How long is to long?

[PartsMan]

I was doing some measuring the other night.
The lands appear to be very deep in my 270.
I was using a dummy round with a split neck.
Putting the bullet any ware near the lands would make me over Nosler's max length with every bullet I have.

So far I have loaded exactly what the load stated.

[LaOtto222]

The stated OAL is a good place to start. Develop your best load by picking a likely powder and a bullet that will suit your need. Increase powder charges incrementally starting at the recommended minimums and working your way up, but do not exceed recommended maximums. Once you have found the most accurate load, then you can experiment with the bullet seating. If you can not find a load that shoots decently at the recommended OAL, seating the bullet out to the lands or close to them is not going to help that much. Start over with a different bullet or powder. You may find that the recommended OAL is best, you might find that .020 off of the lands is best, or some where in between. If you start getting close to the lands, you will need to back off your powder charge a little if you were near the max. if you get into the lands, you will need to back off about 5% - 10% if you were near max loads depending on the case you are loading for. I have found most guns shoot best off of the lands, but there are exceptions to every rule. There are a lot of factors that determine where your best accuracy is in relation to the lands. Many bench rest people tell you that kissing the lands or into the lands get you your best accuracy, but they have special cut chambers with tight necks and short throats that they must neck turn their cases for. They take extra care in case preparation and bullet seating too. Most production guns have loose necks so they can chamber factory loads from every manufacturer. Some cut extra long throats to purposely keep pressures down. This means in a majority of times that seating bullets off the lands yields your best accuracy. In some factory chambers, you will not be able to reach the lands at all or there is not enough bullet left in the neck to get good bullet tension. You will not know where the bullet should be until you try different OAL.

[beemanbeme]

In a lot of rifles, the magazine is gonna be the limiting factor.  The .300 Savage and .300 Win Mag are exceptions but the conventional wisdom is that you need a calibre of bullet in the neck for a proper hold on the bullet. That is to say, in your .270, you would need .277 of bullet in the neck of the case to properly hold it. 

[PartsMan]

In a lot of rifles, the magazine is gonna be the limiting factor.  The .300 Savage and .300 Win Mag are exceptions but the conventional wisdom is that you need a calibre of bullet in the neck for a proper hold on the bullet. That is to say, in your .270, you would need .277 of bullet in the neck of the case to properly hold it. 

The 150g Speer SP had the case neck full so It may work.
130g Accubond was barely in the neck.

[Catfish]

    As Beemanbeme said, conventional wisdom is 1 cal. in case. I have seated them far less with good results, but only for single shots or when loading 1 round at a time.
   The seating depth or jump to the land for best accuracy veries alot from gun to gun. I have had rifle that shot best with a jump over .050 and other that shot best with the bullet jamed into the rifleings. Each gun is different and you just need to keep tring things untill you get groups that your happy with.