Thread: My first load development

Originally Posted by Remmodel7

@grandpamac.
Yes sorry 24” from adi book. From the top of my head I think max load was 2460fps so I'm guessing I should be in the high 2300?
Was hoping for better then that.
I had read that the Grendel being such a short case burns all it's powder and Max velocities can be reached from as little as a 14" barrel.
Ideally I want to use 8208 as my powder but as you will all know it's bloody hard to find anything at the moment. Or if you do in the car of powder get it to you.

Greetings Again Remmodel7,
Max was 27.5 grains of Benchmark for 2,460 fps. You are 0.5 grains below that. Calculating the velocity per grain using the start and max loads gives 94 fps per grain gives 47 fps loss. About the only cartridge that gives max velocity with a 14 inch barrel is the .22 Long Rifle RF so you will loose velocity from the 20 inch barrel. 4 inches at 20 fps per inch (a conservative estimate) gives another 80 fps loss gives a corrected velocity of around 2,330 fps for 27 grains and around 2,380 fps for 27.5 grains. Whoever said max velocities could be achieved in a 14 inch barrel must have a degree in wish full thinking. Only a chronograph will tell you the truth. If you want more velocity a lighter projectile would be needed. Around 2,400 fps with a 123 grain pill is a pretty decent load though.
Regards Grandpamac.

Originally Posted by grandpamac

Greetings Again Remmodel7,
Around 2,400 fps with a 123 grain pill is a pretty decent load though.
Regards Grandpamac.

yes its right up there with a 7.62x39mm LMFAO.......