the combined lube types because as I said I believe with load development for each type the end result may be quite surprising.   It may just be that the combined lube type is so slick that chamber pressures are reduced with the same powder charge that produced good results with conventional lube.  That would certainle indicate that as the lube gets slicker reducing the coefficient of friction that the load needs to be adjusted to bring the chamber pressure back in line with the conventional lubed bullets.

I dont know any of this for sure but in my mind going on experience that is what I am leaning toward in my belief.   There is only one way to be sure and if that is to happen through me it depends on the Good Lord allowing me time enough to do so.   With current  daily responsibilities it seems he will have to figure a way to not limit days to 24 hours.  That is the only way I see it possible!