Need some advise developing a load for my Suppressed Rifle.

Deja vu

New member
My paper work is in and my gun is due back in a few days from being threaded and having a faster twist barrel attached. but I am still looking at September (so I am told) before I will receive my suppressor because of the slow process.

So the question I have is this. I plan to develop some subsonic ammo for my gun, how much speed can i expect to add or loose from my bullet once I have the suppressor on the gun? I am shooting for a 500 grain 458 caliber bullet moving 1000-1050 FPS.

How much speed will a suppressor add or take away from the bullet? (best guess of course)
 
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