Oldsmokeyjeff - I too have a Legendary Frontiersman (L.F.); unfortunately I paid a lot more for mine
. Lone Star has the formula for good cheap brass that has a little "thinner" neck than the original brass. Although it is shorter after fireforming, it works just fine with just about all bullet weights for this caliber. My gun slugs .379 and I've even gotten descent accuracy with "jacketed" bullets as small as .375, although you have to drive them pretty fast to "bump up" to "grove" diameter. Cast bullets IMO are harder to bump up unless the lead is softer, which could cause leading from being undersized (even hard cast cause this problem if "undersized").The gun starts "perkin" when you use a relatively hard cast with a gas check in the "right" size; you can purchase them ready made from several vendors. You might want to start with .379 diameter and work your way up. The Winchester 94 action will take any pressure that the 30-30 will take, ie. max of 42,000PSI, so you can improve on the factory ballistics (1320fps) by at least 500fps. That, my friend, puts it in a whole new category only equaled by much larger bores. I've loaded mine up to 1900fps with a 274GC "home" cast bullet and have gotten "hunting" accuracy with the round. You needn't go to .375 Win velocities to have an effective gun in the 38/55; 25.0 or 26.0gr of RL7 behind a 255gr bullet will get you 1550 to 1600fps, easy recoil, and plenty of energy for those North Carolina bears as long as it is accurate. I'm still working on the best cast load, which is right now 37.0gr of AA2495 behind a "Hunter" 268gr GC. It's clocking 1820fps and groups about 1 1/4" at 50 yards with "iron" sights for 5 rounds. I'm still working on that magic 1" load and will try some Beartooth cast bullets in .380 diameter to see if they tighten up. I've tried to use .381 diameter bullets, but they were to hard to chamber in the L.F. My loads may be too hot in your gun - work up cautiously! My loads are only worth what you had to pay to get them
. Good luck in your pursuit; it is not an easy cartridge to load for, but well worth the effort in a easy handling rifle that is fun to shoot. Jager