Most of the experimentation was done long ago, before the advent of all the new propellants that are now available.If we look at Somchem, the only gla...

The reason for heavy bullets is that lighter bullets need very small charges so as to not exceed the speed of sound. The extra weight of the bullet ne...

The reason for heavy bullets is that lighter bullets need very small charges so as to not exceed the speed of sound. The extra weight of the bullet ne...

S365 and the 270 can be a problem child at best. DaleSH (Gunsite) describes the effect as a "turbo boost" when pressures start to exceed 50 ...

Have a look at www.somchemreload.com

Trail boss has as equivalent VV N320 and MS200.

A rifle case with 3 grains of powder in it ?Software does not predict a SEE for you.Have a look at this data from Hodgon.

Twist rate might upset any plans of bullets heavier than 75gr in a 1 in 9 twist. Treeman should check that twist rate.

Herewith image I wanted to post.

Reduce that pressure to 1500psi and the calcs are there again. I am battling to post photos from my PC. How do I do that on this forum, as I only get ...

Herewith data with MP200. 3gr MP200 with 69gr Sierra Match King. Predicted speed 1130fps. You would need to fill the void with Dacron.What length is t...

The heavier the bullet the easier it is to get a speed below 1100fps. So a 70gr bullet should work well.

9mm Para. Anyting smaller in calibre has no stopping power.

Here is the QL calc. Max pressure for the 308 is given as 62K psi, but I leave my pressure at 60K as shown in the calc below. I have added 10fps for t...