"Bullseye" old and new

1917watercooled

Have loaded around a 1000 rounds of 40 S&W 175gr. lead bullet over 4.7gr. of 'old' Bullseye this week, the one that came in a metal type bottle. Bought new Bullseyes today in an all new type platic bottle. Question...is the amount of powder for that loading the same from old to new? Thanks

243winxb

To know for sure ask Alliant here> http://www.alliantpowder.com/questions/default.aspx If my memory is correct, Bullseye was changed to burn cleaner back when it was under the name of Hercules Powder Company. The burning rate did not change. Get a 2nd opinion When you get a reply from Alliant, let us all know the answer. Ty. Company history with photos of containers> http://www.alliantpowder.com/general/about_us.aspx

Rocky Raab

If you use current data for current powder, you should be fine. As always when changing any component, back down and check to see that the substitution delivers expected results.

Follow my "95% Solution" that you can read in its entirety at my webpage http://www.reloadingroom.com/index_files/95S.htm

Here's a summary: Take your existing load of 4.7 grains and reduce it by 5%, or 4.5 grains. Chrono that reduced load with the OLD powder.

Now chrono the same 4.5 with the NEW powder. If the velocity is the same, you can immediately go back to your standard 4.7 load with the new powder.

If the velocity is either higher or lower, make the obvious corrections. The reason you reduce the load by 5% is because the new powder might be hotter, and the reduction keeps the load safe.

CapnMidnight

I've loaded Bullseye for more years than I care to remember. 5grs in my 45 acps and 5grs in my 38 supers. The old metal cans, an old yellow 15lb keg up to the new plastic bottles, not ever noticed any difference.
W.D.

perry shooter

If you look at the loads the top shooters used in Bulls-Eye pistols from the 1950's you will see they used less then we use today. I started shooting in late 1960's and had the use of Ransom rest but no chronograph until about 1974 ant then it was a very primitive Chronograph with screens. that had to be changed between shots . I found with my light weight and body type I had to use 4.2 grains of powder to function the pistol with Gold Cup recoil spring I went to a Closing up shop sale and Found Four PINK/red 8 pound metal cans that store owner said he could never sell and most likely 15 years old or older. They were all same lot number in cardboard .the price was right so I bought all 4 cans When I ran out of the one pound of new er stuff 1970's I opened up one of the meal cans loaded 50 rounds and it felt like Hard Ball . I had to drop back to 3.8 grains to get same group size and FPS. This comes down to My opinion is the 1950's stuff was hotter but after I bought a new state of the art Chronograph in the mid 1980's Bulls eye has mostly only need .1 grain + or - between lot# of 8 pound drums to get same Velocity In Ransom rest. It came down to Velocity of the same bullet was very important to finding the sweet spot in group size. I always tested when changing lot number of powder or primers . I used to order 10,000-15,000 unlubed bullets at a time so all bullets went though my sizing die and from same maker for close to 30 years.