Switching to non-molly Lapua Scenar, what effect to expect?

[IMtheNRA]

After a bit of experimenting, I developed a .308 load my rifle likes, using a molly coated 167-gr Scenar "silver jacket". Now this bullet is not available in the usual 1,000-count box, so I have the non molly coated Scenars of the same weight on the way.

Do you think my load delvelopment process will have to start again, or should I expect the same performance and group size from this bullet using the previous powder charge and bullet seating data?

 

[waumo]

Clean the barrel well before switching to non-moly bullets.

You should drop down in powder weight and work up a new load.

You will likely need less powder for the same velocity.

You will likely need to clean more often.

 

[Slamfire]

Clean the barrel well before switching to non-moly bullets.

I don't use moly, just because it is another thing that will go wrong. From the moly users I have known, and there are many, this is a true statement. You have got your barrel coated with moly grease and it is hard to remove. For one, his barrel would not shoot the moly bullets, and then he found, it would not now shoot the non moly bullets!

He was a HM, but he may have been the exception.

You will likely need to clean more often.

This is one of these moly myths that get bandied about. I was squadded with one of David Tubb's team members, and they were all cleaning their barrels, using JB bore paste, solvent, and Kroil, each and every night.

 

[30Cal]

I'd just clean it normally then shoot.

 

[Bad Flynch]

Why don't you moly-coat your own bullets? I have been doing that for years.

Otherwise:

Be certain to clean out as much of the moly from your barrel as you can. That will probably include using JB Paste or Corbin's bore cleaner. It really takes quite a bit of cleaning to get it out, BTW. When done cleaning, go through a barrel break-in procedure like you would for a new barrel, before you do new load development work.

 

[BsChoy]

I was under the impressive that the moly lowered pressure and this decreases velocity....thereby requiring more powder for the same velocity

You will likely need less powder for the same velocity

 

[45ACPUSER]

Boy I would be cleaning the barrel very good before switching back to naked bullets. I have held the idea that once you go moly in a bbl you stay with it!
for the life of the bbl. When you change out any component or parameter (moly coating) you work the load up all over again! That is safe reloading practice!

 

[IMtheNRA]

What would happen if I don't clean the barrel? What is the residual effect of moly coating? I've been shooting other bullet types while using these Silver Jacket Lapuas and I have not noticed anything bad...

 

[R.W.Dale]

I was under the impressive that the moly lowered pressure and this decreases velocity....thereby requiring more powder for the same velocity

Quote:
You will likely need less powder for the same velocity

You just answered your own question. non moly will require less powder to = the same pressure velocity This thread is about going from moly to none