Rem 700 Sendero 300 Rum bullet seating depth

T

toklat

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How critical it is as far as accuarcy to get the bullet seated .010 to .020 off the lands in this rifle. The problem is that i am loading 180 accubonds and i have to seat them about .100 off the lands in order for the shells to fit in the box magazine. Bottom line is the box mag isnt long enough. any suggestions?
 
Try shooting it single shot and see how it tunes further out.

It's been my observation it varies rifle to rifle, and more important, bullet shape to bullet shape.

I find that Sierra match kings are quite tolerant of a long jump, where bullets with longer ogives do not seem to self align as well.

I was never able to get 7mm accubonds to shoot well in a 7mm stw I was loading for. I was able to tune swift scirocco's much easier, and still get them in the magazine as well.
 
Accubond bullets

I've never been able to get an accubond bullet to be the most accurate hunting bullet during load development. The properties they have make me want to use them - but I struggle to get anything below 3/4 MOA.

In a couple of 300 RUM's I've found seating depth wasn't as big a deal as the bullet itself. Some worked far better than others.
 
In my Ruger .308 sporter I can't get them much closer than you can and have 'em repeat. I just loaded em to mag length and started tuning. I stopped with a stiff charge of RL 15 and the results are very very acceptable, often below .5 moa.

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I suggest you seat to the SAAMI OAL maximum for the cartridge. That will allow magazine feeding and might meet your accuracy criteria. Seating with clearance of .01 to .03, while recommended, does not necessarily yield best accuracy in a rifle. You can single load cartridges in the recommended clearance range and shoot them to see what, if any, improvement that yields. Some rifles have such long throats that it is impossible to seat nearly touching the rifling.
 
I have a couple 300 RUM's and believe that you will like the 200 gr. Accubonds. The 200 bullet has a different profile and I think you will get closer to the lands with the same overall length. Accuracy is excellent with this bullet at long range and I'm loading it to 3200+fps after a lot of powder trial.
 
Getting out to the lands.

Try Woodleigh 240g weldcores,they give superb accuracy in my Rem700 300Win Mag and if they wont get near the lands nothing else is going too as they are one long mother of a projectile. Incedently they reach the lands effortlessly in my rifle but shoot best about 3/16" off so good luck.
 
I've loaded for a Savage Model 12 300RUM and found that there was no gain by loading long and going single shot. Accuracy was just as good when seating the 180 Accubonds to magazine length. It was a long jump and that's probably as good as I can shoot the monster. Groups at 200 yards stayed consistent in the one to one and a quarter inch range. Of course that's just my experience. Others may be different.

As an aside I shot only one average sized doe with the 180 Accubond last year and wasn't all that pleased with the performance. The doe was hit picture perfect behind the shoulder broadside at 200 yards but still went probably 100 yards through pines with sparse blood trail. There was only a small caliber sized offside exit wound. Expansion evidently wasn't all that great. I'm not giving up on them though until I try a few more.
 
Seat your first shot to touch the lands......

seat the second to fit in the magazine....one shot...one kill.
 
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