I tried out some 140gr NAB's in my 270 Win yesterday with good results.
For you guys loading this bullet, or any NAB's for that matter. Where do you seat the bullet in regards to the rifling/lands?
I have a Win M70 with a very shallow chamber. I'm just off the rifling at 3.205". I seated the bullet to 3.180" and got 1" groups.
I'm very pleased with this, but academically curious as to what the norm on seating depth is for this bullet.

Same question for Partitions. Do they like a 3-5 thousandth jump or to be just off???

Perry

The problem is every rifle is going to be different. I have used NAB's a lot and I don't think they are very particular about jump, at least in my .270's. I have used it in both .270 Weatherby and Winchester, and in my rifles I do not have to crowd the lands to get excellent accuracy. Sorry, I know this is not much help.

I find the 140 gr NAB to be a very good bullet in my 270 WSM Tikka. I seat them out as far as I can and still have reliable functioning from the magazine.Still well off the rifling

I only shoot 140gran Accubonds out of my two 270#.

I have killed a 210 pound follow deer (pre dressed weigh on a scale, 150 pound whitetail buck (gutted weight) two boars, a whitetail doe shot dead center between the eyes at 115 yards on the range finder, another doe dead center in the heart and through both shoulder blades as she fell, and a coyote.

All shots left massive, stick your hand through them exit wounds.

I seat mine at 3.227 which matches the average of the Winchester Black Box load. My Supergrade and Montana are under an inch for five shots at 100 yards. Yes, I said five. He Supergrade is marginally more accurate.

quote:

Originally posted by LHeym500:
I only shoot 140gran Accubonds out of my two 270#.

I have killed a 210 pound follow deer (pre dressed weigh on a scale, 150 pound whitetail buck (gutted weight) two boars, a whitetail doe shot dead center between the eyes at 115 yards on the range finder, another doe dead center in the heart and through both shoulder blades as she fell, and a coyote.

All shots left massive, stick your hand through them exit wounds.

I seat mine at 3.227 which matches the average of the Winchester Black Box load. My Supergrade and Montana are under an inch for five shots at 100 yards. Yes, I said five. He Supergrade is marginally more accurate.

What is your load, if you don't mind me asking?
I tried 52.5/Imr4350 that chrono'd at 2,875. 5 shots were .84 at 100 and just over 2.10" at 200 yards. Very pleasing results.
I also tried 53.5/Imr 4831 that chrono'd at 2,955 and grouped at 1.10" at 100. Also pleased.

Perry

When I get home tonight, I will pm you the specifics.

I've shot my .270 for 40 years with various bullets and now I only use the 140 NAB. 52 gr of IMR 4350, very good accuracy and DRT deer (OK, one made it about 10 ft but left a good blood trail). Remington brass and CCI 200 primers, seat the bullet to fit the magazine with a bit to spare, KISS, works for me.
Best.

I seat my 130 NAB to the base of the cartridge neck on both my 270 rifles. I use 55.1gr of H-4350 for both rifles and get 1.5" at 100 out of my Ruger No.1A (Hicks Accuracy device installed) and 1/2 inch at 200 with the bolt gun.

I've tried adjusting the seating depth and it didn't seem to make a difference on the No.1A. The other rifle is a bolt gun and it shoots great with anything that will fit the magazine.

I've always tried seating to the bottom of the neck with any bullet in any caliber I'm loading for. If that will not fit into the magazine or clip of a bolt gun then I seat it deeper until it does. May not be "the Right Way" to do things but has always worked well for me.

My load is actually 3.244 OAL with 57 grains of H4831SC.

I started with Reloader19, byput shifted to H4831SC because it is more temperature stable.

PM me. I will send you the targets.

Your 52.5 grain load of IMR 4350 books as a max load at 2858 from 24 inch barrels. So, you are doing well.

Every Accubond I've tried turns in identical velocity, trajectory, and accuracy as its counterpart Ballistic Tip, so I use the slightly less expensive Ballistic Tips to work up loads, then switch to the Accubond where it is more appropriate for hunting.

Pairs I've tried so far include the .30/150, .30/165, .30/180, and .338/200. I've used the .270/140, but only in the Ballistic Tip. With any of them, I strive for the closest to the lands that the magazine will allow. If the magazine allows the bullet to engage the lands, then I seat just deep enough to clear the lands. This is most often the best depth, but there are instances where certain rifles prefer a bit more jump. Only experimentation (which requires A LOT of shooting for typically minimal gain) will tell you the best depth for a particular gun. Of course, by the time you determine this you'll have about shot the barrel out and be ready to start over with a new one. So I just seat to the lands and call that "good" if the gun shoots well enough for whatever the task at hand.

Gentlemen, thank you all for the info!

Perry

If your getting one inch groups in a hunting rifle whatever your doing is correct..You can play with it now til hell freezes over, but your one inch groups can be your hunting loads until you stumble on something better. I have found the 200 gr. Nosler partition and the 200 gr. accubond usually shoot to the same POI..can't beat that. Ive had similar results with other calibers between equal weithts of partitions and Accubonds..