marlinguy wrote on Dec 14^th, 2017 at 11:31am:


Having loaded both since teenager, a cannot agree with either position. However, only presently available BP that is "easy" to get good results with is Swiss. With Goex, etc., OneAtAtime's post is a fair description of reality -- only "escape" from that reality is post-reloading partial or complete cleaning of bore after every shot (which is so ingrained that even shooters using Swiss, excellent bullets and lubes do it instead of developing loads that shoot small groups for 10-15 or more shots, no wiping). Some even admit that they are "scared" to NOT wipe, etc.

IF one were to follow High Power national matches, where provided ammo must be used, it soon becomes that at least for common cartridges, eg. 7,62X51 (aka 308 Win), there are some loads that shoot really well in a very wide range of rifles. Ditto for 7mm08, 6,5 X 55 Swedish Mauser, etc.

It's not an issue if you ship your ammo to it's destination, and then travel there with the gun. Friend of mine shoots for Savage in International Long Range matches and that's how the team gets their personally loaded ammo to the events.
But black powder would be a whole different set of problems!

As to cartridge adhesion: take a look at some of the NATO proofing standards.
I was of the opinion that cartridge adhesion didn't count until I saw some data.
Lubrication of the case results in significant, meaning measurable, differences in thrust.
IIRC about 10%. Unfortunately, I didn't find a quote for thrust. 

NATO:
"Each weapon and component considered vulnerable to the effects of a rapid change in pressure, for example barrels, breech blocks and bolts, will be tested by firing one dry round at a corrected minimum of 25% over pressure and one oiled round at a corrected minimum of 25% over pressure. 25% over pressure means 25% in excess of the Service Pressure (P)."

IIRC double based powders are to be highly recommended for light loads as the tend to avoid the pressure spikes that sometimes happen with single based powder. Lots of data on the web. However, because of the energy available with double based powder one needs to keep their wits about them when loading. The idea of keeping the empty cases inverted until charged with powder; then immediately seat the bullet has always made sense to me. AFICT my head is still attached.