Lyman 457191

[Sgt H]

Recently purchased a used Lyman 457191 to have a lighter bullet to reduce recoil in my 45/70's and to use for Cowboy side matches out to 200 yards provided it proves to have adequate accuracy. I believe the mold is an older one as it is in small blocks and has no bevel base. Casts at .459" on the base band and the others are .4575" and right at 300gr in 20/1. Loaded a few with 13 and 14 gr Unique and 20gr 2400 to test. 100 yard accuracy with the Unique loads was about 4-5", not good. The 2400 load showed more promise with 3 into and inch and with 2 others opening the group to just over 3 inches. Loved the lack of recoil with these loads compared to the 457193's at 1350fps I have been using for the lever gun side matches. Need more work to try and improve the accuracy.

[Nobade]

I have one of those as well. Pretty much the same results. It's designed for slow twist 45-90 leverguns loaded with black powder and works great there. But to get it to shoot in 45-70 rifles using smokeless powder I eventually ended up sizing them down to .452" and paper patching back up to .460". Then they shot extremely well, at least to 300M.

[skeettx]

I use 4198 for a softer push

[rockrat]

Try casting some with wheelweights and see if that brings the diameter up to maybe .460" or so. Might help

[sukivel]

I use 4198 for a softer push

Me too!


Sent from my iPhone using Tapatalk

[Bent Ramrod]

I’ve never found those stubby 300-330gr .45 boolits good for much more than plinking accuracy and minute-of-deer at 100 yds. This was in a couple of .45-70s with the 22” rifling twists.

They work great for fire-lapping frosty bores, though.

[Sgt H]

Never had much luck with 4198 or similar burn rate powders in low pressure/velocity loads. 4198 or pretty much any single base powder does not burn very efficiently until the pressure gets up to the 25-30,000 psi range, 2000+ fps with a 300gr bullet. I did get fairly decent accuracy with 4198 or similar powders at 50-100 yards with low pressure loads but velocity ES was typically over 100fps. At typical BP 45/70 velocities that much ES equates to 2moa of vertical dispersion at 200 yards, close to 4moa at 300 and gets worse at even longer ranges. Burned quite a bit of 4198 in 45/70 loads in my younger days when I thought driving 300JHP's as fast as possible was a good idea. Long since outgrown such foolishness.