someguy2800
Member
I had to chrono some loads this morning so I decided to do a quick test. The thermometer read -1 F so I wanted to see how temp sensitive H110 really is. I set my 357 and my 300 blackout AR and ammo outside for an hour while I did other things and then shot them over the chrono.
Unfortunately I did not have the angle right on the chrono to get some sun and none of the 3 rounds picked up.
Next the 4.2" 357 mag with a 125 grain Xtp, 21.5 grains of H110 (actually 296) in a starline case with fed SPM match primer. In 60 degree weather this averages right at 1500 fps.
1507
1475
1488
I also wanted to try 2400. I've considered this for hunting loads in 357 mag and maximum as I have read this is less temp sensitive. This is a 158 prvi HP with 15.4 gr 2400 and S&B sp primer and remington case. This averages 1260 fps at 60 degrees.
1221
1241
1189
Next my 38 special target load of 4 gr 700x with a 125 berrys fp with S&B primer. This averages 820 fps.
750
825
605 (felt noticeably softer)
So there ya go. It's a small test but results are results. I'm very suprized by the results. H110 was almost unaffected. 2400 was about what I expected. I didn't think 700x would make any difference but I could see it actually squibing if it was 20 degrees colder.
Unfortunately I did not have the angle right on the chrono to get some sun and none of the 3 rounds picked up.
Next the 4.2" 357 mag with a 125 grain Xtp, 21.5 grains of H110 (actually 296) in a starline case with fed SPM match primer. In 60 degree weather this averages right at 1500 fps.
1507
1475
1488
I also wanted to try 2400. I've considered this for hunting loads in 357 mag and maximum as I have read this is less temp sensitive. This is a 158 prvi HP with 15.4 gr 2400 and S&B sp primer and remington case. This averages 1260 fps at 60 degrees.
1221
1241
1189
Next my 38 special target load of 4 gr 700x with a 125 berrys fp with S&B primer. This averages 820 fps.
750
825
605 (felt noticeably softer)
So there ya go. It's a small test but results are results. I'm very suprized by the results. H110 was almost unaffected. 2400 was about what I expected. I didn't think 700x would make any difference but I could see it actually squibing if it was 20 degrees colder.