Moly bullets question

[Jim22]

I mistakenly ordered a couple 50 round boxes of 69 gr. .223 match ammunition from Black Hills. I usually only use plain bullets. I have heard about moly leaving a coating in the bore. I have two questions:

1. Will 100 rounds of these leave a coating that will affect the use of non-moly bullets?

2. Anyone have any idea if they'll shoot to the same impact?

 

[noload]

I saw no ill effects from switching back and forth (moly and bare). I would not mix the two in a match. The barrel will recover with a good cleaning. This is what I have found to be true in a 6br.

 

[Jose_Luis_G]

You should better use one of them, up to your opinión and wishes.
By mixing, the only thing you can find is the different result, taking into account that the first shots with one of them shall perform as the previous ones.
I mean that in the interval of the fouling change, the barrel will perform as if it were still shooting the former bullets, and only after some shots, will come the real results with the last ones.
All in all, nothing that cannot be avoided by a deep cleaning before the change.
I'd rather prefer the moly's since they reduce and flatten the rifling and pitting faults.

 

[Immike]

I recently conducted this experiment during a match. My rifle was load tuned to the moly and was shooting excellent. This was with 10 shots of moly followed by 10 shots bare bullets. The rifle shot 100-9x for the first half of the string and dropped 7 points in the 2nd half. With the pressure differences it was enough to take it completely out of tune.

So, this all gravitates to that you have to develop a load for each. And I have done this and it works.