reloading 300wm questions

gspman

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Sep 3, 2010
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I have just started reloading again after 25 years, So Iam esentially a newby again.
I have a rem700 xcr w/26in tube - 300 wm. I would like to start shooting LR in the future with this rifle as well as western big game.
Factory ammo grouped 1.25" to 2in and i was never happy with that.
I measured my chamber with a hornady O.A.L gauge and found it to be 2.968",
I measured a fire formed case and set up my sizer die (RCBS)to set the shoulder .002" back. Cases chamber in the rifle w/almost no bolt torque when camming over.

I seated the accubond 180 to 2.40...just sort enough to work thru the magazine reliably.
Started my loads at 71.5gn of H4831SC thru what my hornady book stated as a max load of 74.3gn.
I got a nice 3/8" grouping at 73 gns. My measured velocity is only avg 2860fps. avg dev of 12 fps over a 5 shot string.
Isn't this avg velocity low for that much powder? measured with my master chrony 10ft from the muzzle.
I have no signs of overpressure at all even after a 2nd reloading of the same load with same amount of powder.
If i decrease the jump to lands distance, will this increase my velocity? I know it should increase the pressure some?
Should just increase my powder charge until another sweat spot is found with out causing pressure signs?
I am not sure which direction I should follow at this point. I want this round to be right around 3000 fps to allow easier scope dialing.
Also i do not have any type of special crimping on the bullet. Just neck tension at this point. A buddy told i should put a roll crimp on and that will increase pressure and increase velocity??? t/f

Apoligies for the long post

Regards
gspman
 
Im not sure which way to tell you to go but I am getting 3050 with 75.5 grains seated at 3.490 with the same powder and bullets. Ryan
 
your results are exactly what i am looking for...

are you shooting a rem 700 as well, these long throats are just crazy, i would like to seat closer to the lands , but i feel i would a single shot rifle at that point.

I am very satisfied with a solid 3/8in group but its too slow.

I guess unless i find a different answer, i am going to continue bump the powder up and see when the pressure signs come on.

Thanks for your reply bigry26

gspman
 
I'm shooting a Rem. sendero 300 wm at the lands( 3.60) with 185 gr. VLD,
76 gr H-1000 @ 2914 fps.(thinking of bumping up volume-hopefully till 3000 fps)
I'm getting .35" grouping with 5 shots @ 200 yrds.
My shells fit/chamber in the magazine...Hope this helps some.
 
Also shooting the Berger 185gn Hunting VLD in my Savage 112BVSS. Pushing it ahead of 79.5gn of H1000 lit by a CCI250. I'm getting 3095fps with no pressure and it's consistently printing in .3-.4" range. I shot a 3" group at 500yds with it Saturday. This is not the best it's ever shot but I'll take it. JohnnyK.
 
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