You're correct that you won't gain a lot of capacity, but you will gain some extra space. Enough for at least an extra .5 grain of powder, which in a 223 is often 25% more than the entire recommended charge range from min to max. Also, some powders deal better with compression than others.
I've not used Varget in the 223, when I got the rifle it was unobtainium, and now the price means it can stay on the shelf as long as I can get Vihtavuori.
With N140, light compression in the form of a very slight "crunch" as the bullet seats isn't a deal breaker in my experience. Any more than that, and I've had problems.
I can eliminate the "crunch" completely with a drop tube, and still have a case that's nearly full of powder, which is ideal.
A barrel with a long throat and bullets seated long to suit that situation help also. A SAAMI-spec chamber is fairly restrictive compared to a chamber cut with a reamer designed for long- for-calibre bullets like the 90 Match Kings or 85.5 Bergers.
I've not used Varget in the 223, when I got the rifle it was unobtainium, and now the price means it can stay on the shelf as long as I can get Vihtavuori.
With N140, light compression in the form of a very slight "crunch" as the bullet seats isn't a deal breaker in my experience. Any more than that, and I've had problems.
I can eliminate the "crunch" completely with a drop tube, and still have a case that's nearly full of powder, which is ideal.
A barrel with a long throat and bullets seated long to suit that situation help also. A SAAMI-spec chamber is fairly restrictive compared to a chamber cut with a reamer designed for long- for-calibre bullets like the 90 Match Kings or 85.5 Bergers.