I had 210 Bergers blow up in a 10 twist no freebore 300 Weatherby at 2930 in the middle of a match. The first two times was with between ten and 20 rounds through the chamber. I figured I must have hit a bird on the way to 1k when all ten didn't show up on the target. Then two matches later I had a guy spotting behind me during my relay and he saw round 9 come apart at around 100 yards. So I cleaned and put another 20 down after the match. Rounds 18 and 19 blew up. Only use them for woodchucks now.
I used 220 SMK for a year and went to the 210 matchkings this year. I have put a hundred or so through it and 35 rounds through it last Saturday, without cleaning, with the same charge and powder as my previous test. Performance similar to Berger. But no blowups.
I played alot with the 30-378 in factory mode. 200 gr Accubonds with 106gr of Retumbo was what it liked. I assumed they tolerated the jump better than others I tried.
Wow hoyt! that just dont make no scense I bet that ticked you off big time! I think the 210S are out of the picture for us, The 168s seem ok so far.
those jackets must be so sensitive, Too much, thanks for post
The best things in life cannot be seen or touched!
They must be felt with the heart.
Shummy, how would you compare the performance of the 210 Sierra to the 220 at 1000 so far? From its published BC, it looks somewhat disappointing. Are you finding it does better than the ballistic charts would predict?
This may be off the wall, but with that much freebore are there powders that would have ignition problems due to too low of a pressure? If the bullet has to move as far as you seem to indicate it would seem that some powders, especially in very cold conditions, might not maintain enough pressure to burn.
Drops are nearly interchangeable in my application. "My" BC for 220SMK is .601 and 210SMK is .590. Looks like 210 gives up 60lb energy and an inch in a 10wind at the speeds I ended up with. They shoot slightly better in my rifle.
For reference I figure a .551 for a 200gr Accubond. I can't relate this to any calculated BC, not changed based on speed but rather a single value that I use to shoot stuff from 100 to 1300 yards using a program that calculates very similar to Exbal.