The old standard for breech seating is to place the bullet in the barrel, with the base 1/16" (approximately) ahead of case mouth. This is a good place to start. Your rifle may perform best with slightly shallower or deeper seating. You want to ensure your bullet base bearing band completely fills groove diameter of your barrel. It's best if your bullet base band is approximately .001" greater than the groove diameter of your barrel.

577Nitro wrote on May 30^th, 2021 at 3:34pm:


Are you talking about breech seating bullets or breachloading?  Two different things.  Your header says "breechloading gap". 

Are you using Grammarly?

Actually it all depends on how much Freebore one's Rifle has to be able establish the correct seating depth and of course having the proper bullet fit. I have found based on my own personal experience that the bullet needs to be engraving completely through the base of the bullet or just shy of.

I would have to say yes. The 28-35 Reamer that borrowed from a very close friend had 220 thousandths of freebore ground into it. That rifle provided me with quite a few competitive honors and if I used the 1/16 ahead of the case rule of thumb it would not have engraved much beyond just the nose itself if that. I personally engraved my bullet of choice just beyond the base and I had extreme success doing just that. I have also done the same with every extremely competitive Schuetzen rifle that I have owned over the past 23 years.

I agree with JLouis. My rifles shoot best with the bullet fully engraved in the rifling. Other rifles may prefer something different.

JerryH

Yes the neck of the case will keep any gases from getting past the case. And it also helps to flair the mouth of the case until you can feel it starting to scrap the sides of the chamber when going in. 
I believe that is what you were asking.

When breech seating if can insert the case behind the seated bullet without spilling any powder you do not need to a use any type of wad nor would I use any of those you mentioned. On the other hand if you cannot get the case into the chamber without spilling powder then use floral foam at the mouth of the case as a wad. You can get it at places like Hobby Lobby or floral supply stores. It comes in blocks and I like the dry over the wet. You then slice it into 1/4 thick slices to be able to use it. How you just push the mouth of the case through the foam. You now have a wad at the mouth of the case and its all ready to use. 
I hope that makes sense.