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General >> Ammunition, reloading, shooting, etc >> A nice long range rifle with a sad life.
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Message started by Rapidrob on Nov 2nd, 2018 at 3:43pm

Title: Re: A nice long range rifle with a sad life.
Post by Rapidrob on Nov 7th, 2018 at 4:38am
The load I'm using this weekend is 40 grains of 7383 and a Remington magnum primer to see if the load shoots to the same spot.
With 40 grains the powder is slightly compressed. I tried 41 grains,which was more tightly compressed and the primer took on the face of the bolt and was almost completely flat. This is the characteristics of this powder when compressed more that just slightly the pressure will climb sharply in some bottleneck cartridges.
The rule of thumb with IMR-7383 is that you work up the load and keep checking the bore for unburnt powder grains. Once you find none, stop, and go no farther,you found the ideal charge with a given bullet.
As I posted earlier,  I bought the powder to load my magnum rifles. In particular I wanted the powder for my "mile rifle", a custom 8 MM Remington Magnum  with a 32" barrel firing a 220 grain Match King over 3,200 FPS . With today's triple based powders the charge weights were between 100 - 110 grains. No signs of pressure problems as the cartridge operates at 65-68,000 PSI.
With IMR-7383 I had to stop at 89 grains. The case was only 3/4 full but the pressures were getting excessive with the 220 grain bullets. Accuracy was good ,not great because of the low case density.
However, in the smaller over-bore cartridges,the powders works very well indeed. In the 6.5 Swede and the 7.5 Swiss with 160 and 175 grain bullets respectively accuracy is first rate in these rifles.( '91 Swede and M1911 Swiss)
The Dwell time for semi-auto rifles using gas pistons is a little long and I don't use it in them. Gas impingement as in the French 49/56, Swede AG42B, AR-10, AR-15 seem to like this powder and the brass last a long time.
For night time Hog Hunting or the like, this powder is ideal as there is no muzzle flash. A small,dull red glow is seen from a bystander.

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