I was shooting my 45-70 T/C Prohunter with the Katadin barrel last week end.
I was having velocity and grouping issues with every powder I tried. It was getting frustrating!
There was always a significant number of powder grains left in the bore after each round fired. Velocities I wanted were being achieved, but accuracy really sucked! I was getting 2-1/2 to 3" 5 shot groups at 100.
My goal was to develop an accurate load with my 418 Grain Lyman flat nosed RN. I was hoping to get around the 1350-1450fps range in order to keep the recoil down in this ultra light package. This velocity would be more than sufficient for most hunting here in Alberta.
My powder choices eventually "lead" me to try IMR SR4759.
My bullet was Lyman lube-sized to .459" with Lyman Super Moly.
Boolet alloy was 18lbs. of wheel weight lead + 8 feet of 50/50 lead tin solder. Cast about 10 years ago.
I tried to seat my boolets firmly into the rifling to help get my ignition pressure higher, and hopefully get the powder to burn cleaner and more consistantly.
At this seating depth I could not get a good solid crimp due to the top bearing band being located right at the case crimp line.
Even with IMR SR4759's faster burn rate, it burnt dirty as heck!
After much frustration, I finally decided to try some Dacron between the powder and bullet base. This technique worked wonders in my 308Win, so I figured it should work here.
I also Seated the bullet to the crimp groove again and crimped it heavily as well.
Right from the first shot I feel and see the difference! I fired the first 5 rounds (24.0 Grains IMR SR4759) and managed to print a 1-3/4" group. With 3 of 5 inside 1-1/4". The bore was as clean as though I patched it!
My Standard deviation was 10.76fps (1330fps velocity). I was pleased with the improvement.
The load at 25.0 Grains of IMR SR4759 shot into 1-1/2" for 5 rounds, giving me an average velocity of 1388fps, and a standard deviation of 8.83fps! wowzers! I know this is only a 5 shot sampling, but it still started to show a positive trend. The bore once again was clean as a whistle!
My final load of 26.0 Grains of IMR SR4759, and it gave me a five shot group of 1.25"!
4 of 5 rounds were within 3/4"! Average velocity was 1431fps, Standard Deviation was 3.16fps, Extream spread was 8.11 fps! Bore was clean again.
At 26.0 grains the velocity was around my ideal goal range, and recoil was just on the upper side of comfortable. Perfect!
Now to go out another couple of times to prove the load!
After confirming the load again, I am very convinced of the merits of Dacron on ballistic uniformity! Printing nice tight groups with a large bore ultralight is a riot!
Here is a picture of the rifle I am working on at this time. It isn't the traditional buffalo style 45-70, but it is a fun compact little package! Hope you like the picture!