bullet seating depth

F

fatboyz

CGN Regular
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Just wondering what everyone's thoughts are on bullet seating depth with precision shooting? I'm shooting a remington Sendaro 7 mm Rem Mag with 160 gr partitions. I'm loading them at 3.10" which is .020 back from the lands. The Hornady manual lists a COL for the 7 mag at 2.90". I measured a factory Federal 175 gr round at 2.50"
How much does this kind of variance affect down range performance at say 500 yds?
 
It is more accurate to measure from the lands. Not sure what the 7s like but I think you are in the ballpark.
That's what load testing is all about. Try some at different COL and so some testing. Each gun has its own likes as far as distance from the lands.
 
3.10 is a little short I think.
Do this. Load a brass that you use and seat a bullet long. Say 3.4 OVL. No bullet and no primer. Then color the bullet black with a sharpie marker. Cycle the bullet in the action and then measure the length of the scratches that the lands put into the black marker. I usually load about .020 into the lands. Just keep on dialing your dies down until you get the desired length. Amax especially like to be jammed into the lands.

My Savage 7mmRM bullets are loaded 3.35 OVL.
 
Only a comprehensive comparison like a ladder test will tell you what seating depth your cocktail of components will like. Doing an accurate measurmeent of where your lands are is a good starting point. Start 80 thou back and poke them in 5 thou at a time.
 
MagnumPeanut said:
Stop giving practical advice.;)

No one wants to ladder test a 7mmRM. Too hard on the wallet and the shoulder.:sniper:
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Your're right. I forgot which forum I'm on, I'm sorry :( All it needs is a bipod and a cool looking scope. (Barska, Leapers, Simmons) It would be better if you switched the action to a Stevens and camouflaged it, but it will shoot quarter minute groups all day - guaranteed.
 
my experience with factory guns is that a nosler partition seated to touch the lands will not fit the mag. so unless you are only chambering one at a time you cannot get close to that seating depth. and if you are concerned about shooting long range a nos. part. has the bc of a rock?
Marc
 
Shockman
I have been trying to find a load it likes and so far the partition works pretty good. I'm not just punching paper so I want a hunting bullet. I wouldn't say 0.475 is a rock. I know everyone likes the VLD , but other than "best of the west" I don't know anyone who has actually shot anything with them. Any suggestions for a hunting bullet with a higher BC than the partition that has the proven performance on critters?
 
fatboyz said:
Shockman
I have been trying to find a load it likes and so far the partition works pretty good. I'm not just punching paper so I want a hunting bullet. I wouldn't say 0.475 is a rock. I know everyone likes the VLD , but other than "best of the west" I don't know anyone who has actually shot anything with them. Any suggestions for a hunting bullet with a higher BC than the partition that has the proven performance on critters?
Click to expand...


I would look at Swift Siroccos, They worked great for me on all the game i have taken at futher than normal range (400+) out of my 300WSM, and most of them have very good BC's. Not sure what they have to offer in the 7mm cal. it is on there website though.
 
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