i had a rum built and started shooting with new brass that was sized trimmed primer pockets cleaned in and out the cases were annealied. on my first firing they shot great and no pressure signs what so ever, i loaded up from starting load to max. accuracy in unreal. since then i loaded them again after full length sizing the case. this time they were tight and i even stuck a case in the chamber. i used a cleaning rod and removed in. i backed down my load and found a new load that worked good. works ok then starts sticking again. this has been continuing and i am now down 3.5 grain and i am still sticky. i am actually 3 greins under starting loads sticky once and awhile. my extraxtion cam is working on every case. my brother had a 300 rum built and we tried different powder and we are seeing the same results/ is ther something im missing on these big cases. maybe im expecting to much load ia 89.5gr retumbo 210 berger 215m primer 3083 fps does this seam right to you guys.
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problem with 300 rum
- Thread starter tjonh2001
- Start date
Re: problem with 300 rum
I believe given the information you have provided, that you are not properly full length resizing your cases. Have you verified that you are bumping the shoulder back at least .001"?
My thinking is that you aren't bumping the shoulder at all and have the die setup too high in your press.
I believe given the information you have provided, that you are not properly full length resizing your cases. Have you verified that you are bumping the shoulder back at least .001"?
My thinking is that you aren't bumping the shoulder at all and have the die setup too high in your press.
Re: problem with 300 rum
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hazardus</div><div class="ubbcode-body">I believe given the information you have provided, that you are not properly full length resizing your cases. Have you verified that you are bumping the shoulder back at least .001"?
My thinking is that you aren't bumping the shoulder at all and have the die setup too high in your press.</div></div>
This is a likely diagnosis from what I can tell.
A rep from Hornady once learned me something. Just cause the shellholder is hitting the die, that doesn't mean the case can't be run up further. I told him he was full of shit and he asked me to humor him while I had him on the phone. Low and behold, screw the die in an additional 1/2 turn and viola.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hazardus</div><div class="ubbcode-body">I believe given the information you have provided, that you are not properly full length resizing your cases. Have you verified that you are bumping the shoulder back at least .001"?
My thinking is that you aren't bumping the shoulder at all and have the die setup too high in your press.</div></div>
This is a likely diagnosis from what I can tell.
A rep from Hornady once learned me something. Just cause the shellholder is hitting the die, that doesn't mean the case can't be run up further. I told him he was full of shit and he asked me to humor him while I had him on the phone. Low and behold, screw the die in an additional 1/2 turn and viola.
Re: problem with 300 rum
Size one of your cases and try it in the rifle. If the bolt closes with resistance turn the FL die in 1/8 of a turn, re-size/re-try again. If the bolt still closes with resistance turn the die in another 1/8 and re-size/re-try. Continue this until the bolt closes smoothly on the sized brass. Do not turn the die in more than a 1/8 turn at a time.
Size one of your cases and try it in the rifle. If the bolt closes with resistance turn the FL die in 1/8 of a turn, re-size/re-try again. If the bolt still closes with resistance turn the die in another 1/8 and re-size/re-try. Continue this until the bolt closes smoothly on the sized brass. Do not turn the die in more than a 1/8 turn at a time.
Re: problem with 300 rum
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tjonh2001</div><div class="ubbcode-body">yeah i thought that but when i measure the shoulder i am actually bumping .003 back according to my case measurer. thats why this is so confusing </div></div>
The web of your case is still too large. Signs of an out of round or over sized chamber.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tjonh2001</div><div class="ubbcode-body">yeah i thought that but when i measure the shoulder i am actually bumping .003 back according to my case measurer. thats why this is so confusing </div></div>
The web of your case is still too large. Signs of an out of round or over sized chamber.
A
Augustus
Guest
Re: problem with 300 rum
tjon, your dies are not properly resizing your cases. Some dies will not size the body enough even if the shoulders are bumped properly. I am having the same problem with a 338/408 as we speak. If your chamber demensions are tighter than the die you can always use it for a fishing weight or something.
tjon, your dies are not properly resizing your cases. Some dies will not size the body enough even if the shoulders are bumped properly. I am having the same problem with a 338/408 as we speak. If your chamber demensions are tighter than the die you can always use it for a fishing weight or something.
A
Augustus
Guest
Re: problem with 300 rum
Are the dies sizing the cases .002 from head to shoulder. My dies were sufficiently sizing the cases at the juntion of the body and shoulder but not down near the head. The tightest place was about 3/8 above the head. If you look at your cases that have been fired several times and have become sticky, it should be easy to tell where the problem is by looking at the surface of the case.
Are the dies sizing the cases .002 from head to shoulder. My dies were sufficiently sizing the cases at the juntion of the body and shoulder but not down near the head. The tightest place was about 3/8 above the head. If you look at your cases that have been fired several times and have become sticky, it should be easy to tell where the problem is by looking at the surface of the case.
Re: problem with 300 rum
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wnroscoe</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tjonh2001</div><div class="ubbcode-body">yeah i thought that but when i measure the shoulder i am actually bumping .003 back according to my case measurer. thats why this is so confusing </div></div>
The web of your case is still too large. Signs of an out of round or over sized chamber.</div></div>
If the same builder did your brothers rifle this would really make sense.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wnroscoe</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tjonh2001</div><div class="ubbcode-body">yeah i thought that but when i measure the shoulder i am actually bumping .003 back according to my case measurer. thats why this is so confusing </div></div>
The web of your case is still too large. Signs of an out of round or over sized chamber.</div></div>
If the same builder did your brothers rifle this would really make sense.
