Evening
I am surprised you pressure trace results were 1 for 1 velocity to pressure. That differs from my experience, or testing ( article attached) and Norma's work long ago.
If i recall correctly pressure decreased by 5% while velocity decreased by 3%.
excerpt form the article
Performance-wise, moly has a lot of benefits. A lot. The first and most: take two bullets, one coated and one bare, put the same load behind them, then shoot and chronograph. The coated bullet goes slower. How is that a help? The reason it goes slower is because moly drops chamber pressure (into and through the bore easier). And! That velocity loss (at least 50 fps, usually more) is not, proportionately, nearly as much as the accompanying drop in pressure (usually ballpark 4000+ psi). (These figures vary with the cartridge, but all show similar universal influence.) So. The moly-load can be increased beyond previous “maximum” velocity: the idea is to take the coated load up to normal chamber pressure. It works! It’s common to need at the least 1+ grain more propellant to level the coated load with the original bare-bullet load.
One of the upsides is you could run higher speed at the same pressure (with the potential of hitting the next node); down side it take more powder and some situations you don't have more powder room. thinking F /TR and 308 win case capacity.
Accuracy
It is not any more accurate then naked bullets it is the same...not less the same. doing more work for similar results... pass.
Other benefits.
- neck seating molying bullets are bullets which have a coating assisting with neck seating and tensions. instead of dipping case necks in powdered graphite
- alignment it seems to help with bullet alignment during seating and entering the chamber it takes less effort to align with moly vs naked.
- bullet integrity i have seen reports of bullets not getting as grooved to the same extent as naked bullets. this could help in avoiding bullet blow ups and in theory the bullet should be more BC consistent with less metal distortion.
The picture was taken by world class BR shooter recovering 68gn flat based bullets after shooting them into a snow bank. Pictured was grabbed from Benchrest central. bullet on the right is uncoated
here is the link
http://benchrest.com/showthread.php?98382-Nitride-Boron-Bullet-Coatings&highlight=moly
Cleaning less frequently
inconclusive the majority of shooters say that is one of the key points of using moly. I can not confirm; I will clean then shoot several rounds before a match shoot the entire match 200+ rds and then clean. I know several competitors who do the exact same with naked bullets. neither appear to show a drop of in accuracy. I don't shoot for group so i can't confirm if it is detrimental compared to score shooting.
I continue to moly as i believe it provides benefits.
Thanks
Trevor
P.S.
Wet moly method has cut down the amt of time to moly by 75%. dry moly method would usually take 4hrs to coat, using the wet moly method i tumble for 1hr.
i do use the lapua blue case holders and but my bullets in each hole tip down on a piece of paper towel to make sure i get the moly slurry out of the nose.