Is there such a thing as min OAL or max bullet jump for a rifle with a long throat? , I usually try seating my bullets 0.030" - 0.040" from the lands or thereabouts but I do have a rifle with a very long throat and with some bullets the closest to the rifling I can get is 0.150". Is this too much jump to the rifling?

I am shooting a 300 savage bolt action and am limited by the short neck a bit. Id like to have base of the bullets seated close to the neck shoulder junction of the case since the neck of the case is so short, and I need to use what little there is to grip the bullet.

I bought a bunch of different 125 grain bullets hopeing to load them in this rifle for some light recoiling medium range varmint loads, and deer loads depending on the bullet. I had my heart set on loading them in this rifle but if I seat them deep enough in the neck to have a decent grip the jump will be at least 0.165" or so. Too much?

I am thinking some 170 gr flatpoints designed for 30-30 may allow me to have maximum grip in the neck area while still being relatively close to the rifling. Havent tested this yet since I have none on hand.

Seat the light bullets in the neck and dont wory about the jump. Neck tention is important to seal the gasses properly. My most accurate bullet is 110g sierra varminter in a .308w col 65mm at least 0.4i of the lands.

Lee claim that by using their factory crimp there is no need to get close to lands. Hope this helps.jc

Some combinations of short bullets in an infantry type cartridge throated for long heavy bullets may have .500 jump and that is with factory ammo.
1. The neck has to have enough grip to maintain assembly of the ammo.
2. It has to run through the magazine.
3. It has to clear the rifling so the round will chamber.
4. Then you check it for accuracy....

Thanks guys, just needed a little reassurance. Loaded some 125 grain ballistic tips up the other day and ended up 0.2 off the rifling, just waiting to get to the range to try em out. I seated the bullets so I had almost full bearing surface along the neck of the casing, and the boat tail protruding below the neck as to get the most contact between the neck of the case and the bullet. Tested a dummy round and it fed fine.

quote:

Originally posted by John Chalmers:
Lee claim that by using their factory crimp there is no need to get close to lands. Hope this helps.jc

Lee's claim is wrong in some instances. Getting close to the lands does two things:

1. It compensates to some extent for misalignment between the chamber and the bore.

2. It raises pressures which in some instances will improve powder ignition.

If the problem is #1 a Lee Factory Crimp Die will do nothing to improve accuracy in a firearm with a long throat.

I think Lee Factory Crimp dies are the very best way to crimp when you need to crimp but crimping in most cases doesn't improve accuracy.

Think Weatherby!!! roger