As with a number of other cartridges that make use of a belt to established headspace, new 7mm Remington Magnum circumstances and loaded cartridges in many cases are brief for the shoulder.

You’re appropriate. The hundreds were not tuned to an accuracy node for that check rifle. Right here’s what Patrick reported in the short article:

And IMR and Hodgdon are both of those owned by the identical organization, but H4350 and Varget are actually made by An additional corporation in Australia. For all I am aware, the IMR powders we tested had been produced in Romania … or exactly the same manufacturing facility in Australia. You absolutely shouldn’t believe that a little something will likely be related just given that they’re owned by exactly the same mum or dad corporation.

The good news is a shooting buddy has a fresh LabRadar and I very own a MagnetoSpeed and we're going to determine for ourselves this weekend. Yet again thank-you the get the job done you do.

Additionally they are formulated to get temperature insensitive, just like what we’ve observed with Hodgdon’s Serious number of powders.

I loaded Every single scenario at what I knew would be a mild to medium load, so as to stay clear of strain spikes. None of the loads ended up “tuned” for the imr 7977 in stock precise rifle we were screening with.

A fast Notice on the remark you built about H4350 and Varget. The rifle used had a 22″ barrel and this is why the velocities with Varget were being greater than that with H4350. Varget has the optimal melt away price for that barrel size. H4350 is better with 24-26″ barrel lengths as it is a little slower which is consequently a far better powder for the more time barrel.

Curiously could also not discover equation for your cylindrical rod by using a IMR 7977 cylindrical gap in middle and clamped at one conclude which would be an even better model for your absolutely free floating barrel.

At the very least with the powders analyzed the variation in the muzzle velocity SD with temperature was only some fps. Consequently not variable for many, if not all applications. Generally very good to turn a potential variable into a continuing. Completely realize your methodology didn't allow taking pictures for precision.

Some products might be flat-out Completely wrong nevertheless it is healthier to convey all designs are an approximation to truth. And that includes the fundamental legislation of physics.

The many powders stated Listed below are extruded. These “adhere” powders do not dispense from a powder measure fairly as exactly as spherical powders. I dropped ten charges of every powder from a measure and weighed them to view exactly how much weights diverse. The outcome follow:

Also did you evaluate the precision of your group considering that temperature has an imr 7977 in stock effect on numerous Bodily Qualities of steel?

So I loaded some 270WIN with IMR 7977 determined by a conservative H1000 demand and took them out and shot them.

Excellent work Cal. Could you notify me should you experienced 100% powder melt away inside the 22″ barrel? Also was the velocity depending on the Lab radar and confirmed with Magnedo, or common of both of those.