If I get time Il do it today. Luckily the range is my front porch so I don't have far to go. Surely if I load some up and leave them in the freezer for an hour then take them out and shoot them immediately that should suffice?
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30 Sherman Magnum 20” Build
- Thread starter CA48
- Start date
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I put my rifle in the freezer also. But I can be nerdy. OCD afflicted.
I put 2 rounds in the freezer at 28* for 1.5 hours loaded with 92.5gr of LRT. Had the rifle muzzle set up in the A/C vent to cool the barrel down as well. Also it's 83* degrees today compared to 96* yesterday. Took the first round out of the freezer picked up the rifle and went outside and shot it within about 15 sec or less of pulling the round out of the freezer. Went back in and put the muzzle of the rifle in the ac vent for about 20-25 min then pulled the other round out of the freezer and repeated the process.
shot 1 2821
shot 2 2834
I'm going to estimate I was replicating shooting conditions of around 40* today compared to yesterday at 96*
That's a 56* drop in temp and a 133 drop in fps with the same load. Which comes out to 2.37 fps/ degree.
This is a small sample and vague test but enough to show that LRT is Temp Sensitive and loads should be adjusted between summer and winter temperatures.
Just for the heck of it I have 6 more rounds loaded with 92.5gr to test for accuracy at some point in the next few days.
shot 1 2821
shot 2 2834
I'm going to estimate I was replicating shooting conditions of around 40* today compared to yesterday at 96*
That's a 56* drop in temp and a 133 drop in fps with the same load. Which comes out to 2.37 fps/ degree.
This is a small sample and vague test but enough to show that LRT is Temp Sensitive and loads should be adjusted between summer and winter temperatures.
Just for the heck of it I have 6 more rounds loaded with 92.5gr to test for accuracy at some point in the next few days.
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Shot 92.5 of LRT at +.005" this evening, first 2 shots landed 0.8" at 100 yards. I stopped there and seated the next 2 at +.010" same charge. They grouped 1.0". Loaded up the last 2 at +.025 and they grouped 1.3". So nothing to good for the first 6 shots with LRT but it would need more testing. As I said earlier I'm sticking with the N570 load. Just had 6 pieces of 5x fired brass laying around that were ready to load so I gave it a quick try.
Glad to help get some data on LRT. Ive been curious about it myself for awhile now as I heard it was supposed to be less temp sensitive than other ball powders. I'm thinking I might try a few more loads closer to the lands before I put it back in the cabinet to see if I can tighten up groups.
We had a storm roll through Thursday so that evening things were pretty calm. Right about dark I decided to pull the rifle out and put three rounds down range on one of my steel plates. Distance was 1308 yards and the wind was 1mph @ 3cl. I dialed up 34.5 Moa and left the windage at 0. Fired 3 as fast as I could accurately as it was getting dark quick. The road to my target was a little wet still so I waited until the next day to go check it. In the pic my the bulleye looks strange because my target is one of those old school giant gooseneck hitches mounted on a 3x3 plate. The first 2 shots were 1.8" apart and landed on the edge of the ball at 5cl. The last shot hit on the center of the ball.
As pictured minus the bi-pod weight is 11.5lbs Although when I shot the group the rifle had a Terminator t-3 muzzle brake on. In that configuration the rifle weighs 10.4 lbs
As pictured minus the bi-pod weight is 11.5lbs Although when I shot the group the rifle had a Terminator t-3 muzzle brake on. In that configuration the rifle weighs 10.4 lbs
Excellent shooting! How does your accuracy fair going from the terminator brake to the supressor?
