IMR 4198 and Hodgedon 4198 continued…
Jan 26, 2021 18:56:17 GMT -5
hillbill, itneverends22, and 4 more like this
Post by Richard on Jan 26, 2021 18:56:17 GMT -5
IMR 4198 and Hodgedon 4198 continued….
As I indicated in another similar thread, I shot both of the above powders side by side for comparison.
My rifle has a 30” Brux 1-18 heavy barrel and uses he Direct Ignition system with Fed. LRMP’s. The lot of IMR powder dates to 2014 and has been kept in a heated/air condition shop up in wood cabinets. The lot of Hodgedon’s was recently purchased and has a 2019 date. I have indicated this as there can be differences in lots. The weather today was around 45* but I shoot from an enclosed, somewhat heated room. I am using a LabRadar for my chronograph. Below, is my work sheet for today’s 39 shots put down range. If you look at group #’s 6 and 7, you will see the comparisons. I would have fired five shots, but my readings were so low and consistent, that I felt three shots was sufficient to show the large difference………..That is: Hodgedon produced 67 more fps than IMR. Both powders were consistent: Hodgedon at 2925 fps with a 9 fps ES and IMR at 2858 fps with a 13 fps ES. Hodgedon produced a .556” three shot group while IMR’s three shot group was just slightly larger at .825”. Again, different lots of powders might give different results but…………….I have always found that Hodgedon powders gave faster speeds than IMR powders of the same number.
I have also been having decent results with a duplex of 10/69--- N-110/H-4198. I shot it at 100 yards #3 (300 XTP) and again at 300 #9 (300 AeroMax). Velocities were almost identical and ES’s quite low.
Another interesting note was shooting 69 gr. of IMR-4227 vs. 70 gr. ( #’4 and 5). At 69 gr. my velocity was 2895 fps with a 21 fps ES; with ONE more grain at 70, it was 2984 fps with a 19 fps ES. My point here is the severe increase in velocity with just one grain increase. Normally with slower powders, a grain might only increase the velocity by 20 fps or so? Not here! That’s 89 fps faster.
So there you have it!
As I indicated in another similar thread, I shot both of the above powders side by side for comparison.
My rifle has a 30” Brux 1-18 heavy barrel and uses he Direct Ignition system with Fed. LRMP’s. The lot of IMR powder dates to 2014 and has been kept in a heated/air condition shop up in wood cabinets. The lot of Hodgedon’s was recently purchased and has a 2019 date. I have indicated this as there can be differences in lots. The weather today was around 45* but I shoot from an enclosed, somewhat heated room. I am using a LabRadar for my chronograph. Below, is my work sheet for today’s 39 shots put down range. If you look at group #’s 6 and 7, you will see the comparisons. I would have fired five shots, but my readings were so low and consistent, that I felt three shots was sufficient to show the large difference………..That is: Hodgedon produced 67 more fps than IMR. Both powders were consistent: Hodgedon at 2925 fps with a 9 fps ES and IMR at 2858 fps with a 13 fps ES. Hodgedon produced a .556” three shot group while IMR’s three shot group was just slightly larger at .825”. Again, different lots of powders might give different results but…………….I have always found that Hodgedon powders gave faster speeds than IMR powders of the same number.
I have also been having decent results with a duplex of 10/69--- N-110/H-4198. I shot it at 100 yards #3 (300 XTP) and again at 300 #9 (300 AeroMax). Velocities were almost identical and ES’s quite low.
Another interesting note was shooting 69 gr. of IMR-4227 vs. 70 gr. ( #’4 and 5). At 69 gr. my velocity was 2895 fps with a 21 fps ES; with ONE more grain at 70, it was 2984 fps with a 19 fps ES. My point here is the severe increase in velocity with just one grain increase. Normally with slower powders, a grain might only increase the velocity by 20 fps or so? Not here! That’s 89 fps faster.
So there you have it!
