[Fiftydriver]

Well,

Could be something as simple as your rifle just preferring the ULD RBBTs at longer ranges. This is THE reason why it is much better to test loads at longer ranges. At 100 yards, most loads look very good in a quality rifle. At farther ranges the personality of the loads and the rifles bullet preference come into play.

Getting a bit more involved, you say there was a slight crosswind. Remember the ULD RBBT will have a significantly higher BC value then the flat base bullet. This means it will buck the wind a bit better or should I say be less effected by the wind compared to the FB bullet.

Is this the reason you are seeing 1" groups with the ULD RBBT and are printing +5" groups, I doubt it.

More then likely this would be my opinion from looking at the targets, shoot more groups.....

One good group and one bad group means very little for determining a good load from a great load or even a bad load.

We have all pulled a shot here and there even if we hate to admit it. You take that third shot off the FB group and it looks alot better!! If by chance you saw that third shot fly and got a bit jumpy on the fourth shot as well, the group will go south quick. Rememeber your first two shots went into 3/4".

My advice, take an average of say five three shot groups and see which one performs best. You can get an idea that a load is a good one with one group but to prove its a good or bad load will take much more then one group, at least for me it does,

Both groups are noticably horizontal in shape. Any stock issues here contacting the barrel? Barrel heat can do some strange things, as can very slight barrel contact.

One other thing, are these two bullets made off the same jacket? If they are then you should not have any problems shooting them without cleaning in between. If they are different then you should always clean before testing another bullet.

I suspect that they are the same jacket but just checking.

All in all, do some more shooting. If you get an average of five three shot groups or whatever you want to shoot, you will have a much more meaningful idea of what the load will or won't do.

Good luck, keep us posted.

Kirby Allen(50)