I have been experimenting with 'reduced recoil' load for my son's .270. Using SR 4759, I stepped up from 18gr to 30gr using a 110 gr. sierra spitzer. Several groups fired 4 shots in 1.25", several around 1", but at 21gr and 28 gr the groups got down in the .5" range. I'm thinking that for the lightest recoil with the best accuracy, I should load him up some 21grs. Maybe load the 28gr for small whitetails in the under 100 yd range.

Has anybody else found more than one sweetspot when working up a load? If so, do you usually choose the one with the highest velocity? Add or subtract half a grain to see if it tunes in a little better? I'm new to reloading so I'm trying to formulate a process for future load development.

In my experience, most loads have two sweet spots. The powder difference between the two, of course, vary from load to load, but I've never seen it be more than 1.5 grains.

Kory

truthfully, if you have a chronograph, you will find multiple sweetspots for a given bullet weight. The trick is to find the difference in velocity between sweetspots and then use that to plot your powder/ charge changes (within safe limits) Velocity is the key, changes in powder type will tune it further...

I have found more than one sweet spot on a particular load/bullet combo and usually use the fastest one as it will result in more "zap" in hunting and the grain or two less the other sweet spot would have would not result in much powder savings. Does the extra few fps reallymake a difference in hunting? Probably not, but it gives me more confidence in my load.

Having more than one spot meeans you found a fine bullet/combo and your dies work fine.Finding a consistant load is important,try 2X5 groups shots during two different days.Some guys here said rifles out of prodoction line without modifications wont shoot .5MOA,not all of them.Good reloading..

I'm way out past the edge of my knowledge here,
but I assumed there would be many sweet-spots
(nulls??), however only a few within a required
Vel range. Some good (even light) barrels arn't all that fussy and give hunting accuracy
all over. My good light one is also very short which probably helps.
JL.

With my 30'06 I found an accurate load with IMR4350, but it was with the minimum charge. I did not want to shoot that slow of an FPS so I tried another powder. With W760 the accurate load came with the max charge. So i went with the 760. I found two good accurate loads with the 760, so I went with the higher one because I wanted the speed.

I found the attached discussion one of the better explanations that I have heard for multiple sweet spots.
http://www.speakeasy.org/~cdlong/shock%20wave%20theory%20summary%20explanation.htm

Hey brassbender; thanks for that link.

I ran the numbers for my 6.5 x 55 BJAI loaded with 100 gr Nosler BT. It predicted a charge of 52.6 gr AA4350. I came up with 52.3 at the range (but 52.6 was about the same).

Spooky!

This could save a bunch of time in load development!