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Post by elkman1310 on May 14, 2020 8:34:55 GMT -5
Well I had high hopes to see some good results last evening at 1K. conditions were good but for some strange reason the loads I put together were all to hot. I loaded the same 61.0 and 61.5grs of RL23 I shot the other day with no problems but boy did I have problems last evening. These Winchester cases have been fired several times the primer pockets was held up really well but they are expanding to much for good extraction. The primers were not cratered and there were no ejector marks at all on the cases but boy did they stick.
Today I want to measure my 7/300wsm reamer and my 300wsm reamer it seems like the 7/300wsm is undersize at the case head time will tell. Because normally by the time you run into pressure problems in a 300wsm case you will see ejector marks and the primer pocket will open up I am not seeing that with this 7/300wsm brass.
To end on a high note my heavy Dasher I built shot really small again. I tested to ten shot groups with two different seating pressures normally I want to the bullets to seat with a small amount of pressure when I seat the bullet in my Wilson straight line die and arbor press I had 13 loaded that way and then I had 13 loaded that seated considerably harder. I thought for sure the ones that seated the lightest would shoot best boy I was wrong. The lightest one shot 9 inches all vertical The hardest ones shot 4.9 inches with 9 in 3.75 inches that was pretty telling what this barrel wants. |
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Post by elkman1310 on May 14, 2020 12:26:31 GMT -5
I made a chamber cast of the Hart barrel I chambered first. I should have checked that right after I chambered it. This reamer I bought was a custom reamer and it is only .5545 at the .200 line it should be .5565. My bad! for not checking this out. The cases that came out hard in the 7/300wsm go right in and out in my 300wsm chamber which is the standard .5565 sometimes reamers are made smaller like this one to increase brass life but then you also reduce velocity.
Well go two choices shot only brass that is new or once fired or buy the right reamer and set the barrel back. Probably shot new brass for now to see if the 190gr bullets will actually shoot.
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Post by jims on May 15, 2020 19:27:51 GMT -5
Hope it all works out for you.
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Post by buckeye68 on May 16, 2020 5:17:35 GMT -5
Very interesting
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Post by elkman1310 on May 17, 2020 17:11:44 GMT -5
Well I took the barrel back off and polished the chamber again. This problem really didn't arise till I cleaned some of my brass with gray scotch bright. I have used it on all my brass and never had a problem till I did this particular chamber. The chamber was smooth but not smooth enough. So after polishing the chamber I polished my brass with 0000 steel wool and spun each one on my cordless drill using my PMA driver attachment.
I loaded up the same loads and went out and tested it today every case came out with no extraction problems or marks of any kind so I will need to pay more attention to the brass on this gun. The 190gr Berger has a long bearing surface and it does jack up more pressure that a 180gr VLD I am interested to see what happens when it get warmer the gun really wants to shoot.
Knowing what I know now I wish I would have chambered the barrel with my 7mm Weatherby reamer first it has the extra powder capacity to push the 190gr bullet easier. And if that did work out I would only have to cut the threads off the barrel and make it a WSM. But being that its a WSM I would have to loose 2 inches of barrel to get rid of the chamber that ain't going to happen.
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