idahohunter8
Beginner
- May 7, 2015
- 119
- 0
Was able to get out to the range today to shoot my new 375 H&H. I had it bedded by the gunsmith and wanted to see what she could do. All my loads were Hornady Brass, CCI 250 primers, RE-15, and 250 BARNES TTSX and 270 BARNES TSX.
With the 250's, I started at 72.0 grains to get sighted in and on paper at 100.
My next loads were at 73.0, 74.0, 75.0, 75.5, and 76.0.
My 270 grain loads were 72.0, 73.0, 74.0, 74.5, and 75.0
Accuracy wise, all the 250 grain loads were at an inch or under. The 270 grain loads like the lighter charges and opened up to about 1.4" on the 74.5 and 75.0 loads - But overall for a big bore - VERY PLEASED WITH ACCURACY.
All loads were seated to the last ring of the bullet. What perplexed me and is my reason for this post is the velocity readouts. Day was perfect for a chronograph so I don't think it was giving faulty readings.
250 Grains
73.0 - 2760 average
74.0- 2790 average
75.0 - 2810 average
75.5 - 2830 average - WARM
76.0 - 2860 average - HOT
270 Grains
72.0 - 2640 Average
73.0 - 2700 average
74.0 - 2740 average
74.5 - 2790 average
75.0 - 2810 average - Mildly warm but safe
So I have results showing a bullet weighing 20 grains more with nearly the same Velocities with far less pressure results. I probably could go to 76.0 on the 270's and push 2850 before getting too hot. I have NO ROOM left at all to push the 250's any faster. What gives? You would think the lighter bullet should be able to go faster than the heavier one?
With the 250's, I started at 72.0 grains to get sighted in and on paper at 100.
My next loads were at 73.0, 74.0, 75.0, 75.5, and 76.0.
My 270 grain loads were 72.0, 73.0, 74.0, 74.5, and 75.0
Accuracy wise, all the 250 grain loads were at an inch or under. The 270 grain loads like the lighter charges and opened up to about 1.4" on the 74.5 and 75.0 loads - But overall for a big bore - VERY PLEASED WITH ACCURACY.
All loads were seated to the last ring of the bullet. What perplexed me and is my reason for this post is the velocity readouts. Day was perfect for a chronograph so I don't think it was giving faulty readings.
250 Grains
73.0 - 2760 average
74.0- 2790 average
75.0 - 2810 average
75.5 - 2830 average - WARM
76.0 - 2860 average - HOT
270 Grains
72.0 - 2640 Average
73.0 - 2700 average
74.0 - 2740 average
74.5 - 2790 average
75.0 - 2810 average - Mildly warm but safe
So I have results showing a bullet weighing 20 grains more with nearly the same Velocities with far less pressure results. I probably could go to 76.0 on the 270's and push 2850 before getting too hot. I have NO ROOM left at all to push the 250's any faster. What gives? You would think the lighter bullet should be able to go faster than the heavier one?
