Strange trajectory for 270

Keep in mind that there's a 10% difference between yards/meters. 200 meters is the equivalent of 220 yards. Most reloading manuals are in yards. This still doesn't explain your variation though, but it may account for some of it. Also, is the 5" low at 200m the center of your group or the lowest hit? Likewise for the 100m group of course. You mention a 1.5" group at 100, which means your lowest shot could be 1.5" high at 100, not 2.5".
 
A-zone said:
Why don't you zero your load for 200 and see where it puts you at 100. You may be pleasantly surprised that it's not that bad.

Either way, it would be interesting to see what the POI is at 100 yards with a 200 yard zero.
Click to expand...

^^^
This was my thought, and to try it along side some factory loads to see if there is much difference in drop.
 
The surest way of testing your/any loads is with a chronograph. Five rounds will tell you everything.
When I sent in my story of how the modern H4831 I had was over a 100 fps slower than the old surplus H4831 I have, it was to point out that all the old classic loads with H4831 were all developed with the old surplus powder.
Therefore, the modern loadings took a 100 fps drop, right there.
The OP was using 57 grains of H4831, which is quite a light load.
Whether coincidence or not, my 1949 Husqvarna, wihich would be very similar, shoots about 100 fps slower, with the same load, as other 30-06 rifles I have compared it with. (This is no real problem, it just takes another grain or two of powder to bring it up to par.)
Taken all together, there could be a fairly slow bullet coming from his rifle.
I agree, though, not slow enough to account for the drastic drop.
Testing the rifle with factory loads will give more ideas, but not a possitive answer, because the factory loads could be as much as 300 fps slower than they are supposed to be.
Measuring the speed dwith a chronograph is the only sure way to know what is happening.
 
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