Amazing What Effect .001" Has On Chamber Pressure
Posted 06 May 2012 - 09:27 PM
Posted 07 May 2012 - 09:43 AM
Yeah, that exclusively would make one think there is likely something wrong.Great post and Pics... Thanks for Sharing
The fired brass brass is tight enough that it will hold the bullet snugly.
Posted 07 May 2012 - 11:16 AM
Posted 08 May 2012 - 05:09 PM
Posted 08 May 2012 - 07:41 PM
Posted 08 May 2012 - 07:41 PM
Posted 08 May 2012 - 10:40 PM
I bet. That definitely ain't supposed to be there! Good eyes too, I don't think I would have even noticed it with my eyes . And probably would have taken a decade to figure out actual problem. You must be loading pretty hot, or right on the edge. But seeing how it shoots, I wouldn't change a thing! Nice.
This was what baffled me during my load development because it only happened intermittently.
Posted 09 May 2012 - 03:55 AM
Posted 09 May 2012 - 05:00 AM
That is a classic sign of pressure getting up there - stiff bolt lift. It leaves those scrape marks.Usually a tight neck isn't a problem on factory produced rifles...but can be on a custom, where you can specify one if you like. If the neck are not turned to match they really clamp down on a chambered bullet and won't let go till the pressure really gets up there. If the difference is much more than you experienced bad things happen.
Tawnoper, The scraping was from the sharp edge of the ejector hole. The corner edge of the ejector hole get really sharp when Jim squares a bolt face.
Posted 09 May 2012 - 10:12 PM
One thing about Gruning rifles. It will shoot no matter what you feed them. This last range trip I shot 4 different load starting from 40.9, 41.2, 41.5 and 41.7 and they all clustered together.4 shots @110 yards3 shots5 shots @ 110 yards
But seeing how it shoots, I wouldn't change a thing! Nice.
Posted 10 May 2012 - 03:42 PM
Posted 11 May 2012 - 10:01 PM
Squeezing every ounce of Accuracy in a rifle take a lot of tedious work. The following illustration are some of the process.First is the use of a neck sizer die like the one on the picture to size the neck just enough just to hold the bullet.Then make sure the loaded cartridge will have no more than .002" out of round
I know a ton of effort goes into the science of your shooting, and it shows.
Posted 12 May 2012 - 05:40 AM
Posted 12 May 2012 - 07:43 AM
Posted 12 May 2012 - 08:29 AM
Posted 12 May 2012 - 10:43 PM
Yeah, because that's the easy part :smiley-outta-here:I couldn't imagine if reloading shotgun took that much effort!!! I'd probably never hunt again . That must be really nice living right down the road from WEGC though. I know it sure has to help for load development
I do these so that when it's my turn to shoot, all I have to worry is wind and my nerve.
Posted 15 May 2012 - 07:42 PM
5 shot group @110 yards
3 shot prone using bipod to check if there is any zero shift. There's no change in POI. I attribute that to the stability of the AI stock. The rifle is ready! Not sure about the shooter however.
Posted 01 August 2012 - 05:14 AM
Posted 01 August 2012 - 06:01 PM
Nice groups, Is the butt of the rifle in your shoulder when you shoot?
Your mean free recoil shooting? If so, then the answer is no. I don't do Benchrest.
Posted 01 August 2012 - 07:33 PM
I do like heavy guns. They're very forgiving and very stable to shoot. I've hunted with my 300 Win Mag Model 70 Laredo for a long time and it weigh a tad over twelve lbs.
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