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I know it has been a while, spring and summer are crazy busy for me, so here is an update. If I attached the image correctly you will see my best result of my first Swiss/427098 test. I was shooting at 100 yards on a warm dry day, front sandbag rest holding rear of rifle. This was the Montanna Bullet works 427098 with 2.18cc of Swiss 1.5F. Two other loads of more powder and two with the RCBS 200gr bullet were larger groups. I did get leading just ahead of the chamber when I shot this load Saturday @ Atglen. With the match, sighting in and playing that was sixty rounds. I did clean the rifle after the first twnty rounds, just to see and feel the fouling. I noticed that when sitting while the other relay was shooting the bore near the muzzle would start to appear "dry". I began using a blow tube before and after each relay without cleaning. The dry/chalky area would moisten very quickly. ( Using the blow tube amused Jack and Gunny , ALOT ) My score was close to what I average in the Pistol Caliber game and it was alot of fun. I will get more bullets and work on fine tuning a load, as I also got a couple pounds of Swiss 2F.
A couple things I noticed. The loads with more powder had heavier thicker fouling. Again, even the most accurate load is leading just ahead of the chamber. The leading I believe is do to bullet fit and alloy. The bullets are .429 and the bore is .429 plus the bullets are Lyman#2 Alloy, not 20-1. Just a little too small and too hard to seal the bore . At least that is my guess.
I will post new results, just don't hold your breath. This is the wrong time of the year for load developement. I will say this though, not matter how busy I am, silhouette matches are on the calender. Like a doctor's appointment they can not be missed.
David
P.S. If you talk to them, give Jack and Gunny my love!!