Shooting the 52 @ the Farm
Dec 27, 2010 21:29:02 GMT -5
Post by sabotloader on Dec 27, 2010 21:29:02 GMT -5
Well, today it was not raining, snowing, or blowing so I headed to the farm with the 52 DISC Extreme. I was going to shoot the 50cal MHC but really wanted to test something that Tom and I have discussed on the land line.
When Tom was here a couple of months ago he left me some Lehigh .458/220 grain bullets. Tom has been really high on their accuracy and I wanted to shoot some of them just to check them for my reference. Plus I think they would make an excellent deer bullet and possibly make the 52 cal a bit more versitile.
I loaded up the chrono also as I wanted to do some comparison information with T7 and BH209. From the shooting comparison that I had done in the past with a 200 grain XTP, BH is not as effecient with that weight bullet as you might think. Tom and I also discussed this on the phone - he is going to do some additional testing at a lower elevation than I am.
It is my feeling especially in the 52 the weight of the bullet is a real factor in getting it to gain velocity from the barrel. It just gets out of the barrel to quickly. Now add the size of the 52 bore and the diameter of the base of the 52 sabot - I feel that this might also effect flight time through the bore. Because of the diameter of the sabot base and the volume capacity of the bore - it offers a greater surface area for the pressure to push on which helps get it out quicker.
I was a bit surprised when I ran into the old 'Law of Deminishing Returns' with T7 so quickly. If you look at the velocities from 100 to 120 grains you can see that I constantly gained a percentage of velocity as I climbed the ladder, but at 130 grains it fell flat... literally shooting powder out the barrel.
When I switched over to BH and ran about the same testing I was a little surprised how the velocity dropped, but again realizing that BH is a 'progressive' burning powder - it just can not build the pressure before that light weight bullet is out the barrel, until I reached 130 grains, even them I doubt that I was burning the entire load.
I also believe I could run this same experiment with a 50 cal bore and come up with higher velocities from each of the powder loads.
Here is a picture of the target with the information embedded on the target.
Using 2100 fps as the velocity - the bullet will develope about 2150 #'s of energy and at 100 yards 1450#'s and at 200 yards it is about 1000#'s.
When Tom was here a couple of months ago he left me some Lehigh .458/220 grain bullets. Tom has been really high on their accuracy and I wanted to shoot some of them just to check them for my reference. Plus I think they would make an excellent deer bullet and possibly make the 52 cal a bit more versitile.
I loaded up the chrono also as I wanted to do some comparison information with T7 and BH209. From the shooting comparison that I had done in the past with a 200 grain XTP, BH is not as effecient with that weight bullet as you might think. Tom and I also discussed this on the phone - he is going to do some additional testing at a lower elevation than I am.
It is my feeling especially in the 52 the weight of the bullet is a real factor in getting it to gain velocity from the barrel. It just gets out of the barrel to quickly. Now add the size of the 52 bore and the diameter of the base of the 52 sabot - I feel that this might also effect flight time through the bore. Because of the diameter of the sabot base and the volume capacity of the bore - it offers a greater surface area for the pressure to push on which helps get it out quicker.
I was a bit surprised when I ran into the old 'Law of Deminishing Returns' with T7 so quickly. If you look at the velocities from 100 to 120 grains you can see that I constantly gained a percentage of velocity as I climbed the ladder, but at 130 grains it fell flat... literally shooting powder out the barrel.
When I switched over to BH and ran about the same testing I was a little surprised how the velocity dropped, but again realizing that BH is a 'progressive' burning powder - it just can not build the pressure before that light weight bullet is out the barrel, until I reached 130 grains, even them I doubt that I was burning the entire load.
I also believe I could run this same experiment with a 50 cal bore and come up with higher velocities from each of the powder loads.
Here is a picture of the target with the information embedded on the target.
Using 2100 fps as the velocity - the bullet will develope about 2150 #'s of energy and at 100 yards 1450#'s and at 200 yards it is about 1000#'s.
