195 grain 7mm Berger - How Much Cartridge Will it Need?

I am not real familiar with the 280's, but a quick look at some reloading info on line you could push them, but I don't think the 280 or ai version would be ideal. I have been running the 180 berger at 3170 and am hoping when the 195 decides to show its face i will be able to do 3050 or so out of the 7-300 win and if you ask broz what he would run those out of he will say the 7-300 win
 
On the other hand the G7 BC of .406 helps carry this bullet.

I crunched some JBM numbers for 4000 ft ( the elevation I usually shoot) with the bullet lumbering along at 2600 fps. It had 8.8 inches of drift at 500 yds in a 10 mph crosswind. That has it beating the wind drift of my 257 Weatherby with 110 accubonds going a bit over 3700 fps by 1.6". Energy is not great but it is just under 2000 ft/lb

At 975 yds it still is moving at 1903 fps which might be the threshold of reliable expansion. If 2000 fps is the borderline it is doing that at 825 yds.

If you were to build a long barrel with enough twist the 195 might do quite well. Sure you would be doing some turret twisting but you wouldn't have too many issues wind drift.

Who knows, with the right powder the 195 might even go 2700 fps or more from a 30" barrel and the 280 or 284 win.
 
Matrix claims that a 1:9 twist will work with the 190gr bullets, and when you plug the numbers into Berger's calculator a 195gr is plenty stabilized (over 2.0) out of a 1:9 at any altitude and I tried it down to 2600fps.
 
Matrix claims that a 1:9 twist will work with the 190gr bullets, and when you plug the numbers into Berger's calculator a 195gr is plenty stabilized (over 2.0) out of a 1:9 at any altitude and I tried it down to 2600fps.

I must need a new computer. I get a 1.32 SG at 3000 fps with a 9 inch twist. It takes a 7 inch twist for me to get the numbers you are getting.
 
So do you guys thin a 1:9 would stabilize it or would the twist have to be more aggressive than that?
No, you will need an 8.5 twist @ minium, probably a 1:8 would be ideal if that is the only bullet you plan on shooting.

However, keep in mind that this bullet has been talked aout for 2 years now, and we still haven't seen it. I'm not holding my breath, and I'll just stick to my 180's. LOL
 
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