DD,
Several summers ago, I did some testing with b.p. in the .30-30 using 2 different rifles, a Marlin 336 A micro groove (24") and a Winchester '94 (26"). Long story short, as expected, Swiss worked the best with no foul out in the barrel for 20 rounds (most fired at one time.)
>Bullets: 150 gr. Lyman Loverin, 160 gr. LBT, 311291
All were gas checked and lubed with SPG
>Alloy: w.w+2% tin, 50-50 (Lino-WW) The harder 50-50 alloy shot the best.
>Powders: Swiss FFG / Swiss FFFG
>Compression: .05" - .20 settled charge .05" worked the best
>Primer: standard large pistol
After all the testing, the best combination produced groups in both rifles that averaged 2X the size of standard loads in both rifles which I did not think was too bad. The furthest distance tried was on the 300 meter steel Javelina. Once sighted in, hits were pretty consistent from a solid rest. Group size was about 3 MOA.
The 160 LBT produced the best results. Velocity with Swiss FFFG ran a bit over 1,500 f.p.s. with the Loverin a close second.
The heavier 311291 (175 grs.) did not shoot as well possibly because of lower velocity of around 1,400 f.p.s. Heavier bullets produced partial keyholes.
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